Hi,
Is your DHCP server a VM running on the same host? I've seem some
strange issues where a VM could not obtain a DHCP lease if it was
running on the same physical machine as the client. If this is the case,
I can look up what I had to change, otherwise ignore it.
Regards,
Rik
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.
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 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
Best regards
Roberto Nunin
Infrastructure Manager
Italy
Here are interfaces configs:
eno1:
DEVICE=eno1
HWADDR=38:63:bb:4a:47:b0
MASTER=bond0
NM_CONTROLLED=no
ONBOOT=yes
SLAVE=yes
eno2:
DEVICE=eno2
HWADDR=38:63:bb:4a:47:b4
MASTER=bond0
NM_CONTROLLED=no
ONBOOT=yes
SLAVE=yes
bond0:
BONDING_OPTS=mode=4 miimon=100
DEVICE=bond0
NM_CONTROLLED=no
ONBOOT=yes
TYPE=Bond
bond0.3500:
DEVICE=bond0.3500
VLAN=yes
BRIDGE=DMZ3_DEV
ONBOOT=no
MTU=1500
NM_CONTROLLED=no
HOTPLUG=no
DMZ3_DEV:
DEVICE=DMZ3_DEV
TYPE=Bridge
DELAY=0
STP=off
ONBOOT=no
MTU=1500
DEFROUTE=no
NM_CONTROLLED=no
HOTPLUG=no
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