Connecting to LAN

[�ystein Folkvord]

Hi!

I am using redhat 5.0, and I am trying to connecmy box to the LAN.
However, I get some stupid error message when I try to use ifconfig, and I
wondered if any of you could tell me what this means 

[root@bernt /root]#ifconfig eth0 129.0.0.0 netmask 255.255.255.255 up
SIOCSIFADDR: Operation not supported by device
SIOCSIFNETMASK: Operation not supported by device

(yes, the ip's are not the ones I use)

I am using Kernel 2.0.32 if that can help. 

Is there anyone who knows anything about this  ?

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