> +---+ +---+ +---+ +---+ > | A +---(x)---+ C +---(y)---+ D +---(z)---+ B | > +---+ +---+ +---+ +---+ > > A knows about network x. > C knows about networks x and y. > D knows about networks y and z. > B knows about network z. > > C does /not/ know about network z. > D does /not/ know about network x. Yes you're correct.. I should stop assuming things that I already figured out in my head but don't write down when replying. (Actually, a "few" emails ago I wrote an email that describes the exact same as the above -including art- but I discarded it when I saw your answer which was even more complete.) > We have already covered the IP forwarding in another email. As far > as the firewalling is concerned, you are correct. However I believe > Daniel said that there was no firewalling (yet). Nope, there was no word about firewalling, just NAT and routing. > Agreed. I think both are likely good ways to learn about > firewalling, specifically IPTables. Seeing as how this > discussion is about routing... We started with NAT, which is something that netfilter can do and what the tutorial also describes, and routing. I was hoping that Daniel would see why he didn't need NAT by reading it. Daniel, this is getting lengthy and I think everything that needed to be said has been said about NAT and routing. I hope things are (more) clear now. Grts, Rob -- To unsubscribe from this list: send the line "unsubscribe netfilter" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html