Cisco WAN :: 881 Loses Internet Connectivity When Cable Disconnected

Jan 10, 2011

ATTACHED: My current running config with sensitive info taken out.
 
I have a Cisco 881 Router connected to cable modem.  The router is running IOS 15.1.
 
I have it configured exactly the same way as an 877 router running IOS 12.1 which does not exhibit the problem.  Just a standard LAN/WAN config with basic routing/firewall.
 
When the internet connection is lost for any reason and then re-established the router will no longer pass internet traffic unless I reboot the router.
 
I used Cisco Configuration Professional to configure the router.  The key setting seems to be the Router Static Route.  We have a static IP and I set static route with the "make this the default route" checked.  Then I set forward (next hop) to the IP my ISP gave me as their gateway.
 
This is exactly the same way I set the 877 router using the same ISP but in a different office.
 
Every so often the internet is lost due to power outage or the ISP doing something on their end and every time that happens we have to reboot the router which is quite annoying.
 
I did not have the "permanent route" check mark checked but I do not have it checked on the router that does not have the problem either so I don't think that's it. 
 
When I set the static route to "interface" then added the static IP of the next hop it will continue to work for incoming connections but not outgoing.

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[Code].....

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