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Posted by on May 28, 2008, 7:08 am
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> Good afternoon everyone,
>
> I am having trouble setting up a simple failover configuration.
>
> We have 2 connections (one is Fiber @ 10Mbit, other is ADSL @ 6Mbit).
>
> The Fiber usage is expensive, so for client usage I was looking at
> using our ADSL as a base, but failover to the Fiber if the DSL
> disconnects / goes down. My servers are running on other routers, so
> this router is strictly for client NAT.
>
> The problem:
> If I start this configuration up fresh it works. The system will NAT
> through the ADSL connection and all is well. I then do a =93shutdown=94 on=
> Dialer1. It continues to work fine and automatically switches to the
> Fiber connection. I then do a =93no shutdown=94 on Dialer1 and the whole
> thing stops working. The ADSL connection gets an IP, but something
> seems to be messed up with the NAT part. I can=92t even traceroute from
> the router. Everything times out.
I am not sure what might be causing the problem I doubt
it will be with NAT unless it is a bug.
- however
I think that you will need a more sophisticated solution.
=46rom memory a dialer is *always* UP. Unless admin down of course.
So your solution will not work.
I may be wrong, unplug dsl and see if dialer is up to check
sh ip int brie
Look at Policy based routing with Object Tracking.
http://www.cisco.com/en/US/tech/tk364/technologies_configuration_example0918=
6a0080211f5c.shtml
This has got the tools for the job.
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