>How does one get these babies to work on NetBSD?
>
>I have bpfilters set in the kernel (8). When I run tcpdump
>I get:
>
>tcpdump: /dev/bpf0 No such file or directory

Sounds like you don't have the devices in /dev.  You should be able to go
into /dev and say something like "MAKEDEV bpf0".

(I use tcpdump all the time under NetBSD, so I'm 100% sure it works).

--Ken