VAX 4000 panel bulkhead compatibility?

As I mentioned earlier I've got a BA213 "MicroVAX 3400" that has had its CPU upgraded to a KA660 (VAX 4000/200). I'm trying to get networking working. I have available MULTINET and UCX as software, currently Multinet is installed under a 30 day evaluation PAK. @MULTINET:START_MULTINET runs but MULTINET CHECK claims that my default router is unreachable. EZA0: is plugged through an ethernet tranciever into a hub. I've tried the SQE switch on both positions (I can never remember if hubs _want_ heart beats or not). I have two other systems connected to that Hub, one a VAX 4000/300 with VMS/Multinet and one a Vaxstation 3100/M76 with NetBSD. I can telnet to either of them from the main network so I'm pretty sure the hub is working. Q1: Is the CPU "bulkhead" for the 4000/200 compatible with the CPU bulkhead for the 3400? It is the "one ribbon cable" variety (rather than the two cables the the KA630,50,and 55 use) Q2: Which way _should_ the SQE switch be set? Q3: Does Multinet do Echoreply? Pings seem to fall into a black hole. --Chuck