RHEL4.7/PE2950 and network issues

[Erik Anderson]

Have you played with any settings on the switch? I don't have any 3com
gear in my network (all the 3com switching gear I've had the
misfortune of using in the past has proved to be complete trash, but
that's beside the point), but have seen similar issues with a few
ports on one of my Cisco switches when I didn't have PortFast enabled
for that port. I'm not sure what the equivalent term is in 3com world,
but I'd start trying different config options for that server's switch
port.

-Erik



On 8/20/08, Tom.McComb at sungard.com <Tom.McComb at sungard.com> wrote:
> All right - I've lost all the hair I can afford to lose over this, so I turn
> to the list.
>
>
>
> I've got a PE 2950 (2 of them, actually), running RHEL4 update 6, and some
> serious network problems. (Well, serious to me and the users ). Here's an
> example:
>
>
>
> Ssh into the box. Look around - maybe edit a file or something. Step away
> for a few minutes (go get a cup of coffee, etc.). Come back, start typing. 1
> whole character shows up, then the session freezes for 30-45 seconds. After
> that, it frees up, and starts to work fine again.. Till you leave it for a
> few minutes.
>
>
>
> While it's frozen, doing a netstat -tan (from the console) will show a
> non-zero number in the Send-q for that connection.
>
>
>
> I can ping the box all day long without any problems.
>
>
>
> It happens with both servers, on both NICs in the servers.
>
>
>
> I've done a little troubleshooting - latest driver, latest BIOS, iscsi stuff
> turned off in the BIOS.
>
>
>
> If I connect directly via a crossover, it works fine.
>
>
>
> If I use a non-managed switch in the middle (2950 à switch ß laptop), it
> works fine.
>
>
>
> If I plug it into my 3com Superstack 3 3870 GB backbone switch, it exhibits
> the above. And yes - I've tried a different 3com switch and port (we've got
> 4 for our backbone). Same problem.
>
>
>
> Anyone? Anyone? Bueller? Bueller?
>
>
>
> TIA..
>
>


-- 
Erik Anderson
http://andersonfam.org