On 12/27/2010 02:37 PM, E Westphal wrote:

On Mon, 2010-12-27 at 17:29 -0500, Ryan Wagoner wrote: 
On Mon, Dec 27, 2010 at 5:22 PM, E Westphal <enwestph@rochester.rr.com> wrote:
> Have  you experienced this? What's going on when this occurs? What do I need
> to do to keep it from occurring? Please advise. Thanks.
>
>
> Dec  4 10:18:28 localhost kernel: e1000: eth1 NIC Link is Up 100 Mbps Full
> Duplex, Flow Control: RX/TX
> Dec  4 10:18:29 localhost kernel: e1000: eth1 NIC Link is Down


What is the NIC connected to? Have you tried a different switch port
or network cable? Does rebooting the server make the problem go away
for a bit? It seems like you need to perform some basic
troubleshooting and let us know what you have an have no tried.

Ryan
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I've tried all the obvious things. Cables, router ports, rebooting etc. It's quite strange. From a cold bootup, it's fine. Then about 45 minutes later it starts to act up. None of the obvious things seem to help. Then, about 90 minutes after bootup, everything is fine again! Rock solid! Ethtool and anything else I've tried fails to yield any hints, thus my question to all of you.



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Are running the latest CentOS 5.5 release with all updates installed?  Back around 5.0 through at least 5.1, possibly even 5.2, there were some driver bugs that affected some ethernet cards.  I have also seen problems that showed up with cheap switch hardware and went away when plugged into a different switch.   As far as inexpensive switches go, the low end HP managed switches are one of the few that I've had good luck with.

Nataraj