Messages in this thread | | | Date | Sun, 29 Nov 2015 20:53:48 +0100 | Subject | Re: [ovirt-users] [ovirt-devel] Networking fails for VM running on Centos6.7.Works on Centos6.5 | From | Giorgio Bersano <> |
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2015-11-29 8:59 GMT+01:00 Dan Kenigsberg <danken@redhat.com>: > On Sat, Nov 28, 2015 at 08:10:06PM +0530, mad Engineer wrote: >> hello all i am having strange network issue with vms that are running on >> centos 6.7 ovirt nodes. >> >> I recently added one more ovirt node which is running centos6.7 and >> upgraded from centos6.5 to centos6.7 on all other nodes. >> >> All VMs running on nodes with centos6.7 as host Operating system fail to >> reach network gateway,but if i reboot that same host to centos6.5 kernel >> everything works fine(with out changing any network configuration). >> >> Initially i thought it as configuration issue but its there on all nodes.if >> i reboot to old kernel everything is working. >> >> I am aware about ghost vlan0 issue in centos6.6 kernel.Not aware about any >> issue in centos6.7 Also all my servers are up to date. >> >> >> All physical interfaces are in access mode VLAN connected to nexus 5k >> switches. >> >> >> working kernel- 2.6.32-431.20.3.el6.x86_64 >> >> non working kernel- 2.6.32-573.8.1.el6.x86_64
Do you have the possibility to test with kernel-2.6.32-504.16.2.el6.x86_64 (it's in CentOS Vault now) ?
What I have seen in our environment is that - regarding this problem - it is the latest correctly working kernel. There are clear signs of misbehaviours due to changes in the VLAN code between that kernel and the next one (2.6.32-504.23.4.el6.x86_64). Not always, it could also depend on the nic driver involved.
Also take a look at https://bugs.centos.org/view.php?id=9467 and https://bugzilla.redhat.com/show_bug.cgi?id=1263561 .
> Can you provide the topology of your VM network config (vlan, bond, bond > options, bridge options)? Do you have an IP address on the bridge? > > (I have not seen this happen myself)
Dan, did you see this https://www.mail-archive.com/users@ovirt.org/msg28561.html thread?
We have seen this bug in oVirt (bond+VLAN+bridges) but also in simple KVM with VLAN+bridges and with plain servers using VLANS directly over nic. Therefore I think the topology is almost unrelated and the problem regards VLAN code.
I would be very interested in https://bugzilla.redhat.com/show_bug.cgi?id=1264316 but public access is denied. Do you have access to it? I hope so.
Best regards, Giorgio.
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