I'm trying to implement a backup solution for my Internet connection. Right now, I have all my Internet bound traffic going to my Comcast Internet connection through a PIX which is connected to my Cisco 2811 router's fa 0/1. My WAN traffic is headed out a serial T1 connection. Our Atlanta office has an Internet connection that we use as a backup. The current config goes like this.
All WAN traffic is forwarded out the WAN interface, and the default route 0.0.0.0 0.0.0.0 is pointing to Comcast. A static floating route exists that points to the WAN interface, so if I unplug the fa 0/1 (router to PIX connection) all the traffic that would normally go to Comcast, is now re-routed to Atlanta and the Internet successfully. However, the problem is when I take the Comcast cable modem down, the 2811 still sees the fa 0/1 interface as up and forwards Internet bound traffic its way, which of course is now a dead end. I've looked at HSRP, but it seems like that wouldn't work here since it involves making 2 gateways appear as one. I want Internet bound traffic to head toward Comcast unless it is down, and of course I can't send WAN traffic toward Comcast. Does anyone have any ideas for this scenario?
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