[NTLUG:Discuss] Strange Network Problem(s) on RedHat 7.1

[Alan Andrews]

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You could be seeing an autonegotiate missmatch.  It's very common on SUN 
machines, and I've seen it on PCs before also.  Characteristics are sucky 
throughput and high CRC errors.  you can check by forcing both the switchport 
and the NIC to the same settings.  It doesn't matter what as long as both are 
the same.  If your CRCs clear up it's an autonegotiate problem.  


On Thursday 12 July 2001 13:45, you wrote:
> I'm not sure what's up with this, but I tried another NIC and it too
> failed.  Both NIC's were 3COM 3C905B-TXNM cards.  So I tried a 3rd
> card (same type) and it worked OK (it had a lot of collisions though).
> I checked the card configurations and the ones that didn't work were
> set to full duplex.  The one that did work was set to half duplex, so
> I changed on the the "bad" cards to half duplex and it worked OK (but
> again with collisions).  The server is connected directly to a
> CISCO 2900 Series switch which does support full duplex.  Does anyone
> know if there are any know driver problems with the 3COM NIC in full
> duplex mode?
>
> George
>
> "George E. Lass" wrote:
> > DOOH!
> > You are so correct.  As it turns out, I am
> > seeing an error rate of 70% when transfering a large file to my
> > server, but only 5% when transfering the same file from my server.
> > Looks like its time to get a new NIC!
> >
> > Thanks to all,
> >
> > George
> >
> > Aaron Goldblatt wrote:
> > > > P.S. The 2 PC's I'm working with are on the same 100mbps hub....
> > >
> > > I just went through a similiar experience, except the problem was
> > > affecting all communications over the relevant NIC.  Orignally I
> > > thought it was a dud driver setting on my RealTek 8139, but after
> > > further diagnosis it turned out that my EEPro100 had failed.  Replacing
> > > the card and recompiling the correct driver into the kernel (tulip, in
> > > this instance) worked wonders.
> > >
> > > Basic troubleshooting applies here.  Look for simple stuff you've
> > > forgotten, like bad cable ends and loose connections.
> > >
> > > ag
> > > _______________________________________________
> > > http://www.ntlug.org/mailman/listinfo/discuss
> >
> > _______________________________________________
> > http://www.ntlug.org/mailman/listinfo/discuss
>
> _______________________________________________
> http://www.ntlug.org/mailman/listinfo/discuss
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