On October 22, you wrote:

Today I multihomed a customer using only two disjoint PA spaces.

PA1 PA2 P1---=---Wall---=---P2 | ------ RFC1597 | Server

so is anything in the above picture directly addressable through the wall?...and paul you mean rfc1918 right? ;)

I did this whole thing with an almost-stock BSD/OS 2.1 system (other than the "socket" command which is off the net from way back.)

server...?...just do the nat with your cissssccoooo... http://schizo.digex.net Easy to install, and it works....if people will want to use it....thats a different matter... Id like to hear opinions on this at nanog if people have any..

So don't let's talk any longer about multihoming requiring PI space.

Either way...firewall or just with the router..you are correct. Ed