[ovirt-users] R: PXE boot of a VM on vdsm don't read DHCP offer

Thursday, 7 May 2015

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Further info about this case:

An already installed and running VM (Centos7) with static IPv4 assignment, =
if  changed to DHCP mode, do not acquire the IP address.

In this case, tcpdump taken on the VM, do not show DHCP offer packets that =
are instead seen on the host bond interface.
Seems that something is filtering DHCP offers between host physical eth int=
erfaces and VM virtio eth interface.
Physical servers on the same VLAN keep DHCP offers and boot from PXE correc=
tly.

Roberto

...
Hi all 
...
We are using oVirt engine 3.5.1-0.0 on Centos 6.6
We are deploying two hosts with vdsm-4.16.10-8.gitc937927.el7.x86_64
No hosted-engine, it run on a dedicates VM, outside oVirt. 
...
Behavior: PXE boot of a VM, ends in timeout (0x4c106035), instead to
accep= t the DHCP offer coming from DHCP server.
...
Tcpdump capture started on the vdsm host, bond0 interface shows
clearly th= at DHCP offers reach the vdsm interfaces >three times before PXE
client end=
s in timeout.
...
Incoming DHCP offer is correctly tagged when it comes to the bond0
interfa= ce and forwarded to the bond0.bridge >interface.
...
PXE simply ignore it. PXE version is gPXE 0.9.7.
bond0.bridge interface is already setup with STP=3Doff and DELAY=3D0. 
...
If we install a VM using command  line boot parameters, VM install
& run f= ine. The issue is only related to PXE process, >when it is expected
to use =
the DHCP offer.

...
I can provide tcpdump capture, but I've not attached to the email
because = I'm quite new of the community and don't >know if it is
allowed/correct.

...
On another host, under the same engine, running
vdsm-4.16.12-7.gita30da75.= el6.x86_64 on Centos6.6, this behavior is >not
happening, everything works =
fine.

...
Any idea/suggestion/further investigation ?
Thanks for attention
Best regards 

Roberto Nunin
Infrastructure Manager
Italy

Here are interfaces configs:
eno1:
DEVICE=3D"eno1"
HWADDR=3D"38:63:bb:4a:47:b0"
MASTER=3D"bond0"
NM_CONTROLLED=3D"no"
ONBOOT=3D"yes"
SLAVE=3D"yes"
eno2:
DEVICE=3D"eno2"
HWADDR=3D"38:63:bb:4a:47:b4"
MASTER=3D"bond0"
NM_CONTROLLED=3D"no"
ONBOOT=3D"yes"
SLAVE=3D"yes"
bond0:
BONDING_OPTS=3D"mode=3D4 miimon=3D100"
DEVICE=3D"bond0"
NM_CONTROLLED=3D"no"
ONBOOT=3D"yes"
TYPE=3D"Bond"
bond0.3500:
DEVICE=3Dbond0.3500
VLAN=3Dyes
BRIDGE=3DDMZ3_DEV
ONBOOT=3Dno
MTU=3D1500
NM_CONTROLLED=3Dno
HOTPLUG=3Dno
DMZ3_DEV:
DEVICE=3DDMZ3_DEV
TYPE=3DBridge
DELAY=3D0
STP=3Doff
ONBOOT=3Dno
MTU=3D1500
DEFROUTE=3Dno
NM_CONTROLLED=3Dno
HOTPLUG=3Dno

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</head...
 <body lang=3D"IT"
link=3D"blue" vlink=3D"purple"...
 <div
class=3D"WordSection1"...
 Further=
 info about this case:<o:p></o:p></p...
 <o:p>&n=
bsp;</o:p></p...
 An alre=
ady installed and running VM (Centos7) with static IPv4 assignment, if&nbsp=
; changed to DHCP mode, do not acquire the IP
address.<o:p></o:p></p=
...
 <o:p>&n=
bsp;</o:p></p...
 In this=
 case, tcpdump taken on the VM, do not show DHCP offer packets that are ins=
tead seen on the host bond interface.<o:p></o:p></p...
 Seems t=
hat something is filtering DHCP offers between host physical eth interfaces=
 and VM virtio eth interface.<o:p></o:p></p...
 Physica=
l servers on the same VLAN keep DHCP offers and boot from PXE correctly.<o:=
p></o:p></p...
 <o:p>&n=
bsp;</o:p></p...
 Roberto=
<o:p></o:p></p...
 <o:p>&n=
bsp;</o:p></p...

<div...
 <p
class=3D"MsoNormal"><span lang=3D"EN-US"
style=3D"color:#1F497D;mso-fare=
ast-language:IT"><o:p>&nbsp;</o:p></span></p...

</div...
 <p
class=3D"MsoNormal"><span
lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p...
 <p class=3D"MsoNormal"
style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"color:#1F497D">&gt;</span><span
lang=3D"EN-US">Hi all<o:p></o:p></sp=
an></p...
 <p class=3D"MsoNormal"
style=3D"margin-left:35.4pt"><span lang=3D"EN-US"><o=
:p>&nbsp;</o:p></span></p...
 <p
class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span
lang=3D"EN-US" st=
yle=3D"color:#1F497D">&gt;</span><span
lang=3D"EN-US">We are using oVirt en=
gine 3.5.1-0.0 on Centos 6.6<o:p></o:p></span></p...
 <p class=3D"MsoNormal"
style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"color:#1F497D">&gt;</span><span
lang=3D"EN-US">We are deploying two =
hosts with
vdsm-4.16.10-8.gitc937927.el7.x86_64<o:p></o:p></span></p...
 <p class=3D"MsoNormal"
style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"color:#1F497D">&gt;</span><span
lang=3D"EN-US">No hosted-engine, it =
run on a dedicates VM, outside oVirt.<o:p></o:p></span></p...
 <p class=3D"MsoNormal"
style=3D"margin-left:35.4pt"><span lang=3D"EN-US"><o=
:p>&nbsp;</o:p></span></p...
 <p
class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span
lang=3D"EN-US" st=
yle=3D"color:#1F497D">&gt;</span><span
lang=3D"EN-US">Behavior: PXE boot of=
 a VM, ends in timeout (0x4c106035), instead to accept the DHCP offer comin=
g from DHCP server.<o:p></o:p></span></p...
 <p
class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span
lang=3D"EN-US" st=
yle=3D"color:#1F497D">&gt;</span><span
lang=3D"EN-US">Tcpdump capture start=
ed on the vdsm host, bond0 interface shows clearly that DHCP offers reach t=
he vdsm interfaces
<span style=3D"color:#1F497D">&gt;</span>three times before PXE
client ends=
 in timeout.<o:p></o:p></span></p...
 <p
class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span
lang=3D"EN-US" st=
yle=3D"color:#1F497D">&gt;</span><span
lang=3D"EN-US">Incoming DHCP offer i=
s correctly tagged when it comes to the bond0 interface and forwarded to th=
e bond0.bridge
<span
style=3D"color:#1F497D">&gt;</span>interface.<o:p></o:p></span></p...
 <p class=3D"MsoNormal"
style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"color:#1F497D">&gt;</span><span
lang=3D"EN-US">PXE simply ignore it.=
 PXE version is gPXE 0.9.7.<o:p></o:p></span></p...
 <p class=3D"MsoNormal"
style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"color:#1F497D">&gt;</span><span
lang=3D"EN-US">bond0.bridge interfac=
e is already setup with STP=3Doff and
DELAY=3D0.<o:p></o:p></span></p...
 <p
class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span
lang=3D"EN-US"><o=
:p>&nbsp;</o:p></span></p...
 <p
class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span
lang=3D"EN-US" st=
yle=3D"color:#1F497D">&gt;</span><span
lang=3D"EN-US">If we install a VM us=
ing command&nbsp; line boot parameters, VM install &amp; run fine. The issu=
e is only related to PXE process,
<span style=3D"color:#1F497D">&gt;</span>when it is expected to
use the DHC=
P offer.<o:p></o:p></span></p...
 <p
class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span
lang=3D"EN-US"><o=
:p>&nbsp;</o:p></span></p...
 <p
class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span
lang=3D"EN-US" st=
yle=3D"color:#1F497D">&gt;</span><span
lang=3D"EN-US">I can provide tcpdump=
 capture, but I&#8217;ve not attached to the email because I&#8217;m quite =
new of the community and don&#8217;t
<span style=3D"color:#1F497D">&gt;</span>know if it is
allowed/correct.<o:p=
></o:p></span></p...
 <p
class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span
lang=3D"EN-US"><o=
:p>&nbsp;</o:p></span></p...
 <p
class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span
lang=3D"EN-US" st=
yle=3D"color:#1F497D">&gt;</span><span
lang=3D"EN-US">On another host, unde=
r the same engine, running vdsm-4.16.12-7.gita30da75.el6.x86_64 on Centos6.=
6, this behavior is
<span style=3D"color:#1F497D">&gt;</span>not happening,
everything works fi=
ne.<o:p></o:p></span></p...
 <p
class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span
lang=3D"EN-US"><o=
:p>&nbsp;</o:p></span></p...
 <p
class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span
lang=3D"EN-US" st=
yle=3D"color:#1F497D">&gt;</span><span
lang=3D"EN-US">Any idea/suggestion/f=
urther investigation ?<o:p></o:p></span></p...
 <p class=3D"MsoNormal"
style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"color:#1F497D">&gt;</span><span
lang=3D"EN-US">Thanks for attention<=
o:p></o:p></span></p...
 <p
class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span
lang=3D"EN-US" st=
yle=3D"color:#1F497D">&gt;</span><span
lang=3D"EN-US">Best regards<o:p></o:=
p></span></p...
 <p class=3D"MsoNormal"
style=3D"margin-left:35.4pt"><span lang=3D"EN-US"><o=
:p>&nbsp;</o:p></span></p...
 <p
class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span
lang=3D"EN-US"><o=
:p>&nbsp;</o:p></span></p...
 <p
class=3D"MsoNormal"
style=3D"margin-left:35.4pt;text-autospace:none"><sp=
an style=3D"font-size:10.0pt;font-family:Consolas;mso-fareast-language:IT">=
Roberto Nunin<o:p></o:p></span></p...
 <p
class=3D"MsoNormal"
style=3D"margin-left:35.4pt;text-autospace:none"><sp=
an style=3D"font-size:10.0pt;font-family:Consolas;mso-fareast-language:IT">=
Infrastructure Manager<o:p></o:p></span></p...
 <p class=3D"MsoNormal"
style=3D"margin-left:35.4pt;text-autospace:none"><sp=
an style=3D"font-size:10.0pt;font-family:Consolas;mso-fareast-language:IT">=
Italy<o:p></o:p></span></p...
 <p
class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span
lang=3D"EN-US"><o=
:p>&nbsp;</o:p></span></p...
 <p
class=3D"MsoNormal"><span
lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p...
 <p class=3D"MsoNormal"><span
lang=3D"EN-US">Here are interfaces configs:<o:=
p></o:p></span></p...
 <p
class=3D"MsoNormal"><b><span
lang=3D"EN-US">eno1:<o:p></o:p></span></b><=
/p...
 <p class=3D"MsoNormal"><span
lang=3D"EN-US">DEVICE=3D&quot;eno1&quot;<o:p><=
/o:p></span></p...
 <p
class=3D"MsoNormal"><span
lang=3D"EN-US">HWADDR=3D&quot;38:63:bb:4a:47:b=
0&quot;<o:p></o:p></span></p...
 <p
class=3D"MsoNormal"><span
lang=3D"EN-US">MASTER=3D&quot;bond0&quot;<o:p>=
</o:p></span></p...
 <p
class=3D"MsoNormal"><span
lang=3D"EN-US">NM_CONTROLLED=3D&quot;no&quot;<=
o:p></o:p></span></p...
 <p
class=3D"MsoNormal"><span
lang=3D"EN-US">ONBOOT=3D&quot;yes&quot;<o:p></=
o:p></span></p...
 <p
class=3D"MsoNormal"><span
lang=3D"EN-US">SLAVE=3D&quot;yes&quot;<o:p></o=
:p></span></p...
 <p
class=3D"MsoNormal"><b>eno2:<o:p></o:p></b></p...
 <p
class=3D"MsoNormal">DEVICE=3D&quot;eno2&quot;<o:p></o:p></p...
 <p
class=3D"MsoNormal">HWADDR=3D&quot;38:63:bb:4a:47:b4&quot;<o:p></o:p></p=
...
 <p class=3D"MsoNormal"><span
lang=3D"EN-US">MASTER=3D&quot;bond0&quot;<o:p>=
</o:p></span></p...
 <p
class=3D"MsoNormal"><span
lang=3D"EN-US">NM_CONTROLLED=3D&quot;no&quot;<=
o:p></o:p></span></p...
 <p
class=3D"MsoNormal"><span
lang=3D"EN-US">ONBOOT=3D&quot;yes&quot;<o:p></=
o:p></span></p...
 <p
class=3D"MsoNormal"><span
lang=3D"EN-US">SLAVE=3D&quot;yes&quot;<o:p></o=
:p></span></p...
 <p
class=3D"MsoNormal"><b><span
lang=3D"EN-US">bond0:<o:p></o:p></span></b>=
</p...
 <p class=3D"MsoNormal"><span
lang=3D"EN-US">BONDING_OPTS=3D&quot;mode=3D4 m=
iimon=3D100&quot;<o:p></o:p></span></p...
 <p class=3D"MsoNormal"><span
lang=3D"EN-US">DEVICE=3D&quot;bond0&quot;<o:p>=
</o:p></span></p...
 <p
class=3D"MsoNormal"><span
lang=3D"EN-US">NM_CONTROLLED=3D&quot;no&quot;<=
o:p></o:p></span></p...
 <p
class=3D"MsoNormal"><span
lang=3D"EN-US">ONBOOT=3D&quot;yes&quot;<o:p></=
o:p></span></p...
 <p
class=3D"MsoNormal"><span
lang=3D"EN-US">TYPE=3D&quot;Bond&quot;<o:p></o=
:p></span></p...
 <p
class=3D"MsoNormal"><b><span
lang=3D"EN-US">bond0.3500:<o:p></o:p></span=
></b></p...
 <p
class=3D"MsoNormal"><span
lang=3D"EN-US">DEVICE=3Dbond0.3500<o:p></o:p><=
/span></p...
 <p
class=3D"MsoNormal"><span
lang=3D"EN-US">VLAN=3Dyes<o:p></o:p></span></p=
...
 <p class=3D"MsoNormal"><span
lang=3D"EN-US">BRIDGE=3DDMZ3_DEV<o:p></o:p></s=
pan></p...
 <p
class=3D"MsoNormal"><span
lang=3D"EN-US">ONBOOT=3Dno<o:p></o:p></span></=
p...
 <p class=3D"MsoNormal"><span
lang=3D"EN-US">MTU=3D1500<o:p></o:p></span></p=
...
 <p class=3D"MsoNormal"><span
lang=3D"EN-US">NM_CONTROLLED=3Dno<o:p></o:p></=
span></p...
 <p
class=3D"MsoNormal"><span
lang=3D"EN-US">HOTPLUG=3Dno<o:p></o:p></span><=
/p...
 <p class=3D"MsoNormal"><b><span
lang=3D"EN-US">DMZ3_DEV:<o:p></o:p></span><=
/b></p...
 <p
class=3D"MsoNormal"><span
lang=3D"EN-US">DEVICE=3DDMZ3_DEV<o:p></o:p></s=
pan></p...
 <p
class=3D"MsoNormal"><span
lang=3D"EN-US">TYPE=3DBridge<o:p></o:p></span>=
</p...
 <p class=3D"MsoNormal"><span
lang=3D"EN-US">DELAY=3D0<o:p></o:p></span></p...
 <p class=3D"MsoNormal"><span
lang=3D"EN-US">STP=3Doff<o:p></o:p></span></p...
 <p class=3D"MsoNormal"><span
lang=3D"EN-US">ONBOOT=3Dno<o:p></o:p></span></=
p...
 <p class=3D"MsoNormal"><span
lang=3D"EN-US">MTU=3D1500<o:p></o:p></span></p=
...
 <p class=3D"MsoNormal"><span
lang=3D"EN-US">DEFROUTE=3Dno<o:p></o:p></span>=
</p...
 <p class=3D"MsoNormal"><span
lang=3D"EN-US">NM_CONTROLLED=3Dno<o:p></o:p></=
span></p...
 <p
class=3D"MsoNormal"><span
lang=3D"EN-US">HOTPLUG=3Dno<o:p></o:p></span><=
/p...
 <p class=3D"MsoNormal"><span
lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p...
 <p class=3D"MsoNormal"><span
lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p...
 <p
class=3D"MsoNormal"><o:p>&nbsp;</o:p></p...

</div...

<br...

<hr...
 Questo
messaggio e' i=
ndirizzato esclusivamente al destinatario indicato e potrebbe contenere inf=
ormazioni confidenziali, riservate o proprietarie. Qualora la presente veni=
sse ricevuta per errore, si prega di segnalarlo
 immediatamente al mittente, cancellando l'originale e ogni sua copia e dis=
truggendo eventuali copie cartacee. Ogni altro uso e' strettamente proibito=
 e potrebbe essere fonte di violazione di legge.<br...

<br...
 This message is for the designated
recipient only and may contain privilege=
d, proprietary, or otherwise private information. If you have received it i=
n error, please notify the sender immediately, deleting the original and al=
l copies and destroying any hard
 copies. Any other use is strictly prohibited and may be unlawful.<br...

</font...

</body...

</html...

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[ovirt-users] R: PXE boot of a VM on vdsm don't read DHCP offer