[ovirt-users] R: PXE boot of a VM on vdsm don't read DHCP offer
Roberto.Nunin at comifar.it
Thu May 7 16:01:14 UTC 2015
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 interfaces and VM virtio eth interface.
Physical servers on the same VLAN keep DHCP offers and boot from PXE correctly.
>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 accept the DHCP offer coming from DHCP server.
>Tcpdump capture started on the vdsm host, bond0 interface shows clearly that DHCP offers reach the vdsm interfaces >three times before PXE client ends in timeout.
>Incoming DHCP offer is correctly tagged when it comes to the bond0 interface 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=off and DELAY=0.
>If we install a VM using command line boot parameters, VM install & run fine. 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
Here are interfaces configs:
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