Well, it's true, there is really no way for them to know that the link came
back up. However, depending on the host, there is also no guarantee that
they will ever heed the redirect in the first place. You really cannot count
on them for fault tolerance.
An HSRP solution would probably work better in this scenario. The hosts
would all send to the virtual IP address, which would be served by the
primary router (with the T-1 interface). With interface tracking enabled, if
the T-1 link fails, the secondary router (with the DSL connection) would
take over and the hosts would not need to know anything about it. When the
T-1 link comes back up, that router will become primary again and will take
over traffic sent to the virtual IP address. Again, the hosts need know
nothing about this.
I hope this helps...
Dale
[=`)
>From: John Neiberger <[EMAIL PROTECTED]>
>Reply-To: John Neiberger <[EMAIL PROTECTED]>
>To: [EMAIL PROTECTED]
>Subject: ICMP Redirects
>Date: Tue, 29 Aug 2000 11:23:42 -0700 (PDT)
>
>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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