> You do see that the netbsd dhclient-script (as it stands today) needs
> a little bit of work for NetBSD 6.0 compatibility, correct?

=> NetBSD in general: I've checked on a NetBSD 5.1 VM, ifconfig
had the same parameters...

BTW the script is not included in the pkgsrc isc-dhclient package,
I have no idea about it could work.

(note an engineer took the ticket so he should address the problem)