2:43 p.m.
Hi,
I'm at my wits end so I'm tossing this here in the hopes that SOMEONE
will be able to help me.
tl;dr: Ovirt is doing something on my network that is causing my fiber
modem to go from 3-5ms to 300-1000+ms round trip times. I know it's
ovirt because when I unplug ovirt from my network the issue goes away;
when I plug it back in, the issue recurs.
Long version:
I've been running Ovirt 4.0.6 happily on CentOS 7.3 for several months
on a single host machine. Indeed, the host had an uptime of 200+ days
and was working great until approximately midnight, September 21/22
(just over a week ago). I was on an airplane halfway across the
Atlantic at that time, so it wasn't anything I did.
My network is configured as:
fiber modem <-> edgerouter <-> switch <-> everything else
ovirt is living in the "everything else" area.
When I sit with a laptop connected to either the everything else range
or even directly connected to the fiber modem, I run 'mtr' and see
network times (starting at the fiber modem) that bounce all over the
place. When I unplug ovirt I see consistent 3-5ms times. Plug it back
in, voom, back up to badness.
I've spent several hours plugging and unplugging different devices
trying to isolate the issue. The only "device" that has any effect is
my ovirt box.
I have tried to debug this in several ways, but really the only thing
that seems to have helped at all is shutting down all the VMs and the
hosted engine. Once nothing else is running (but the host itself), only
then does the network seem to return to normal.
I'm really at my wits end on this; I have no idea what is causing this
or what might have changed to cause the issue right at that time. I
also can't imagine what ovirt is doing over the network that could cause
the modem, two physical hops away, to lose its mind in this way. But my
experiementation is definitely showing a direct correlation.
Help!!
-derek
--
Derek Atkins 617-623-3745
derek(a)ihtfp.com www.ihtfp.com
Computer and Internet Security Consultant
5:34 p.m.
Hi
We saw something very similar to this a couple of years ago. In our case,
it was caused by STP being enabled on our hypervisors.
HTH
On 3 Oct. 2017 04:56, "Derek Atkins" <derek(a)ihtfp.com> wrote:
Hi,
I'm at my wits end so I'm tossing this here in the hopes that SOMEONE
will be able to help me.
tl;dr: Ovirt is doing something on my network that is causing my fiber
modem to go from 3-5ms to 300-1000+ms round trip times. I know it's
ovirt because when I unplug ovirt from my network the issue goes away;
when I plug it back in, the issue recurs.
Long version:
I've been running Ovirt 4.0.6 happily on CentOS 7.3 for several months
on a single host machine. Indeed, the host had an uptime of 200+ days
and was working great until approximately midnight, September 21/22
(just over a week ago). I was on an airplane halfway across the
Atlantic at that time, so it wasn't anything I did.
My network is configured as:
fiber modem <-> edgerouter <-> switch <-> everything else
ovirt is living in the "everything else" area.
When I sit with a laptop connected to either the everything else range
or even directly connected to the fiber modem, I run 'mtr' and see
network times (starting at the fiber modem) that bounce all over the
place. When I unplug ovirt I see consistent 3-5ms times. Plug it back
in, voom, back up to badness.
I've spent several hours plugging and unplugging different devices
trying to isolate the issue. The only "device" that has any effect is
my ovirt box.
I have tried to debug this in several ways, but really the only thing
that seems to have helped at all is shutting down all the VMs and the
hosted engine. Once nothing else is running (but the host itself), only
then does the network seem to return to normal.
I'm really at my wits end on this; I have no idea what is causing this
or what might have changed to cause the issue right at that time. I
also can't imagine what ovirt is doing over the network that could cause
the modem, two physical hops away, to lose its mind in this way. But my
experiementation is definitely showing a direct correlation.
Help!!
-derek
--
Derek Atkins 617-623-3745 <(617)%20623-3745>
derek(a)ihtfp.com www.ihtfp.com
Computer and Internet Security Consultant
_______________________________________________
Users mailing list
Users(a)ovirt.org
http://lists.ovirt.org/mailman/listinfo/users
5:11 a.m.
This is a multi-part message in MIME format.
------------15ee1ee8ffd6c4a27ea4374613
Content-Type: text/plain; format=flowed; charset="UTF-8"
Content-Transfer-Encoding: 8bit
I'm sorry. What is STP?
And how do I turn that off?
-derek
Sent using my mobile device. Please excuse any typos.
On October 2, 2017 7:41:15 PM Colin Coe <colin.coe(a)gmail.com> wrote:
Hi
We saw something very similar to this a couple of years ago. In our case,
it was caused by STP being enabled on our hypervisors.
HTH
On 3 Oct. 2017 04:56, "Derek Atkins" <derek(a)ihtfp.com> wrote:
> Hi,
>
> I'm at my wits end so I'm tossing this here in the hopes that SOMEONE
> will be able to help me.
>
> tl;dr: Ovirt is doing something on my network that is causing my fiber
> modem to go from 3-5ms to 300-1000+ms round trip times. I know it's
> ovirt because when I unplug ovirt from my network the issue goes away;
> when I plug it back in, the issue recurs.
>
> Long version:
>
> I've been running Ovirt 4.0.6 happily on CentOS 7.3 for several months
> on a single host machine. Indeed, the host had an uptime of 200+ days
> and was working great until approximately midnight, September 21/22
> (just over a week ago). I was on an airplane halfway across the
> Atlantic at that time, so it wasn't anything I did.
>
> My network is configured as:
>
> fiber modem <-> edgerouter <-> switch <-> everything else
>
> ovirt is living in the "everything else" area.
>
> When I sit with a laptop connected to either the everything else range
> or even directly connected to the fiber modem, I run 'mtr' and see
> network times (starting at the fiber modem) that bounce all over the
> place. When I unplug ovirt I see consistent 3-5ms times. Plug it back
> in, voom, back up to badness.
>
> I've spent several hours plugging and unplugging different devices
> trying to isolate the issue. The only "device" that has any effect is
> my ovirt box.
>
> I have tried to debug this in several ways, but really the only thing
> that seems to have helped at all is shutting down all the VMs and the
> hosted engine. Once nothing else is running (but the host itself), only
> then does the network seem to return to normal.
>
> I'm really at my wits end on this; I have no idea what is causing this
> or what might have changed to cause the issue right at that time. I
> also can't imagine what ovirt is doing over the network that could cause
> the modem, two physical hops away, to lose its mind in this way. But my
> experiementation is definitely showing a direct correlation.
>
> Help!!
>
> -derek
>
> --
> Derek Atkins 617-623-3745 <(617)%20623-3745>
> derek(a)ihtfp.com www.ihtfp.com
> Computer and Internet Security Consultant
> _______________________________________________
> Users mailing list
> Users(a)ovirt.org
> http://lists.ovirt.org/mailman/listinfo/users
>
------------15ee1ee8ffd6c4a27ea4374613
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: 8bit
<html>
<head>
</head>
<body>
<div style="color: black;">
<div style="color: black;">
<p style="margin: 0 0 1em 0; color: black;">I'm sorry. What is STP?
<br>
And how do I turn that off? </p>
<p style="margin: 0 0 1em 0; color: black;">-derek<br>
Sent using my mobile device. Please excuse any typos. <br>
</p>
</div>
<div style="color: black;">
<p
style="color: black; font-size: 10pt; font-family: Arial, sans-serif; margin: 10pt
0;">On
October 2, 2017 7:41:15 PM Colin Coe &lt;colin.coe(a)gmail.com&gt; wrote:</p>
<blockquote type="cite" class="gmail_quote"
style="margin: 0 0 0 0.75ex; border-left: 1px solid #808080; padding-left:
0.75ex;">
<div dir="ltr"><div dir="auto"></div><div
class="gmail_extra">Hi</div><div
class="gmail_extra"><br></div><div
class="gmail_extra">We saw something
very similar to this a couple of years ago. In our case, it was caused by
STP being enabled on our hypervisors.</div><div
class="gmail_extra"><br></div><div
class="gmail_extra">HTH</div><div
class="gmail_extra"><br></div><div
class="gmail_extra"><br></div><div
class="gmail_extra"><br><div class="gmail_quote">On 3
Oct. 2017 04:56,
"Derek Atkins" <<a href="mailto:derek@ihtfp.com"
target="_blank">derek(a)ihtfp.com</a>&gt; wrote:<br
type="attribution"><blockquote class="gmail_quote"
style="margin:0 0 0 .8ex;border-left:1px #ccc
solid;padding-left:1ex">Hi,<br>
<br>
I'm at my wits end so I'm tossing this here in the hopes that
SOMEONE<br>
will be able to help me.<br>
<br>
tl;dr: Ovirt is doing something on my network that is causing my fiber<br>
modem to go from 3-5ms to 300-1000+ms round trip times. I know it's<br>
ovirt because when I unplug ovirt from my network the issue goes away;<br>
when I plug it back in, the issue recurs.<br>
<br>
Long version:<br>
<br>
I've been running Ovirt 4.0.6 happily on CentOS 7.3 for several months<br>
on a single host machine. Indeed, the host had an uptime of 200+ days<br>
and was working great until approximately midnight, September 21/22<br>
(just over a week ago). I was on an airplane halfway across the<br>
Atlantic at that time, so it wasn't anything I did.<br>
<br>
My network is configured as:<br>
<br>
fiber modem <-> edgerouter <-> switch <->
everything
else<br>
<br>
ovirt is living in the "everything else" area.<br>
<br>
When I sit with a laptop connected to either the everything else range<br>
or even directly connected to the fiber modem, I run 'mtr' and
see<br>
network times (starting at the fiber modem) that bounce all over the<br>
place. When I unplug ovirt I see consistent 3-5ms times. Plug it back<br>
in, voom, back up to badness.<br>
<br>
I've spent several hours plugging and unplugging different devices<br>
trying to isolate the issue. The only "device" that has any
effect is<br>
my ovirt box.<br>
<br>
I have tried to debug this in several ways, but really the only thing<br>
that seems to have helped at all is shutting down all the VMs and the<br>
hosted engine. Once nothing else is running (but the host itself), only<br>
then does the network seem to return to normal.<br>
<br>
I'm really at my wits end on this; I have no idea what is causing this<br>
or what might have changed to cause the issue right at that time. I<br>
also can't imagine what ovirt is doing over the network that could
cause<br>
the modem, two physical hops away, to lose its mind in this way. But my<br>
experiementation is definitely showing a direct correlation.<br>
<br>
Help!!<br>
<br>
-derek<br>
<br>
--<br>
Derek Atkins <a href="tel:(617)%20623-3745"
value="+16176233745"
target="_blank">617-623-3745</a><br>
<a href="mailto:derek@ihtfp.com"
target="_blank">derek(a)ihtfp.com</a> <a
href="http://www.ihtfp.com" rel="noreferrer"
target="_blank">www.ihtfp.com</a><br>
Computer and Internet Security Consultant<br>
______________________________<wbr>_________________<br>
Users mailing list<br>
<a href="mailto:Users@ovirt.org"
target="_blank">Users(a)ovirt.org</a><br>
<a href="http://lists.ovirt.org/mailman/listinfo/users"
rel="noreferrer"
target="_blank">http://lists.ovirt.org/mailman<wbr>/li...
</blockquote></div></div>
</div>
</blockquote>
</div>
</div>
</body>
</html>
------------15ee1ee8ffd6c4a27ea4374613--
5:13 a.m.
This is a multi-part message in MIME format.
------------15ee1f115816c4a27ea5c0165e
Content-Type: text/plain; format=flowed; charset="UTF-8"
Content-Transfer-Encoding: 8bit
Do you mean spanning tree protocol?
I'm not sure how that could cross a router boundary, but it is something to
look into..
-derek
Sent using my mobile device. Please excuse any typos.
On October 3, 2017 7:12:00 AM Derek Atkins <derek(a)ihtfp.com> wrote:
I'm sorry. What is STP?
And how do I turn that off?
-derek
Sent using my mobile device. Please excuse any typos.
On October 2, 2017 7:41:15 PM Colin Coe <colin.coe(a)gmail.com> wrote:
> Hi
>
> We saw something very similar to this a couple of years ago. In our case,
> it was caused by STP being enabled on our hypervisors.
>
> HTH
>
>
>
> On 3 Oct. 2017 04:56, "Derek Atkins" <derek(a)ihtfp.com> wrote:
>
>> Hi,
>>
>> I'm at my wits end so I'm tossing this here in the hopes that SOMEONE
>> will be able to help me.
>>
>> tl;dr: Ovirt is doing something on my network that is causing my fiber
>> modem to go from 3-5ms to 300-1000+ms round trip times. I know it's
>> ovirt because when I unplug ovirt from my network the issue goes away;
>> when I plug it back in, the issue recurs.
>>
>> Long version:
>>
>> I've been running Ovirt 4.0.6 happily on CentOS 7.3 for several months
>> on a single host machine. Indeed, the host had an uptime of 200+ days
>> and was working great until approximately midnight, September 21/22
>> (just over a week ago). I was on an airplane halfway across the
>> Atlantic at that time, so it wasn't anything I did.
>>
>> My network is configured as:
>>
>> fiber modem <-> edgerouter <-> switch <-> everything else
>>
>> ovirt is living in the "everything else" area.
>>
>> When I sit with a laptop connected to either the everything else range
>> or even directly connected to the fiber modem, I run 'mtr' and see
>> network times (starting at the fiber modem) that bounce all over the
>> place. When I unplug ovirt I see consistent 3-5ms times. Plug it back
>> in, voom, back up to badness.
>>
>> I've spent several hours plugging and unplugging different devices
>> trying to isolate the issue. The only "device" that has any effect is
>> my ovirt box.
>>
>> I have tried to debug this in several ways, but really the only thing
>> that seems to have helped at all is shutting down all the VMs and the
>> hosted engine. Once nothing else is running (but the host itself), only
>> then does the network seem to return to normal.
>>
>> I'm really at my wits end on this; I have no idea what is causing this
>> or what might have changed to cause the issue right at that time. I
>> also can't imagine what ovirt is doing over the network that could cause
>> the modem, two physical hops away, to lose its mind in this way. But my
>> experiementation is definitely showing a direct correlation.
>>
>> Help!!
>>
>> -derek
>>
>> --
>> Derek Atkins 617-623-3745 <(617)%20623-3745>
>> derek(a)ihtfp.com www.ihtfp.com
>> Computer and Internet Security Consultant
>> _______________________________________________
>> Users mailing list
>> Users(a)ovirt.org
>> http://lists.ovirt.org/mailman/listinfo/users
>>
----------
_______________________________________________
Users mailing list
Users(a)ovirt.org
http://lists.ovirt.org/mailman/listinfo/users
------------15ee1f115816c4a27ea5c0165e
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: 8bit
<html>
<head>
</head>
<body>
<div style="color: black;">
<div style="color: black;">
<p style="margin: 0 0 1em 0; color: black;">Do you mean spanning tree
protocol? <br>
I'm not sure how that could cross a router boundary, but it is something to
look into.. </p>
<p style="margin: 0 0 1em 0; color: black;">-derek<br>
Sent using my mobile device. Please excuse any typos. <br>
</p>
</div>
<div style="color: black;">
<p
style="color: black; font-size: 10pt; font-family: Arial, sans-serif; margin: 10pt
0;">On
October 3, 2017 7:12:00 AM Derek Atkins &lt;derek(a)ihtfp.com&gt; wrote:</p>
<blockquote type="cite" class="gmail_quote"
style="margin: 0 0 0 0.75ex; border-left: 1px solid #808080; padding-left:
0.75ex;">
<div style="color: black;">
<div style="color: black;">
<p style="margin: 0 0 1em 0; color: black;">I'm sorry. What is STP?
<br>
And how do I turn that off? </p>
<p style="margin: 0 0 1em 0; color: black;">-derek<br>
Sent using my mobile device. Please excuse any typos. <br>
</p>
</div>
<div style="color: black;">
<p
style="color: black; font-size: 10pt; font-family: Arial, sans-serif; margin: 10pt
0;">On
October 2, 2017 7:41:15 PM Colin Coe &lt;colin.coe(a)gmail.com&gt; wrote:</p>
<blockquote type="cite" class="gmail_quote"
style="margin: 0 0 0 0.75ex; border-left: 1px solid #808080; padding-left:
0.75ex;">
<div dir="ltr"><div dir="auto"></div><div
class="gmail_extra">Hi</div><div
class="gmail_extra"><br></div><div
class="gmail_extra">We saw something
very similar to this a couple of years ago. In our case, it was caused by
STP being enabled on our hypervisors.</div><div
class="gmail_extra"><br></div><div
class="gmail_extra">HTH</div><div
class="gmail_extra"><br></div><div
class="gmail_extra"><br></div><div
class="gmail_extra"><br><div class="gmail_quote">On 3
Oct. 2017 04:56,
"Derek Atkins" <<a href="mailto:derek@ihtfp.com"
target="_blank">derek(a)ihtfp.com</a>&gt; wrote:<br
type="attribution"><blockquote class="gmail_quote"
style="margin:0 0 0 .8ex;border-left:1px #ccc
solid;padding-left:1ex">Hi,<br>
<br>
I'm at my wits end so I'm tossing this here in the hopes that
SOMEONE<br>
will be able to help me.<br>
<br>
tl;dr: Ovirt is doing something on my network that is causing my fiber<br>
modem to go from 3-5ms to 300-1000+ms round trip times. I know it's<br>
ovirt because when I unplug ovirt from my network the issue goes away;<br>
when I plug it back in, the issue recurs.<br>
<br>
Long version:<br>
<br>
I've been running Ovirt 4.0.6 happily on CentOS 7.3 for several months<br>
on a single host machine. Indeed, the host had an uptime of 200+ days<br>
and was working great until approximately midnight, September 21/22<br>
(just over a week ago). I was on an airplane halfway across the<br>
Atlantic at that time, so it wasn't anything I did.<br>
<br>
My network is configured as:<br>
<br>
fiber modem <-> edgerouter <-> switch <->
everything
else<br>
<br>
ovirt is living in the "everything else" area.<br>
<br>
When I sit with a laptop connected to either the everything else range<br>
or even directly connected to the fiber modem, I run 'mtr' and
see<br>
network times (starting at the fiber modem) that bounce all over the<br>
place. When I unplug ovirt I see consistent 3-5ms times. Plug it back<br>
in, voom, back up to badness.<br>
<br>
I've spent several hours plugging and unplugging different devices<br>
trying to isolate the issue. The only "device" that has any
effect is<br>
my ovirt box.<br>
<br>
I have tried to debug this in several ways, but really the only thing<br>
that seems to have helped at all is shutting down all the VMs and the<br>
hosted engine. Once nothing else is running (but the host itself), only<br>
then does the network seem to return to normal.<br>
<br>
I'm really at my wits end on this; I have no idea what is causing this<br>
or what might have changed to cause the issue right at that time. I<br>
also can't imagine what ovirt is doing over the network that could
cause<br>
the modem, two physical hops away, to lose its mind in this way. But my<br>
experiementation is definitely showing a direct correlation.<br>
<br>
Help!!<br>
<br>
-derek<br>
<br>
--<br>
Derek Atkins <a href="tel:(617)%20623-3745"
value="+16176233745"
target="_blank">617-623-3745</a><br>
<a href="mailto:derek@ihtfp.com"
target="_blank">derek(a)ihtfp.com</a> <a
href="http://www.ihtfp.com" rel="noreferrer"
target="_blank">www.ihtfp.com</a><br>
Computer and Internet Security Consultant<br>
______________________________<wbr>_________________<br>
Users mailing list<br>
<a href="mailto:Users@ovirt.org"
target="_blank">Users(a)ovirt.org</a><br>
<a href="http://lists.ovirt.org/mailman/listinfo/users"
rel="noreferrer"
target="_blank">http://lists.ovirt.org/mailman<wbr>/li...
</blockquote></div></div>
</div>
</blockquote>
</div>
</div>
_______________________________________________<br>
Users mailing list<br>
<a class="aqm-autolink aqm-autowrap"
href="mailto:Users%40ovirt.org">Users@ovirt.org</a><br>
<a class="aqm-autolink aqm-autowrap"
href="http://lists.ovirt.org/mailman/listinfo/users">http://...
<br></blockquote>
</div>
</div>
</body>
</html>
------------15ee1f115816c4a27ea5c0165e--
5:15 a.m.
Spanning Tree Protocol.
Make sure the /etc/sysconfig/network-scripts/ifcfg-eth0 (or whatever) does
not have an STP=yes line.
CC
On 3 Oct. 2017 19:11, "Derek Atkins" <derek(a)ihtfp.com> wrote:
I'm sorry. What is STP?
And how do I turn that off?
-derek
Sent using my mobile device. Please excuse any typos.
On October 2, 2017 7:41:15 PM Colin Coe <colin.coe(a)gmail.com> wrote:
> Hi
>
> We saw something very similar to this a couple of years ago. In our
> case, it was caused by STP being enabled on our hypervisors.
>
> HTH
>
>
>
> On 3 Oct. 2017 04:56, "Derek Atkins" <derek(a)ihtfp.com> wrote:
>
>> Hi,
>>
>> I'm at my wits end so I'm tossing this here in the hopes that SOMEONE
>> will be able to help me.
>>
>> tl;dr: Ovirt is doing something on my network that is causing my fiber
>> modem to go from 3-5ms to 300-1000+ms round trip times. I know it's
>> ovirt because when I unplug ovirt from my network the issue goes away;
>> when I plug it back in, the issue recurs.
>>
>> Long version:
>>
>> I've been running Ovirt 4.0.6 happily on CentOS 7.3 for several months
>> on a single host machine. Indeed, the host had an uptime of 200+ days
>> and was working great until approximately midnight, September 21/22
>> (just over a week ago). I was on an airplane halfway across the
>> Atlantic at that time, so it wasn't anything I did.
>>
>> My network is configured as:
>>
>> fiber modem <-> edgerouter <-> switch <-> everything else
>>
>> ovirt is living in the "everything else" area.
>>
>> When I sit with a laptop connected to either the everything else range
>> or even directly connected to the fiber modem, I run 'mtr' and see
>> network times (starting at the fiber modem) that bounce all over the
>> place. When I unplug ovirt I see consistent 3-5ms times. Plug it back
>> in, voom, back up to badness.
>>
>> I've spent several hours plugging and unplugging different devices
>> trying to isolate the issue. The only "device" that has any effect is
>> my ovirt box.
>>
>> I have tried to debug this in several ways, but really the only thing
>> that seems to have helped at all is shutting down all the VMs and the
>> hosted engine. Once nothing else is running (but the host itself), only
>> then does the network seem to return to normal.
>>
>> I'm really at my wits end on this; I have no idea what is causing this
>> or what might have changed to cause the issue right at that time. I
>> also can't imagine what ovirt is doing over the network that could cause
>> the modem, two physical hops away, to lose its mind in this way. But my
>> experiementation is definitely showing a direct correlation.
>>
>> Help!!
>>
>> -derek
>>
>> --
>> Derek Atkins 617-623-3745 <(617)%20623-3745>
>> derek(a)ihtfp.com www.ihtfp.com
>> Computer and Internet Security Consultant
>> _______________________________________________
>> Users mailing list
>> Users(a)ovirt.org
>> http://lists.ovirt.org/mailman/listinfo/users
>>
>
5:19 a.m.
This is a multi-part message in MIME format.
------------15ee1f64bf56c4a27ea22b7738
Content-Type: text/plain; format=flowed; charset="UTF-8"
Content-Transfer-Encoding: 8bit
On the host or in the guests?
-derek
Sent using my mobile device. Please excuse any typos.
On October 3, 2017 7:15:35 AM Colin Coe <colin.coe(a)gmail.com> wrote:
Spanning Tree Protocol.
Make sure the /etc/sysconfig/network-scripts/ifcfg-eth0 (or whatever) does
not have an STP=yes line.
CC
On 3 Oct. 2017 19:11, "Derek Atkins" <derek(a)ihtfp.com> wrote:
> I'm sorry. What is STP?
> And how do I turn that off?
>
> -derek
> Sent using my mobile device. Please excuse any typos.
>
> On October 2, 2017 7:41:15 PM Colin Coe <colin.coe(a)gmail.com> wrote:
>
>> Hi
>>
>> We saw something very similar to this a couple of years ago. In our
>> case, it was caused by STP being enabled on our hypervisors.
>>
>> HTH
>>
>>
>>
>> On 3 Oct. 2017 04:56, "Derek Atkins" <derek(a)ihtfp.com> wrote:
>>
>>> Hi,
>>>
>>> I'm at my wits end so I'm tossing this here in the hopes that
SOMEONE
>>> will be able to help me.
>>>
>>> tl;dr: Ovirt is doing something on my network that is causing my fiber
>>> modem to go from 3-5ms to 300-1000+ms round trip times. I know it's
>>> ovirt because when I unplug ovirt from my network the issue goes away;
>>> when I plug it back in, the issue recurs.
>>>
>>> Long version:
>>>
>>> I've been running Ovirt 4.0.6 happily on CentOS 7.3 for several months
>>> on a single host machine. Indeed, the host had an uptime of 200+ days
>>> and was working great until approximately midnight, September 21/22
>>> (just over a week ago). I was on an airplane halfway across the
>>> Atlantic at that time, so it wasn't anything I did.
>>>
>>> My network is configured as:
>>>
>>> fiber modem <-> edgerouter <-> switch <-> everything
else
>>>
>>> ovirt is living in the "everything else" area.
>>>
>>> When I sit with a laptop connected to either the everything else range
>>> or even directly connected to the fiber modem, I run 'mtr' and see
>>> network times (starting at the fiber modem) that bounce all over the
>>> place. When I unplug ovirt I see consistent 3-5ms times. Plug it back
>>> in, voom, back up to badness.
>>>
>>> I've spent several hours plugging and unplugging different devices
>>> trying to isolate the issue. The only "device" that has any effect
is
>>> my ovirt box.
>>>
>>> I have tried to debug this in several ways, but really the only thing
>>> that seems to have helped at all is shutting down all the VMs and the
>>> hosted engine. Once nothing else is running (but the host itself), only
>>> then does the network seem to return to normal.
>>>
>>> I'm really at my wits end on this; I have no idea what is causing this
>>> or what might have changed to cause the issue right at that time. I
>>> also can't imagine what ovirt is doing over the network that could cause
>>> the modem, two physical hops away, to lose its mind in this way. But my
>>> experiementation is definitely showing a direct correlation.
>>>
>>> Help!!
>>>
>>> -derek
>>>
>>> --
>>> Derek Atkins 617-623-3745 <(617)%20623-3745>
>>> derek(a)ihtfp.com www.ihtfp.com
>>> Computer and Internet Security Consultant
>>> _______________________________________________
>>> Users mailing list
>>> Users(a)ovirt.org
>>> http://lists.ovirt.org/mailman/listinfo/users
>>>
>>
------------15ee1f64bf56c4a27ea22b7738
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Content-Transfer-Encoding: 8bit
<html>
<head>
</head>
<body>
<div style="color: black;">
<div style="color: black;">
<p style="margin: 0 0 1em 0; color: black;">On the host or in the guests?
</p>
<p style="margin: 0 0 1em 0; color: black;">-derek<br>
Sent using my mobile device. Please excuse any typos. <br>
</p>
</div>
<div style="color: black;">
<p
style="color: black; font-size: 10pt; font-family: Arial, sans-serif; margin: 10pt
0;">On
October 3, 2017 7:15:35 AM Colin Coe &lt;colin.coe(a)gmail.com&gt; wrote:</p>
<blockquote type="cite" class="gmail_quote"
style="margin: 0 0 0 0.75ex; border-left: 1px solid #808080; padding-left:
0.75ex;">
<div dir="auto">Spanning Tree Protocol.<div
dir="auto"><br></div><div
dir="auto">Make sure the /etc/sysconfig/network-scripts/ifcfg-eth0 (or
whatever) does not have an STP=yes line.</div><div
dir="auto"><br></div><div
dir="auto">CC</div></div><div
class="gmail_extra"><br><div class="gmail_quote">On 3
Oct. 2017 19:11,
"Derek Atkins" <<a
href="mailto:derek@ihtfp.com">derek@ihtfp.com</a>> wrote:<br
type="attribution"><blockquote class="gmail_quote"
style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div>
<div style="color:black">
<div style="color:black">
<p style="margin:0 0 1em 0;color:black">I'm sorry. What is STP?
<br>
And how do I turn that off? </p>
<p style="margin:0 0 1em 0;color:black">-derek<br>
Sent using my mobile device. Please excuse any typos. <br>
</p>
</div>
<div style="color:black">
<p
style="color:black;font-size:10pt;font-family:Arial,sans-serif;margin:10pt
0">On
October 2, 2017 7:41:15 PM Colin Coe <<a
href="mailto:colin.coe@gmail.com"
target="_blank">colin.coe(a)gmail.com</a>&gt; wrote:</p>
<blockquote type="cite" class="gmail_quote"
style="margin:0 0 0 0.75ex;border-left:1px solid
#808080;padding-left:0.75ex">
<div dir="ltr"><div dir="auto"></div><div
class="gmail_extra">Hi</div><div
class="gmail_extra"><br></div><div
class="gmail_extra">We saw something
very similar to this a couple of years ago. In our case, it was caused by
STP being enabled on our hypervisors.</div><div
class="gmail_extra"><br></div><div
class="gmail_extra">HTH</div><div
class="gmail_extra"><br></div><div
class="gmail_extra"><br></div><div
class="gmail_extra"><br><div class="gmail_quote">On 3
Oct. 2017 04:56,
"Derek Atkins" <<a href="mailto:derek@ihtfp.com"
target="_blank">derek(a)ihtfp.com</a>&gt; wrote:<br
type="attribution"><blockquote class="gmail_quote"
style="margin:0 0 0 .8ex;border-left:1px #ccc
solid;padding-left:1ex">Hi,<br>
<br>
I'm at my wits end so I'm tossing this here in the hopes that
SOMEONE<br>
will be able to help me.<br>
<br>
tl;dr: Ovirt is doing something on my network that is causing my fiber<br>
modem to go from 3-5ms to 300-1000+ms round trip times. I know it's<br>
ovirt because when I unplug ovirt from my network the issue goes away;<br>
when I plug it back in, the issue recurs.<br>
<br>
Long version:<br>
<br>
I've been running Ovirt 4.0.6 happily on CentOS 7.3 for several months<br>
on a single host machine. Indeed, the host had an uptime of 200+ days<br>
and was working great until approximately midnight, September 21/22<br>
(just over a week ago). I was on an airplane halfway across the<br>
Atlantic at that time, so it wasn't anything I did.<br>
<br>
My network is configured as:<br>
<br>
fiber modem <-> edgerouter <-> switch <->
everything
else<br>
<br>
ovirt is living in the "everything else" area.<br>
<br>
When I sit with a laptop connected to either the everything else range<br>
or even directly connected to the fiber modem, I run 'mtr' and
see<br>
network times (starting at the fiber modem) that bounce all over the<br>
place. When I unplug ovirt I see consistent 3-5ms times. Plug it back<br>
in, voom, back up to badness.<br>
<br>
I've spent several hours plugging and unplugging different devices<br>
trying to isolate the issue. The only "device" that has any
effect is<br>
my ovirt box.<br>
<br>
I have tried to debug this in several ways, but really the only thing<br>
that seems to have helped at all is shutting down all the VMs and the<br>
hosted engine. Once nothing else is running (but the host itself), only<br>
then does the network seem to return to normal.<br>
<br>
I'm really at my wits end on this; I have no idea what is causing this<br>
or what might have changed to cause the issue right at that time. I<br>
also can't imagine what ovirt is doing over the network that could
cause<br>
the modem, two physical hops away, to lose its mind in this way. But my<br>
experiementation is definitely showing a direct correlation.<br>
<br>
Help!!<br>
<br>
-derek<br>
<br>
--<br>
Derek Atkins <a href="tel:(617)%20623-3745"
value="+16176233745"
target="_blank">617-623-3745</a><br>
<a href="mailto:derek@ihtfp.com"
target="_blank">derek(a)ihtfp.com</a> <a
href="http://www.ihtfp.com" rel="noreferrer"
target="_blank">www.ihtfp.com</a><br>
Computer and Internet Security Consultant<br>
______________________________<wbr>_________________<br>
Users mailing list<br>
<a href="mailto:Users@ovirt.org"
target="_blank">Users(a)ovirt.org</a><br>
<a href="http://lists.ovirt.org/mailman/listinfo/users"
rel="noreferrer"
target="_blank">http://lists.ovirt.org/mailman<wbr>/li...
</blockquote></div></div>
</div>
</blockquote>
</div>
</div>
</div>
</blockquote></div></div>
</blockquote>
</div>
</div>
</body>
</html>
------------15ee1f64bf56c4a27ea22b7738--
5:38 a.m.
Derek,
Have you used tcpdump to check what network traffic is coming out of your
box? Is it possible that it is some kind of DoS attack from outside in or
that your VM was compromised and is attacking other external hosts?
Hope you get to the bottom of it!
Jason.
Sent with AquaMail for Android
http://www.aqua-mail.com
On October 2, 2017 4:56:54 PM Derek Atkins <derek(a)ihtfp.com> wrote:
Hi,
I'm at my wits end so I'm tossing this here in the hopes that SOMEONE
will be able to help me.
tl;dr: Ovirt is doing something on my network that is causing my fiber
modem to go from 3-5ms to 300-1000+ms round trip times. I know it's
ovirt because when I unplug ovirt from my network the issue goes away;
when I plug it back in, the issue recurs.
Long version:
I've been running Ovirt 4.0.6 happily on CentOS 7.3 for several months
on a single host machine. Indeed, the host had an uptime of 200+ days
and was working great until approximately midnight, September 21/22
(just over a week ago). I was on an airplane halfway across the
Atlantic at that time, so it wasn't anything I did.
My network is configured as:
fiber modem <-> edgerouter <-> switch <-> everything else
ovirt is living in the "everything else" area.
When I sit with a laptop connected to either the everything else range
or even directly connected to the fiber modem, I run 'mtr' and see
network times (starting at the fiber modem) that bounce all over the
place. When I unplug ovirt I see consistent 3-5ms times. Plug it back
in, voom, back up to badness.
I've spent several hours plugging and unplugging different devices
trying to isolate the issue. The only "device" that has any effect is
my ovirt box.
I have tried to debug this in several ways, but really the only thing
that seems to have helped at all is shutting down all the VMs and the
hosted engine. Once nothing else is running (but the host itself), only
then does the network seem to return to normal.
I'm really at my wits end on this; I have no idea what is causing this
or what might have changed to cause the issue right at that time. I
also can't imagine what ovirt is doing over the network that could cause
the modem, two physical hops away, to lose its mind in this way. But my
experiementation is definitely showing a direct correlation.
Help!!
-derek
--
Derek Atkins 617-623-3745
derek(a)ihtfp.com www.ihtfp.com
Computer and Internet Security Consultant
_______________________________________________
Users mailing list
Users(a)ovirt.org
http://lists.ovirt.org/mailman/listinfo/users
5:39 a.m.
This is a multi-part message in MIME format.
------------15ee20900c06c4a27ea1be6ae3
Content-Type: text/plain; format=flowed; charset="UTF-8"
Content-Transfer-Encoding: 8bit
A quick check of the host shows STP=off in ifcfg-ovirtmgmt. I see nothing
about STP elsewhere in the configuration on the host.
-derek
Sent using my mobile device. Please excuse any typos.
On October 3, 2017 7:15:35 AM Colin Coe <colin.coe(a)gmail.com> wrote:
Spanning Tree Protocol.
Make sure the /etc/sysconfig/network-scripts/ifcfg-eth0 (or whatever) does
not have an STP=yes line.
CC
On 3 Oct. 2017 19:11, "Derek Atkins" <derek(a)ihtfp.com> wrote:
> I'm sorry. What is STP?
> And how do I turn that off?
>
> -derek
> Sent using my mobile device. Please excuse any typos.
>
> On October 2, 2017 7:41:15 PM Colin Coe <colin.coe(a)gmail.com> wrote:
>
>> Hi
>>
>> We saw something very similar to this a couple of years ago. In our
>> case, it was caused by STP being enabled on our hypervisors.
>>
>> HTH
>>
>>
>>
>> On 3 Oct. 2017 04:56, "Derek Atkins" <derek(a)ihtfp.com> wrote:
>>
>>> Hi,
>>>
>>> I'm at my wits end so I'm tossing this here in the hopes that
SOMEONE
>>> will be able to help me.
>>>
>>> tl;dr: Ovirt is doing something on my network that is causing my fiber
>>> modem to go from 3-5ms to 300-1000+ms round trip times. I know it's
>>> ovirt because when I unplug ovirt from my network the issue goes away;
>>> when I plug it back in, the issue recurs.
>>>
>>> Long version:
>>>
>>> I've been running Ovirt 4.0.6 happily on CentOS 7.3 for several months
>>> on a single host machine. Indeed, the host had an uptime of 200+ days
>>> and was working great until approximately midnight, September 21/22
>>> (just over a week ago). I was on an airplane halfway across the
>>> Atlantic at that time, so it wasn't anything I did.
>>>
>>> My network is configured as:
>>>
>>> fiber modem <-> edgerouter <-> switch <-> everything
else
>>>
>>> ovirt is living in the "everything else" area.
>>>
>>> When I sit with a laptop connected to either the everything else range
>>> or even directly connected to the fiber modem, I run 'mtr' and see
>>> network times (starting at the fiber modem) that bounce all over the
>>> place. When I unplug ovirt I see consistent 3-5ms times. Plug it back
>>> in, voom, back up to badness.
>>>
>>> I've spent several hours plugging and unplugging different devices
>>> trying to isolate the issue. The only "device" that has any effect
is
>>> my ovirt box.
>>>
>>> I have tried to debug this in several ways, but really the only thing
>>> that seems to have helped at all is shutting down all the VMs and the
>>> hosted engine. Once nothing else is running (but the host itself), only
>>> then does the network seem to return to normal.
>>>
>>> I'm really at my wits end on this; I have no idea what is causing this
>>> or what might have changed to cause the issue right at that time. I
>>> also can't imagine what ovirt is doing over the network that could cause
>>> the modem, two physical hops away, to lose its mind in this way. But my
>>> experiementation is definitely showing a direct correlation.
>>>
>>> Help!!
>>>
>>> -derek
>>>
>>> --
>>> Derek Atkins 617-623-3745 <(617)%20623-3745>
>>> derek(a)ihtfp.com www.ihtfp.com
>>> Computer and Internet Security Consultant
>>> _______________________________________________
>>> Users mailing list
>>> Users(a)ovirt.org
>>> http://lists.ovirt.org/mailman/listinfo/users
>>>
>>
------------15ee20900c06c4a27ea1be6ae3
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: 8bit
<html>
<head>
</head>
<body>
<div style="color: black;">
<div style="color: black;">
<p style="margin: 0 0 1em 0; color: black;">A quick check of the host
shows
STP=off in ifcfg-ovirtmgmt. I see nothing about STP elsewhere in the
configuration on the host. </p>
<p style="margin: 0 0 1em 0; color: black;">-derek<br>
Sent using my mobile device. Please excuse any typos. <br>
</p>
</div>
<div style="color: black;">
<p
style="color: black; font-size: 10pt; font-family: Arial, sans-serif; margin: 10pt
0;">On
October 3, 2017 7:15:35 AM Colin Coe &lt;colin.coe(a)gmail.com&gt; wrote:</p>
<blockquote type="cite" class="gmail_quote"
style="margin: 0 0 0 0.75ex; border-left: 1px solid #808080; padding-left:
0.75ex;">
<div dir="auto">Spanning Tree Protocol.<div
dir="auto"><br></div><div
dir="auto">Make sure the /etc/sysconfig/network-scripts/ifcfg-eth0 (or
whatever) does not have an STP=yes line.</div><div
dir="auto"><br></div><div
dir="auto">CC</div></div><div
class="gmail_extra"><br><div class="gmail_quote">On 3
Oct. 2017 19:11,
"Derek Atkins" <<a
href="mailto:derek@ihtfp.com">derek@ihtfp.com</a>> wrote:<br
type="attribution"><blockquote class="gmail_quote"
style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div>
<div style="color:black">
<div style="color:black">
<p style="margin:0 0 1em 0;color:black">I'm sorry. What is STP?
<br>
And how do I turn that off? </p>
<p style="margin:0 0 1em 0;color:black">-derek<br>
Sent using my mobile device. Please excuse any typos. <br>
</p>
</div>
<div style="color:black">
<p
style="color:black;font-size:10pt;font-family:Arial,sans-serif;margin:10pt
0">On
October 2, 2017 7:41:15 PM Colin Coe <<a
href="mailto:colin.coe@gmail.com"
target="_blank">colin.coe(a)gmail.com</a>&gt; wrote:</p>
<blockquote type="cite" class="gmail_quote"
style="margin:0 0 0 0.75ex;border-left:1px solid
#808080;padding-left:0.75ex">
<div dir="ltr"><div dir="auto"></div><div
class="gmail_extra">Hi</div><div
class="gmail_extra"><br></div><div
class="gmail_extra">We saw something
very similar to this a couple of years ago. In our case, it was caused by
STP being enabled on our hypervisors.</div><div
class="gmail_extra"><br></div><div
class="gmail_extra">HTH</div><div
class="gmail_extra"><br></div><div
class="gmail_extra"><br></div><div
class="gmail_extra"><br><div class="gmail_quote">On 3
Oct. 2017 04:56,
"Derek Atkins" <<a href="mailto:derek@ihtfp.com"
target="_blank">derek(a)ihtfp.com</a>&gt; wrote:<br
type="attribution"><blockquote class="gmail_quote"
style="margin:0 0 0 .8ex;border-left:1px #ccc
solid;padding-left:1ex">Hi,<br>
<br>
I'm at my wits end so I'm tossing this here in the hopes that
SOMEONE<br>
will be able to help me.<br>
<br>
tl;dr: Ovirt is doing something on my network that is causing my fiber<br>
modem to go from 3-5ms to 300-1000+ms round trip times. I know it's<br>
ovirt because when I unplug ovirt from my network the issue goes away;<br>
when I plug it back in, the issue recurs.<br>
<br>
Long version:<br>
<br>
I've been running Ovirt 4.0.6 happily on CentOS 7.3 for several months<br>
on a single host machine. Indeed, the host had an uptime of 200+ days<br>
and was working great until approximately midnight, September 21/22<br>
(just over a week ago). I was on an airplane halfway across the<br>
Atlantic at that time, so it wasn't anything I did.<br>
<br>
My network is configured as:<br>
<br>
fiber modem <-> edgerouter <-> switch <->
everything
else<br>
<br>
ovirt is living in the "everything else" area.<br>
<br>
When I sit with a laptop connected to either the everything else range<br>
or even directly connected to the fiber modem, I run 'mtr' and
see<br>
network times (starting at the fiber modem) that bounce all over the<br>
place. When I unplug ovirt I see consistent 3-5ms times. Plug it back<br>
in, voom, back up to badness.<br>
<br>
I've spent several hours plugging and unplugging different devices<br>
trying to isolate the issue. The only "device" that has any
effect is<br>
my ovirt box.<br>
<br>
I have tried to debug this in several ways, but really the only thing<br>
that seems to have helped at all is shutting down all the VMs and the<br>
hosted engine. Once nothing else is running (but the host itself), only<br>
then does the network seem to return to normal.<br>
<br>
I'm really at my wits end on this; I have no idea what is causing this<br>
or what might have changed to cause the issue right at that time. I<br>
also can't imagine what ovirt is doing over the network that could
cause<br>
the modem, two physical hops away, to lose its mind in this way. But my<br>
experiementation is definitely showing a direct correlation.<br>
<br>
Help!!<br>
<br>
-derek<br>
<br>
--<br>
Derek Atkins <a href="tel:(617)%20623-3745"
value="+16176233745"
target="_blank">617-623-3745</a><br>
<a href="mailto:derek@ihtfp.com"
target="_blank">derek(a)ihtfp.com</a> <a
href="http://www.ihtfp.com" rel="noreferrer"
target="_blank">www.ihtfp.com</a><br>
Computer and Internet Security Consultant<br>
______________________________<wbr>_________________<br>
Users mailing list<br>
<a href="mailto:Users@ovirt.org"
target="_blank">Users(a)ovirt.org</a><br>
<a href="http://lists.ovirt.org/mailman/listinfo/users"
rel="noreferrer"
target="_blank">http://lists.ovirt.org/mailman<wbr>/li...
</blockquote></div></div>
</div>
</blockquote>
</div>
</div>
</div>
</blockquote></div></div>
</blockquote>
</div>
</div>
</body>
</html>
------------15ee20900c06c4a27ea1be6ae3--
7:25 a.m.
Hi,
Yes, I have (well, wireshark, but effectively the same thing).
Nothing is standing out.
I'm trying to visually coordinate the wireshark traces with my mtr run to
try to see "what's going on when my RTTs skyrocket". Honestly the only
correlation I'm seeing is that it's when the ovirt host is checking the
ovirt engine health (and I get a bunch of TCP out of order messages).
I've already ruled out overflow of my Arris modem NAT/forwarding table.
I've already ruled out Ethernet Pause Frames.
I don't understand how something inside my network can affect the Arris in
such a profound way across both the switch and router.
-derek
On Tue, October 3, 2017 7:38 am, Jason Keltz wrote:
Derek,
Have you used tcpdump to check what network traffic is coming out of your
box? Is it possible that it is some kind of DoS attack from outside in or
that your VM was compromised and is attacking other external hosts?
Hope you get to the bottom of it!
Jason.
Sent with AquaMail for Android
http://www.aqua-mail.com
On October 2, 2017 4:56:54 PM Derek Atkins <derek(a)ihtfp.com> wrote:
> Hi,
>
> I'm at my wits end so I'm tossing this here in the hopes that SOMEONE
> will be able to help me.
>
> tl;dr: Ovirt is doing something on my network that is causing my fiber
> modem to go from 3-5ms to 300-1000+ms round trip times. I know it's
> ovirt because when I unplug ovirt from my network the issue goes away;
> when I plug it back in, the issue recurs.
>
> Long version:
>
> I've been running Ovirt 4.0.6 happily on CentOS 7.3 for several months
> on a single host machine. Indeed, the host had an uptime of 200+ days
> and was working great until approximately midnight, September 21/22
> (just over a week ago). I was on an airplane halfway across the
> Atlantic at that time, so it wasn't anything I did.
>
> My network is configured as:
>
> fiber modem <-> edgerouter <-> switch <-> everything else
>
> ovirt is living in the "everything else" area.
>
> When I sit with a laptop connected to either the everything else range
> or even directly connected to the fiber modem, I run 'mtr' and see
> network times (starting at the fiber modem) that bounce all over the
> place. When I unplug ovirt I see consistent 3-5ms times. Plug it back
> in, voom, back up to badness.
>
> I've spent several hours plugging and unplugging different devices
> trying to isolate the issue. The only "device" that has any effect is
> my ovirt box.
>
> I have tried to debug this in several ways, but really the only thing
> that seems to have helped at all is shutting down all the VMs and the
> hosted engine. Once nothing else is running (but the host itself), only
> then does the network seem to return to normal.
>
> I'm really at my wits end on this; I have no idea what is causing this
> or what might have changed to cause the issue right at that time. I
> also can't imagine what ovirt is doing over the network that could cause
> the modem, two physical hops away, to lose its mind in this way. But my
> experiementation is definitely showing a direct correlation.
>
> Help!!
>
> -derek
>
> --
> Derek Atkins 617-623-3745
> derek(a)ihtfp.com www.ihtfp.com
> Computer and Internet Security Consultant
> _______________________________________________
> Users mailing list
> Users(a)ovirt.org
> http://lists.ovirt.org/mailman/listinfo/users
>
--
Derek Atkins 617-623-3745
derek(a)ihtfp.com www.ihtfp.com
Computer and Internet Security Consultant
5:58 p.m.
Hi,
I've done a lot more testing today. I've narrowed the issues down to
two specific VMs. When I'm running either of these two VMs I get
horrific network performance. When both of those two are stopped, my
network is just fine (like 99% of the time).
I've been spending the day gathering packet dumps. I'm running
wireshark on my host listening to the ovirtmgmt bridge (which is my only
network). So, that SHOULD be capturing everything, right?
I have not noticed anything out of the ordinary except for one odd
thing -- corellated with my network wonkiness wireshark reports a bunch
of duplicate or out-of-order TCP packets! I'll just note that
corellation does not imply causation, but I'm not seeing anything else
out of the ordinary. I certainly don't see anything that would imply
I've been hacked.
Is there something with CentOS/ovirt-host/vdsm networking that could
cause this? Or could it be a router issue? Specifically my host and my
hosted-engine are on separate logical networks (different /24s) but
both networks are on the same physical wire; my router, an ERPro8, uses
a single interface with both /24s assigned and routes between them. But
some of the duplicate/out-of-order was for the periodic host <-> engine
health checks.
Still, I'm not sure why it's these two specific VMs that are causing my
issues, other than that they have the most amount of network traffic
coming/going. If it IS a router problem (the router is relatively new,
and also updated with the latest firmware), I'm honestly not sure how to
properly test that.
Any more ideas where I can look, or what I can/should be looking for?
I'm extremely comfortable with internet technologies (25+ years
experience) but this has got me stumpted!
Thanks,
-derek
Jason Keltz <jas(a)cse.yorku.ca> writes:
Derek,
Have you used tcpdump to check what network traffic is coming out of
your box? Is it possible that it is some kind of DoS attack from
outside in or that your VM was compromised and is attacking other
external hosts?
Hope you get to the bottom of it!
Jason.
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http://www.aqua-mail.com
On October 2, 2017 4:56:54 PM Derek Atkins <derek(a)ihtfp.com> wrote:
> Hi,
>
> I'm at my wits end so I'm tossing this here in the hopes that SOMEONE
> will be able to help me.
>
> tl;dr: Ovirt is doing something on my network that is causing my fiber
> modem to go from 3-5ms to 300-1000+ms round trip times. I know it's
> ovirt because when I unplug ovirt from my network the issue goes away;
> when I plug it back in, the issue recurs.
>
> Long version:
>
> I've been running Ovirt 4.0.6 happily on CentOS 7.3 for several months
> on a single host machine. Indeed, the host had an uptime of 200+ days
> and was working great until approximately midnight, September 21/22
> (just over a week ago). I was on an airplane halfway across the
> Atlantic at that time, so it wasn't anything I did.
>
> My network is configured as:
>
> fiber modem <-> edgerouter <-> switch <-> everything else
>
> ovirt is living in the "everything else" area.
>
> When I sit with a laptop connected to either the everything else range
> or even directly connected to the fiber modem, I run 'mtr' and see
> network times (starting at the fiber modem) that bounce all over the
> place. When I unplug ovirt I see consistent 3-5ms times. Plug it back
> in, voom, back up to badness.
>
> I've spent several hours plugging and unplugging different devices
> trying to isolate the issue. The only "device" that has any effect is
> my ovirt box.
>
> I have tried to debug this in several ways, but really the only thing
> that seems to have helped at all is shutting down all the VMs and the
> hosted engine. Once nothing else is running (but the host itself), only
> then does the network seem to return to normal.
>
> I'm really at my wits end on this; I have no idea what is causing this
> or what might have changed to cause the issue right at that time. I
> also can't imagine what ovirt is doing over the network that could cause
> the modem, two physical hops away, to lose its mind in this way. But my
> experiementation is definitely showing a direct correlation.
>
> Help!!
>
> -derek
>
> --
> Derek Atkins 617-623-3745
> derek(a)ihtfp.com www.ihtfp.com
> Computer and Internet Security Consultant
> _______________________________________________
> Users mailing list
> Users(a)ovirt.org
> http://lists.ovirt.org/mailman/listinfo/users
>
--
Derek Atkins 617-623-3745
derek(a)ihtfp.com www.ihtfp.com
Computer and Internet Security Consultant
2406
days inactive
2408
days old
9 comments
3 participants
participants (3)
-
Colin Coe -
Derek Atkins -
Jason Keltz