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Linux Network Failover

Ok, I have a linux box and two broadband ethernet connections, one bellsouth and the other comcast.  

I want to set the firewall up so when comcast(eth1) goes down, it uses bellsouth(eth2). (eth0 will be internal)  When comcast comes back up it switches back.  

I can do it the "hokey" way and write a bash script that runs every 5 seconds to see if the internet can be reached on eth1, and if not switches to eth2.  But I don't want to do it the hokey way.  I'm looking for a daeomon to do this, or a project that's modifying IPTables to do all this or something a little less fragile than my cheesy bash scripts.

Anyone know of any projects doing this?

And bonding the two would be awesome, but I think that's not going to be feasible with 2 seperate isp's.

Thanks
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bennybutler
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bennybutler
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naccadCommented:
you might want to look at some linux based BGP implementations, i know of one, zebra from http://www.zebra.org.

tc
-nick
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bennybutler:
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