I have intel PRO/gigabit pci ethernet board, and I wish to run at full 1000Mbit/second speed.however, when I load e1000 module and get address from dhcp it connects only at 100Mbit/second speed.

I know from router configuration(is a gigiabit router, other gigabit hardwares work OK at full gigabit speed) that it is only connecting at 100. if I perform:

insmod e1000 Duplex=2 Speed=1000

as suggested in e1000 Docs, ethernet does not work at all.

Does anyone know what problem this is? Thank you in advance.

edit: sorry i forgot some details, kernel version is 2.6.10-rc1 and various other earlier 2.6 kernels, all have same effect. I have not access to the system currently until tomorrow afternoon eastern so no lspci right now.

anyone suggestions?

If forcing the speed to Gigabit makes it not work (btw, what are the log messages here?), then it's quite likely that it's negotiating a speed of 100Mbps because external noise is preventing it from operating any faster.

This could be a cable (shielding or length) issue, or another hardware problem with the NIC. Have you tried using it in another computer with the same cable?

You might also try Duplex=1 Speed=1000; that might give you a half-duplex gigabit connection (roughly 500MBps each way on a symmetric load). If that works, then it's even more likely to be an interference problem.

You also didn't say if you're using fibre-optic or metal cabling.