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.
On Wednesday 12 October 2011 03:43, the following was written:
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?
I am no expert but it sounds like you might be in the early stages of hardware failure.
Next time this system stop responding check the following:
1. System interface state 2. Connected switch interface
If the switch shows down but the system shows up I wold start by replacing the NIC on the system.
Vreme: 10/12/2011 11:58 AM, Robert Spangler piše:
On Wednesday 12 October 2011 03:43, the following was written:
I am no expert but it sounds like you might be in the early stages of hardware failure.
Next time this system stop responding check the following:
- System interface state
- Connected switch interface
If the switch shows down but the system shows up I wold start by replacing the NIC on the system.
I had similar problems with my server and first thing I did was to hook it up to Monitor and keyboard (serial is good too).
In my case, it was (probably) network cable loosing connection. I new that once I was able to access server via keyboard and still had no connection. But in my case both NIC and switch showed connection just not blinking.
Did reboot help? Can you prepare another switch and LAN cable? Or maybe cheep router so you can connect them directly and try to ping router (set it on the same subnet).
NIC starting to broke can also be an issue, but you should also try looking for newer NIC drivers in ELRepo repository, some drivers have small bugs.
Upgrading from 5.5 to 5.7 might also solve your problem, is it is a driver problem and not hardware.
-
Ljubomir Ljubojevic -
Magicloud Magiclouds -
Robert Spangler