I have a cable-internet connection that works fine in Windows XP using dhcp.

command "lspci" tells me:
"Ethernet controller: Realtek Semiconductor Co., Ltd. RTL-8139/8139C/8139C+ (rev10)"
(which is correct)

command "ifconfig eth0 up" followed by "pump -i eth0" says "Operation failed".

command "netcardconfig" also fails.

What else can I try?