On Mon, Jun 07, 2004 at 10:44:03AM +0200,
 Stephane Bortzmeyer <bortzmeyer@nic.fr> wrote 
 a message of 14 lines which said:

> I want to debug a network program when it encounters problems
> (timeouted connections, delays, etc). So I need to be able to
> configure an interface with things like "drop 50 % of packets
> directed to port 80".

Well, apparently, there is no NetBSD solution so I installed FreeBSD
on the test machine. It works well with the "dummynet" interface.