sushi:~/simh morrison$ ifconfig en1
en1: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500
        inet6 fe80::217:f2ff:fe43:4550%en1 prefixlen 64 scopeid 0x5 
        inet 192.168.1.101 netmask 0xffffff00 broadcast 192.168.1.255
        ether 00:17:f2:43:45:50 
        media: autoselect status: active
        supported media: autoselect
sushi:~/simh morrison$ sudo bin/vax

VAX simulator V3.6-1
sim> load -r ka655.bin
sim> set cpu 64m
sim> set rq0 ra92
sim> at rq0 netbsd.dsk
sim> set xqa mac=00-17-F2-43-45-50
Non-existent device
sim> set xq mac=00-17-F2-43-45-50
sim> show xq
XQ, address=20001920-2000192F, no vector, MAC=00:17:F2:43:45:50, type=DELQA, poll=100, not attached
sim> at xq en1
Command not allowed
sim> at xqa en1
Non-existent device
sim> at xq0 en1
Command not allowed
sim>