We have recently set up a small cluster of GPU workstations and have recently got them networked together. Although connectivity looks fine for e.g. web browsers and SSH, pinging other addresses results in what looks like a duplicate packet (DUP!) with every ping it does. We have set everything up ourselves, so I wouldn't be surprised if it is an issue with settings... and while it could be a hardware issue, I doubt this somewhat.
Does anybody have any idea what's going on? I've looked this up online and it seems others have had this problem, but I didn't find any clear answers (I could have looked more, I suppose). Suggestions on how to get more information are also appreciated... maybe I should run a traceroute? I am utterly clueless.