Date: Wed, 22 Aug 2007 08:32:41 -0500 From: Josh Paetzel <josh@tcbug.org> To: freebsd-isp@freebsd.org Subject: Re: Using FreeBSD as a router Message-ID: <20070822133241.GB83613@tcbug.org> In-Reply-To: <20070822125432.GB58627@schumacher.dk> References: <20070822080112.GA58627@schumacher.dk> <46CC1E6E.9080701@tomjudge.com> <20070822125432.GB58627@schumacher.dk>
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[-- Attachment #1 --] Steffen Schumacher wrote: > On 22.08.2007 12:30:54 +0100, Tom Judge wrote: > > Steffen Schumacher wrote: > > > > Firstly this address is not a valid host address it is a network address. > > as shown by the routing entry below. Secondly your default gateway must be > > on your local network segment to work however 195.249.0/16 is behind the > > router 131.164.191.1. > > > > 195.249.0/16 131.164.191.1 UG1 1 12 vlan7 > > > > Perhaps your default gateway should be 131.164.191.1 ?? > > > > Yes - ultimately that should be my gateway, but I want FreeBSD to realize > this by looking at the 195.249.0/16 route. > The thing is that 195.249.0/16 will also be seen from 131.164.191.2 but with > a lower localpref, making 131.164.191.1 the best choice. This way if .1 dies, > 195.249.0/16 should be routed towards .2, and ultimately my default should go > at .2 also. > This is the goal - to make the default move to .2 if .1 is dead, and back when > 1. comes back up again. > > I don't think it matters if I use 195.249.0.0 or 195.249.1.1, since the router > receiving the packets will do their own routing lookup. Whats important is only > getting the next-hop mac/if for the default route, and that should be available > from the 195.249.0/16 route. > > /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. There are a lot of hacks people use to get around this, some of the are of the 'ping this ip periodically and if it goes away swap the default route' nature. You could also investigate running CARP/HSRP/VRRP/GLBP on these two gateways so they can sit on the same IP, thus obliviating the need to change the default route at all. I've never actually tried getting FBSD to grap it's own routing information from a routing protocol but it's possible you could go down that route as well... -- Thanks, Josh Paetzel [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.3 (FreeBSD) iD8DBQFGzDr5JvkB8SevrssRAjR8AJ45G247dD/SgoltC+ovsO112H52zQCePO1r gciAbkLm/TQetbmPwC1wNFQ= =6J/Y -----END PGP SIGNATURE-----home | help
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