> While I'm at it, it'd be nice to set up some kind of incoming packet
    > filtering.  I hear morningstar PPP can do it but I don't know of anything
    > else that can.
   
   Lots of people use Darren Reed's IPFILT package.. not sure where it's
   available offhand but he maintains it to -current if I remember correctly.
   There are other filtering addons too that I can't remember offhand.

ftp://coombs.anu.edu.au/pub/net/kernel
http://cheops.anu.edu.au/~avalon/ip-filter.html

are the 2 url's that i remember for it.