On 2014-05-24 21:44, Hans Vlems wrote: Try modifying one of the 08-00-2B addresses, say into -AA-BB-01 Will not make any difference, as already discussed... If I were to guess, there are packets dropped. I would start by checking various counters on the two nodes to verify this. DECnet performance can hurt a lot if many packets are dropped. The occasional packet is handled fine, but a more generic and systematic packet loss can cause DECnet to behave very pathetic. Johnny Verzonden vanaf mijn BlackBerry 10-smartphone. Origineel bericht Van: Jean-Yves Bernier Verzonden: zaterdag 24 mei 2014 21:40 Aan: hecnet at Update.UU.SE Beantwoorden: hecnet at Update.UU.SE Onderwerp: Re: [HECnet] Same MAC address on different nodes At 11:35 AM -0400 24/5/14, Brian Schenkenberger, VAXman- wrote: However, that does not explain my erratic file transfers :