I wanted to be doing a netstat -ani, (-g only shows multicast for ipv4/6), but the result is the same. None of the DECnet multicast addresses are being added, most notably (and absolutely necessary) are: ab:0:0:3:0:0 - type 6003 - for DECnet Phase IV end node Hello packets from each host, and ab:0:0:4:0:0 - type 6003 - for DECnet Phase IV router Hello packets from the router. I've tried adding these with both enaddr from KLH10 and FreeBSD's built-in "mtest", but both return errors. This seems to be a FreeBSD-specific problem which so far I'm unable to find the reason for. Mark Mark Abene wrote: Mark Abene wrote: I've actually made a new discovery... looking at "netstat -g", I'm seeing that none of the multicast addresses exist that DECnet uses and requires! This would explain why I don't see any DECnet traffic at all. I compiled KLH10's enaddr utility in an attempt to add the multicast addresses manually, and I get failures for all attempts... "SIOCADDMULTI failed - Can't assign requested address". My server's kernel wasn't built with multicast routing enabled, which is not a default. I'm wondering if this is the cause of the error. I'm going to do some further testing. Regards Mark Well I was mistaken about the multicast routing, that's only for doing DVMRP with mrouted (MBONE, etc). Local LAN multicast should work "out of the box" on FreeBSD. Still trying to track down why this is failing, since it's my primary candidate for DECnet not working...