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Re: replacing a NIC

On Thursday, 16.06.2005 at 16:21 -0600, Paul E Condon wrote:

> > Hello,
> > 
> > We had a 3com NIC go bad and replaced it with and Intel card.
> > 
> > I'm noticing odd behavior.  The kernel/NIC runs a self-test and says
> > that it's up in 100 Full Duplex mode.  [ This is good. ]  I try to
> > ping some sites to verify and I get 100% packet loss.  I did ping to
> > the broadcast address and machines on the LAN responded. [ This is
> > good. ]  Then I could ping www.cisco.com.  [ This is very good. ]  A
> > day later, I can't get out to any machines on the LAN or on the
> > internet. As a test, I went back and did a ping to the broadcast
> > address.  No other machines responded this time.
> > 
> > I have the feeling that some network guy, put a block on the wall
> > jack ...
> If there is some other equipment on the LAN that is running 10, then
> the whole segment of the LAN must run 10. If the LAN is dynamically
> changed with equipment swapped out and in without powering down the
> hubs, then the equipment that originally required 10 may no longer be
> connected. A trick that I use on my junky old LAN is to power down my
> hubs momentarily and let them reconfigure on power-up.

Erm, that *only* applies if he has a *hub* (which he didn't actually
specify).  If you have switches, rather than hubs, then each piece of
equipment will negotiate its own speed (10-megabit, 100-megabit, gigabit
or whatever) with the switch.

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