Mihaly Zachar wrote: > I have never used fibre connection yet. Now I got a server where the HW > (Dell R440) and the network connections are provided by others, my task > is to install a Linux on it. > > I installed a fresh Debian 12, the built-in NIC (BCM5720) is working, it > also can see the BCM57412 card ports, but I have no link for some > reason. > > > Here are the relevant outputs: > > https://pastebin.com/ghbSySfC > > As you can see, there is no link detected unfortunately, one of them has > unknown speed, the other can see that the speed is 10000Mb/s. > > Additional information can be that the server is connected to a fibre > switch, wich is used by several other Windows boxes. > > They used the very same fibre cable (LC/UPC - LC/UPC - MM - DX whatever > it means). > > What do I miss here?
ens2f0np0 doesn't have a fiber optic cable plugged in. ens2f0np0 won't work until someone plugs a new cable into it. ens2f1np1 has a cable plugged in, but no link detected. ens2f1np1 won't work until the switch on the other side turns it up. fiber cables are very easy to damage and fairly easy to accidentally not plug in completely. -dsr-
