In some email I received from David Jones, they wrote:
> 
> > I hear there are patches that can do ip filtering 
> > on netbsd; can someone tell me more?
> 
> I am working on a firewall filter system for NetBSD.  I still need
> to add a few things before it's ready for public consumption.

I've written one myself, but it doesn't use the inbuild BPF and not
really worthwhile where BPF is available.

Someone mentioned they had already written one to use BPF and had some
patches ready ?

darren