Strange network problem

[Gerald Combs]

Brian Densmore wrote:

> /etc/modules file and now sound works. Did the same thing for the network
> card, but even though it comes up and has link and autonegotiates I have
> no connection to my LAN. The hub shows the card as up with link in 100MB full
> duplex. The card seems to working by observing the lights. Ifconfig shows the card 
> as up, working and assigned the proper IP. The only thing that happens if I 
> try pinging the gateway is I see the TX count go up. So I installed my old 
> nic and I get the same thing. I've also tried running knoppix from cd and still
> the same problem. I haven't changed the cable yet or tried my laptop
> on that connection yet, so there is the possibility something is wrong with 
> the cable. Anyone have any other ideas? The PC was working fine before I
> disconnected it and did the upgrade.

Do you have "mii-tool" or "mii-diag" on your system?  If so, do they
show something like this?

rufus:/home/gerald# mii-tool -v eth0
eth0: negotiated 100baseTx-FD, link ok
  product info: Intel 82555 rev 4
  basic mode:   autonegotiation enabled
  basic status: autonegotiation complete, link ok
  capabilities: 100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD
  advertising:  100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD
    flow-control
  link partner: 100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD

You might also check:

  - Your netmask.

  - The output of "arp -an" (e.g. do you see anyone else's address)?

  - Your routing table ("netstat -rn").

  - If you run tethereal/tcpdump on your machine, find out if you're
    seeing any other traffic on your network.

  - If your gateway is so inclined, show its ARP table, or run
    tethereal/tcpdump to see if anything from your box is making it to
    the gateway.