Date: Fri, 24 Aug 2007 23:16:25 +0200 From: Sten Daniel Soersdal <netslists@gmail.com> To: freebsd-isp@freebsd.org Subject: Re: Using FreeBSD as a router Message-ID: <46CF4AA9.6020803@gmail.com> In-Reply-To: <20070822143513.GB66643@schumacher.dk> References: <20070822080112.GA58627@schumacher.dk> <46CC1E6E.9080701@tomjudge.com> <20070822125432.GB58627@schumacher.dk> <20070822133241.GB83613@tcbug.org> <20070822143513.GB66643@schumacher.dk>
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Steffen Schumacher wrote: > On 22.08.2007 08:32:41 -0500, Josh Paetzel wrote: >> Steffen Schumacher wrote: >>> On 22.08.2007 12:30:54 +0100, Tom Judge wrote: >>>> Steffen Schumacher wrote: >>>> > [cut..] >>> /Steffen >> "You keep using that word. I do not think it means what you think it >> means." >> >> In FreeBSD the default route is a directly connected host that it can >> send packets to that it doesn't have a specific route to. It's not >> going to 'figure out' a default route from a network address. >> > Ok, I'll try to elaborate what it is I'd like: > For each route a 'router' must have some next-hop information, so that > it knows how to forward traffic for that prefix. Typically the interface, > and possibly a layer2 address (mac for ethernet) if such exist. > Normally (virtually all the time) static routes are directed at connected > hosts, just as you explain. This way it is simple to get the next-hop > info, because it is the same as for that connected host. > > What I would like is for the router to realize the configured next-hop > isn't a directly connected host, and as a result attempt to lookup that > host to see if we have a route for the next-hop address. If we do, then > we use the next-hop information from this second lookup and use the > next-hop information for the original route. > This is what I mean with recursive route lookups. > > 1. normal lookup > 0/0 -> x. > x/30 -> fxp0. > => 0/0 -> mac of x via fxp0. > > 2. recursive lookup > 0/0 -> y. > y/16 -> x/30. > x/30 -> fxp0. > => 0/0 -> mac of x via fxp0. > > Hope this clarifies, but it does seem there is very little support for this. > Does anyone know the whereabouts of this in the FreeBSD code? > I don't think freebsd supports recursive routes but it's been too long since i tried and that may no longer apply. I think i read a discussion on one of the lists (possibly -net) that such functionality should be performed by a routing daemon and not by the kernel. Maybe you could find the clues in the archives? -- Sten Daniel Soersdal
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