On May-19 13:55, Dan Ritter wrote: > 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-
Hi Dan, Thanks for your reply. Finally I got a sysadmin who went to the co-location center and checked a few things.. He replaced the cable, changed switch ports etc, without success... I still had no link detected unfortunately. That guy installed a Win 2022 server and configured that sswitch port without touched anything and the port worked immediately. I re-installed the Debian 12 and checked the link with ethtool and still had no link. I configured an IP in the ens2f1np1 anyway and what happened? It worked .. :( I thought that there should be link even if there is no IP configured... Lesson learned. Thanks, Misi
