We have a situation where ICMP redirects might be very helpful, but I have a
practical question about them. In our situation, we'll have two routers
connected to a switch, the first having a T-1 connection, the second being a
backup router with DSL. All PCs will have the main router as their default
gateway. If the main circuit goes down, that router should send ICMP
redirects to the PCs to divert traffic to the other router, right?
If that's the case, how do the hosts know when the main circuit comes back
up? I don't see how there would be any way for them to know to resume
sending traffic to the original default gateway. The way I see it, when the
main line goes down the hosts would start to use the DSL route, and would
continue to use that route even after the main route becomes available.
any thoughts?
TIA,
John
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