I've recently gotten hold of a couple of gigabit network cards, and as they're both fibre cards and I have no experience with fibre, I could use some advice!
The cards are both Intel PRO/1000 (82542 chipset) and I'd like to use the cards to connect two servers directly together. They'll be less than a metre apart, and the cable I'm using is about two metres long, with "SC" connectors on both ends (which according to intel.com is what the cards use.)
I figured connecting the TX port on each card to the RX port on the other would be enough to get a link, but the OS reports no link detected and the link LED on the cards doesn't light up.
Carefully checking the cards reveals a faint point of red laser light shining out of one of the ports (I assume the TX port, as they're unmarked) so the cards seem to be okay. Shining a light into one end of the fibre shows bright light coming out the other end, so the fibre cable seems fine. Despite this I still can't get a link.
A suggestion on this newsgroup in the past was to connect the TX port of one card back to its own RX port, as that should cause a link to be established - but unfortunately this doesn't make a difference.
Drivers should be fine (widely used "e1000" module under Linux 2.6.16) so I'm running out of ideas. Does anyone have any idea what the problem could be, or anything I could try to narrow down the problem?