Date: Sat, 27 Dec 2003 16:28:09 -0500 From: Barney Wolff <barney@databus.com> To: mark abrams <mabrams@video-collage.com> Cc: net@freebsd.org Subject: Re: net access failover Message-ID: <20031227212809.GA11242@pit.databus.com> In-Reply-To: <6.0.0.22.2.20031227155203.02738df0@10.222.222.77> References: <6.0.0.22.2.20031227155203.02738df0@10.222.222.77>
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On Sat, Dec 27, 2003 at 03:57:16PM -0500, mark abrams wrote: > > I have a cable modem and and a dsl connction to my machine. I would like to > use the cable modem as my default connection and automatically fail-over to > the dsl connection if/when the cable modem goes down. > > Can routed(8) do this ? If so how? And is there a better way ? I guess this should be a FAQ. For something that can be adapted to do what you want, see http://www.databus.com/dslsec.tgz . routed won't do it because (unlike real multihoming) your address on the two networks is different and the ISPs are not sending you any routing protocol packets. A simpleminded ping of the cable ISP's router, and changing the default route when it goes away and comes back, should work fine. NATing adds a little to the effort, if you do it. Existing connections will not survive a transition, but that's usually not a big deal. -- Barney Wolff http://www.databus.com/bwresume.pdf I'm available by contract or FT, in the NYC metro area or via the 'Net.
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