This is strange, on Fedora Core 1, mii-tool does not modify the card behavior for my 3c59x adapter anymore. It's stuck in 10baseT-FD mode, but should easily support 100BaseTx-HD (or FD, but I'd be happy with HD). here's the command output: [root@xxx /root] mii-tool --force=100baseTx-HD [root@xxx /root] mii-tool --restart restarting autonegotiation... [root@xxx /root] mii-tool -v eth0: 10 Mbit, full duplex, link ok product info: vendor 01:e1:c1, model 56 rev 7 basic mode: isolate, collision test, 10 Mbit, full duplex basic status: autonegotiation restarted, link ok capabilities: advertising: 100baseT4 100baseTx-FD 100baseTx-HD flow-control link partner: 100baseT4 100baseTx-FD 100baseTx-HD flow-control Any help is much appreciated. Regards, Joseph