I'm a newbie Linux user and I can't get the ethernet card activated.
I really would appreciate any help, and please advise in a way that I can understand you.

I am using Fedora Core 4 and I have a network card D-Link DE-530 (DECchip 21041 I think). My computer is behind a DHCP router. There's a Tulip driver on my computer installed.

I don't know what information you need, so I'll put some outputs here (logged in as root):

> modprobe tulip
[no output]

> ifconfig eth0 up
"eth0: unknown interface: No such device"

I can't find /etc/sysconfig/network-scripts/ifcfg-eth file. Should I?

In /etc/modprobe.conf file I have this line first:
alias eth0 tulip

> lspci
"[some output lines]
00:10.0 Ethernet controller: Digital Equipment Corporation DECchip 21041 [Tulip Pass 3] (rev 21)
[some output lines]"

> lsmod | grep tulip
"tulip 55393 0"

I hope those outputs give some information. I will gladly print more outputs if you tell me the commands I should use.

Thank you for every piece of an advise!

According to kernel documentation, the older DEC chipset (dc2104x) requires a driver different from normal tulip drivers. Make sure you enabled it in the kernel configuration. If it is a module, it will be called
Also, you can do either of to list the valid interface devices (even if they are not up/configured).