1:05 p.m.
Hi,
I'm trying to use the VRRP protocol between two VMs, but the multicast
traffic never gets through. On the oVirt host I can see the VRRP
advertisements coming in for both VMs:
aio:~# tcpdump -n -X -i vnet3 net 224.0.0.0/4
listening on vnet3, link-type EN10MB (Ethernet), capture size 65535
bytes
18:58:31.841220 IP 10.1.2.3 > 224.0.0.18: VRRPv2, Advertisement, vrid 1,
prio 0, authtype none, intvl 1s, length 36
aio:~# tcpdump -n -X -i vnet8 net 224.0.0.0/4
listening on vnet8, link-type EN10MB (Ethernet), capture size 65535
bytes
19:02:26.907054 IP 10.1.2.4 > 224.0.0.18: VRRPv2, Advertisement, vrid 1,
prio 100, authtype none, intvl 1s, length 36
What is required to enable guest-to-guest multicast communication on an
oVirt node?
Thanks
- Frank
3:32 a.m.
Hi,
----- Original Message -----
From: "Frank Wall" <fw(a)moov.de>
To: users(a)ovirt.org
Sent: Friday, September 6, 2013 8:05:21 PM
Subject: [Users] Guest to guest multicast
Hi,
I'm trying to use the VRRP protocol between two VMs, but the multicast
traffic never gets through. On the oVirt host I can see the VRRP
advertisements coming in for both VMs:
aio:~# tcpdump -n -X -i vnet3 net 224.0.0.0/4
listening on vnet3, link-type EN10MB (Ethernet), capture size 65535
bytes
18:58:31.841220 IP 10.1.2.3 > 224.0.0.18: VRRPv2, Advertisement, vrid 1,
prio 0, authtype none, intvl 1s, length 36
aio:~# tcpdump -n -X -i vnet8 net 224.0.0.0/4
listening on vnet8, link-type EN10MB (Ethernet), capture size 65535
bytes
19:02:26.907054 IP 10.1.2.4 > 224.0.0.18: VRRPv2, Advertisement, vrid 1,
prio 100, authtype none, intvl 1s, length 36
What is required to enable guest-to-guest multicast communication on an
oVirt node?
Are they on the same virtual network/bridge?
Did you check iptables? You can add a rule to log such things and see if
it was iptables that blocked it (or something else). Check both host and VMs.
--
Didi
7:29 a.m.
Hi Yedidyah,
On 17.09.2013 09:32, Yedidyah Bar David wrote:
> What is required to enable guest-to-guest multicast
communication
> on an oVirt node?
Are they on the same virtual network/bridge?
Did you check iptables? You can add a rule to log such things and
see if it was iptables that blocked it (or something else). Check
both host and VMs.
yes, both guest interfaces are on the same virtual bridge:
mytestlan 8000.8000.000000000111 no dummy_3
vnet11
vnet13
On the host side iptables is configured to log rejected packets:
-A INPUT -j LOG -m limit --limit 2/min --log-prefix "REJECT: "
--log-level 4
But I've never seen any log message related to multicast traffic
while debugging this issue.
Thanks
- Frank
9:41 a.m.
Hi,
I've tested a multicast traffic between VMs which worked fine to me.
The test made between two VMs running on different hosts, connected
to the same switch.
The only pitfall i encountered was the firewall which blocked the
traffic. Once disabled, I was able to complete the test (used iperf).
Regards,
Moti
----- Original Message -----
From: "Frank Wall" <fw(a)moov.de>
To: users(a)ovirt.org
Sent: Friday, September 6, 2013 8:05:21 PM
Subject: [Users] Guest to guest multicast
Hi,
I'm trying to use the VRRP protocol between two VMs, but the multicast
traffic never gets through. On the oVirt host I can see the VRRP
advertisements coming in for both VMs:
aio:~# tcpdump -n -X -i vnet3 net 224.0.0.0/4
listening on vnet3, link-type EN10MB (Ethernet), capture size 65535
bytes
18:58:31.841220 IP 10.1.2.3 > 224.0.0.18: VRRPv2, Advertisement, vrid 1,
prio 0, authtype none, intvl 1s, length 36
aio:~# tcpdump -n -X -i vnet8 net 224.0.0.0/4
listening on vnet8, link-type EN10MB (Ethernet), capture size 65535
bytes
19:02:26.907054 IP 10.1.2.4 > 224.0.0.18: VRRPv2, Advertisement, vrid 1,
prio 100, authtype none, intvl 1s, length 36
What is required to enable guest-to-guest multicast communication on an
oVirt node?
Thanks
- Frank
_______________________________________________
Users mailing list
Users(a)ovirt.org
http://lists.ovirt.org/mailman/listinfo/users
7:33 a.m.
Hi Moti,
On 17.09.2013 15:41, Moti Asayag wrote:
I've tested a multicast traffic between VMs which worked fine to
me.
The test made between two VMs running on different hosts, connected
to the same switch.
would you please provide some details about how you tested the
multicast traffic between VMs? I would be interested in doing
the exact same tests on my side, i.e. running the same commands.
(Note that in my test setup all VMs run on the same host.)
Thanks
- Frank
10:18 a.m.
On 17.09.2013 15:41, Moti Asayag wrote:
I've tested a multicast traffic between VMs which worked fine to
me.
The test made between two VMs running on different hosts, connected
to the same switch.
OK, I found a secure way to test multicast communication:
(see http://www.linuxproblems.org/wiki/How_to_check_Multicasting)
# VM_A: start the receiver
VM_A# java -cp jgroups-3.3.3.Final.jar
org.jgroups.tests.McastReceiverTest -mcast_addr 231.12.21.132 -port
45566
Socket=0.0.0.0/0.0.0.0:45566, bind interface=/127.0.0.1
Socket=0.0.0.0/0.0.0.0:45566, bind interface=/10.1.2.3
# VM_B: start the sender, send message "test"
VM_B# java -cp jgroups-3.3.3.Final.jar org.jgroups.tests.McastSenderTest
-mcast_addr 231.12.21.132 -port 45566
Socket #1=0.0.0.0/0.0.0.0:45566, ttl=32, bind interface=/127.0.0.1
Socket #2=0.0.0.0/0.0.0.0:45566, ttl=32, bind interface=/10.1.2.4
test
# VM_A will receive the message
test [sender=10.1.2.4:45566]
So this basically means that multicast is working. For some reason,
VRRP/CARP is NOT working. This means pfSense HA and *BSD (u)CARP is
not usable right now.
Any hint? I'm out of ideas right now.
Thanks
- Frank
2:04 a.m.
----- Original Message -----
From: "Frank Wall" <fw(a)moov.de>
To: "Moti Asayag" <masayag(a)redhat.com>
Cc: users(a)ovirt.org
Sent: Wednesday, October 16, 2013 2:33:11 PM
Subject: Re: [Users] Guest to guest multicast
Hi Moti,
On 17.09.2013 15:41, Moti Asayag wrote:
> I've tested a multicast traffic between VMs which worked fine to me.
> The test made between two VMs running on different hosts, connected
> to the same switch.
would you please provide some details about how you tested the
multicast traffic between VMs? I would be interested in doing
the exact same tests on my side, i.e. running the same commands.
(Note that in my test setup all VMs run on the same host.)
I used iperf for testing multicast between the vms. See http://iperf.fr/#multicast
for the exact commands.
Thanks
- Frank
7:12 a.m.
Hi Moti,
On 17.10.2013 08:04, Moti Asayag wrote:
I used iperf for testing multicast between the vms. See
http://iperf.fr/#multicast
for the exact commands.
thanks, I did a quick test with iperf with a good result (445 out of 446
datagrams could be received). But still pfSense/FreeBSD CARP/uCARP does
not work, it seems to be filtered on the oVirt/KVM Host. Have you ever
heard of this? Any idea?
Thanks
- Frank
9:08 a.m.
----- Original Message -----
From: "Frank Wall" <fw(a)moov.de>
To: "Moti Asayag" <masayag(a)redhat.com>
Cc: users(a)ovirt.org
Sent: Thursday, October 17, 2013 2:12:35 PM
Subject: Re: [Users] Guest to guest multicast
Hi Moti,
On 17.10.2013 08:04, Moti Asayag wrote:
> I used iperf for testing multicast between the vms. See
> http://iperf.fr/#multicast
> for the exact commands.
thanks, I did a quick test with iperf with a good result (445 out of 446
datagrams could be received). But still pfSense/FreeBSD CARP/uCARP does
not work, it seems to be filtered on the oVirt/KVM Host. Have you ever
heard of this? Any idea?
On ovirt 3.2 we introduced the network-filters feature [1] which prevents guests
from spoofing other mac-addresses than these which assigned by the engine.
The feature is enable by default since introduced (for 3.2 and above)
There is a possibility that the implementation of the VRRP modifies the mac address
to the expected addresses which be ended in libvirt's filtering
(using the ebtables) the frames.
Could you try disabling the filter, restart the vms and re-run the test ?
1. On the ovirt-engine run: engine-config -s EnableMACAntiSpoofingFilterRules=false
--cver=3.3
(if you're using ovirt-engine 3.2, make sure to specify it in the --cver= option).
2. Restart the ovirt-engine service
3. Restart the vms
4. Re-run the test
An alternative might be to use the custom mac address for the vms which serves
as routers to start with 00-00-5E-00-01-XX (as long as the mac address will not
be replaced by the protocol)
[1] http://www.ovirt.org/Features/Design/Network/NetworkFiltering
[2]
Thanks
- Frank
9:33 a.m.
Hi Moti,
On 17.10.2013 15:08, Moti Asayag wrote:
Could you try disabling the filter, restart the vms and re-run the
test
?
1. On the ovirt-engine run: engine-config -s
EnableMACAntiSpoofingFilterRules=false --cver=3.3
(if you're using ovirt-engine 3.2, make sure to specify it in the
--cver= option).
2. Restart the ovirt-engine service
3. Restart the vms
4. Re-run the test
YES! This solved the VRRP problem. THANK YOU!
At some point I was already suspecting that ebtables and the
Anti-Spoofing
rules would be causing my problem, because I could see them in the XML
configuration of my VMs, but a "ebtables -L" did not show any rule. So I
kept on searching...
My question is: How would I find these Anti-Spoofing rules that
oVirt applies to each VM? Just want to find out at which point my
debugging went into the wrong direction ;-)
Thanks
- Frank
10:13 a.m.
----- Original Message -----
From: "Frank Wall" <fw(a)moov.de>
To: "Moti Asayag" <masayag(a)redhat.com>
Cc: users(a)ovirt.org
Sent: Thursday, October 17, 2013 4:33:51 PM
Subject: Re: [Users] Guest to guest multicast
Hi Moti,
On 17.10.2013 15:08, Moti Asayag wrote:
> Could you try disabling the filter, restart the vms and re-run the test
> ?
> 1. On the ovirt-engine run: engine-config -s
> EnableMACAntiSpoofingFilterRules=false --cver=3.3
> (if you're using ovirt-engine 3.2, make sure to specify it in the
> --cver= option).
> 2. Restart the ovirt-engine service
> 3. Restart the vms
> 4. Re-run the test
YES! This solved the VRRP problem. THANK YOU!
At some point I was already suspecting that ebtables and the
Anti-Spoofing
rules would be causing my problem, because I could see them in the XML
configuration of my VMs, but a "ebtables -L" did not show any rule. So I
kept on searching...
you should have specify the 'nat' table name and then you'd see the entire
rules:
ebtables -t nat -L
My question is: How would I find these Anti-Spoofing rules that
oVirt applies to each VM? Just want to find out at which point my
debugging went into the wrong direction ;-)
ovirt applies the same rules for all of the vm. A custom nwfilter rule named
'vdsm-no-mac-spoofing'
is being created by vdsm when it starts.
To see it contents requires using 'virsh' on the node:
virsh -r nwfilter-dumpxml vdsm-no-mac-spoofing
<uuid>c05471a7-9dee-6021-32e3-5d70e7617fc5</uuid>
<filterref filter='no-mac-spoofing'/>
<filterref filter='no-arp-mac-spoofing'/>
</filter>
where the 2 rules are predefined by libvirt's nwfilter.
Thanks
- Frank
1:12 a.m.
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participants (4)
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Frank Wall -
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Moti Asayag -
Yedidyah Bar David