On Thu, Oct 13, 2011 at 12:28 AM, Eric Searcy emsearcy@gmail.com wrote:
On 10/12/11 12:43 AM, Magicloud Magiclouds wrote:
Hi, This is a Centos 5.5 host with one xen guest. About 2 weeks ago, the host randomly lost network connection. By this I mean I could not connect to the services on it, or ping it. Also was the status of the guest. From serial console, I connected to the host, trying to see what happened. No clue (any error messages) in messages or dmesg. ifdown/ifup the interface did not help, either. Only rebooting was my only choice. Searching through Google, I got the information that some other guys met similar problem, and resolved by setting stp on with the bridge interface. I set it, too. And the problem still occurs. Any idea what I should check now? Thanks.
When outage occurs, from the host these might be good things to look at and/or share with the list:
ip link brctl show arp -n (arp -n from your next-hop router too) tcpdump -ln -i peth0 (try some activity; e.g. ping out to router, ping in from router) tcpdump -ln -i br0 (more activity)
Depending on your xen bridge setup the bridge might be named eth0 or virbr0; peth0 might be different too.
Eric _______________________________________________ CentOS-virt mailing list CentOS-virt@centos.org http://lists.centos.org/mailman/listinfo/centos-virt
Sorry for the delayed reply. As you guys said, I checked the hardware, even replaced something. I think it is sure that the hardware is OK. The system is CentOS 5.5, and for some reason I cannot update it. The problem always and only could be resolved by rebooting.