> I forgot to describe my actual problem.  What is happening is that I
> have bougt myself an internet connection through cable modem, and the
> ISP assigns IP adresses dynamically.  Therefore I have setup NetBSD
> to obtain IP as a DHCP-client.

Are you sure you should be using DHCP?  A lot of "high-speed" providers
use PPPoE.  (It seems to be more popular among the DSL ones than the
cable-modem ones, but you never know.)  The symptoms you describe sound
a whole lot like what I'd expect if there's no DHCP server listening.

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