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Date: Sun, 29 Nov 2015 09:59:22 +0200
From: Dan Kenigsberg <danken@redhat.com>
To: mad Engineer <themadengin33r@gmail.com>, ibarkan@redhat.com
Cc: users <users@ovirt.org>, devel@ovirt.org, linux-kernel@vger.kernel.org
Subject: Re: [ovirt-devel] Networking fails for VM running on Centos6.7.Works
 on Centos6.5
Message-ID: <20151129075922.GA14401@redhat.com>
References: <CAN8oO4AM09Tm36-7ON=4UsR8aQLftXbcv8MmPQtzNe-zr0LJcQ@mail.gmail.com>
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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

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)