I think HSRP could really handle this well - but with redirect - I haven't tried this,
but... :
static route out T1, floating static to other router, so it is only in the route table
when the T1 goes down, if it sends out the same interface it will forward the
packet & send back ICMP redirect. So far, easy.
On the router with the DSL, static route to the other end of the T1 (don't use ip
address of next hop, use the same ip address for this static route to the T1 in the
router that has the T1). floating static out the DSL. the router will do a recursive
lookup & send to the router with the T1 when the T1 comes back up & send back
ICMP redirect. When the T1 is down, the recursive will fail & the DSL route is
used.
And of course, the exercise is only useful if the IP stack on the client can do
something useful with the ICMP redirect. To my knowledge, some stacks will
just happily keep sending to thier default gateway. In this case, just the 1st router
config handles that.
>>> John Neiberger <[EMAIL PROTECTED]> 08/29 11:23 AM >>>
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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