[LARTC] Need information on multi-homing

[bruce@perens.com (Bruce Perens)]

Is there a multi-homing FAQ? I've not been able to find it.

Here's my system's configuration:

	eth0:	SDSL at 216.15.108.186 (dnai-net)
	eth1:	ADSL at 67.114.175.138 (sbc-net)
	eth2:	DHCP network at 192.168.1.1 .
	lo:	127.0.0.1

	There is a firewall box acting as the DHCP server and router for the
	systems on the DHCP net. The Linux system doesn't run DHCP or
	masquerading.

If a connection is accepted on the IP address of one of these interfaces,
I'd like its packets to go out on the same interface. If there is a failure
on the path to eth0, connections to eth1 should continue to work, and vice
versa. But right now, eth0 has the default route and just about every packet
goes out of eth0 regardless of what interface they come in. So, I tried this:

	ip rule add from 216.15.108.186 table dnai-net 
	ip rule add from 67.114.175.138 table sbc-net
	ip route add default via 216.15.108.186 dev eth0 table dnai-net
	ip route add default via 67.114.175.138 dev eth1 table sbc-net

This doesn't work. I get a destination unreachable if I try to follow either
route. So, what am I doing wrong?

	Thanks

	Bruce Perens
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