On this note, I have found in the past some Cisco switches that had one or
more ports set to always be 100Mb and Full Duplex and an old 10Mb NIC just
would not work.  Or a 10/100 NIC that was forced at 100Mb and Full and will
not autonegotiate.   In this case (on some cards) you may need to set them
back to factory defaults or auto with a DOS-based utility.  Its all worth
checking into.

----- Original Message -----
From: "Gerald Combs"

> On Sun, 27 Apr 2003, jose sanchez wrote:
>
> > I typed arp -an and I don't get any output. I don't
> > think are the cables or the NIC. I've already swapped
> > them and nothing changed. ifconfig or netstat don't
> > show any errors. What in the world is wrong?
>
> Not having any ARP table entries is a big hint that your NIC isn't able to
> communicate on the network due to bad wiring, a bad NIC, a bad driver, or
> bad autonegotiation.
>
> Are you using a switch or a hub?  What does "dmesg | grep eth" say on each
> machine?  If one of them says something like "eth0 NIC Link is Up, 100
> Mbps full duplex" and all of the others say "half duplex", you could have
> a problem.