network cards

Hi! I have still problem with swaping eth0 and eth1 in SuSE 9.3 when i restart computer. I have 3com which is eth0 and i use for the Internet and D-Link which is eth1 and i don't use yet and is not connected. On each start of computer is different: once is 3com eth0 and next time eth1 but Internet works. What is wrong? Every time i must reconfigured KNemo... Thanks, Mitja