I have a Cisco 1721 router. The S0 int. connects to my intranet 192.168.104.1
The Fa0 int, connects to the internet. Is it possible to get the router to detect if the internet goes down to redirect the traffic back out the S0 port to another router in the network that has a separate internet connection?
Any suggestions and configs would be greatly appreciated.
You mean when the interface goes down, right? Or the device connecting to the fa0 goes down? You can do floating static route pointing the serial interface with a slighty higher distance metric than the route to fa0 if and when the interface fa0/1 ever goes down.
So your fast-E interface is on the outside and your Serial is on the inside? Hmmm...perhaps turning on keepalives and simple interface line protocol tracking might work; something like:
track 1 int fa0 line-protocol
...then run HSRP between your two routers' inside interfaces; I've never done it across serial interfaces, but as long as they are layer-2 adjacent, I would think it would work; something like:
standby 1 priority 105
standby 1 track 1 decrement 10
...the other router would look similar, except for the real IP of course. You can choose to track its outside interface or not. Better yet, if both links are available, asymmetric routing is of no concern and there are many inside hosts going out to the Internet, look into GLBP instead of HSRP.
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