RH 8 and 3C905C problem

[richgill]

I have a windows PC connected to an ADSL router. To connect to the internet the router performs NATing and acts as a DHCP server. So windows is simply set to DHCP with no other settings (and no client software etc).

I have just set up a PC with RedHat 8 and am trying to connect to the same router. The network card is a 3COM 3C905C which (as far as i can tell from the RH web site) is supported. For some reason the card cannot see the router. If I manually set the IP address (192.168.1.2) then the interface eth0 comes up ok and I can ping 127.0.0.1 & 192.168.1.2 but if I try to ping the router on 192.168.1.1 I get destination network unreacheable.

Any ideas? I might try connecting the both the RH PC and the Windows PC to a hub and see if I can ping each other.

 

[sleipnir214]

What are your subnet mask and network settings on that NIC? ______________________________________________________________________
TANSTAAFL!

 

[richgill]

ip 192.168.1.2
sm 255.255.255.0
gw 192.168.1.1

If I try to use DHCP instead there is a warning about the NIC at boot time. (something like check the cable)

 

[RiezalR]

Read this thread. Maybe it might help. thread619-399213. Also check any router configurations you might have.

 

[richgill]

Thanks! I already read that thread - I think this is different. Just noticed that the card is a 3C920 (apparently the same as a 3C905C). Don't know if that makes any difference. Wonder if I have IRQ problems! I'll have anoter look tonight.

 

[richgill]

The problem was fixed by sticking a mini-hub in between the linux PC and the router. Anyone know why? A PC running Windows did not need the mini-hub!

Now to play around with RedHat 8...

 

[sleipnir214]

A "straight-through" 10baseT cable is used to communicate between a hub and a NIC only.

If you are going to communicate NIC to NIC, you need a "half-twist" cable. It could be that the cable going to Windows machine is half-twist. Does it work through the hub? ______________________________________________________________________
TANSTAAFL!

 

[richgill]

The ADSL router is really a router/hub so you need a straight through cable - as you say. The windows PC can connect via a mini-hub or directly attached to the router/hub but the Linux PC only via the mini-hub. (Yes - I did try using cross over cables to check I wasn't going mad!!)