On 22/12/11 17:58, Marc Chametzky wrote: Interesting. Could anyone grab a bunch of frames with tcpdump and send to me? Here's the output from a tcpdump while doing a "MCR NCP TELL MIM SHOW EXEC". I did some reverse engineering of Multinet IP protocol for DECnet-Linux. The code is in CVS here http://linux-decnet.cvs.sourceforge.net/viewvc/linux-decnet/dnprogs/multine… It's not perfect (or even good) but it might be a starting point for you. Chrissie