2015-11-29 8:59 GMT+01:00 Dan Kenigsberg <dan...@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. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/