Whilst on ifconfig, reading the man page it can be used as follows:

     ifconfig interface address_family [address [dest_address]] [parameters]

If I do this:

# ifconfig cs0 inet 192.168.1.7 192.168.1.5

then I end up with this:

...
        inet 192.168.1.7 netmask 0xffffff00 broadcast 192.168.1.5
...

now not only did I not want to supply a broadcast address, but as I
understand the man page, unless I said "broadcast 192.168.1.5" then
it should not have been set.

What I did want to do was configure an ethernet cable as a PPP device
by virtue of it being a crossover cable to another device.

Also, does NetBSD do proxy-arp in the kernel ?

Darren