HSRP didn't even occur to me, but since the DSL router we're using is a 675
that can't do HSRP, that isn't even an option. Bummer! That would have
worked very well in this situation.
Thanks
John
>
> 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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