I am suffering a strange problem with a Cisco 851 router on my network.
Exactly 7 hours to the second, the Fastethernet4 port stops accepting traffic. The router is still alive on the LAN side the network still functions and you can still access the router software.
I have a 10MB SDL connection entering the router on the Fastethernet4 port and 4 connected clients underneath. The Router performs perfectly with good throughput for exactly 6 hours 59 minutes and 59 seconds then internet connectivity is lost.
After a power reset, the router again performs perfectly for another 6 hours 59 minutes and 59 seconds etc etc.
If I decide to reset the router after 3 hours, then the 7 hour stint starts from this new point but always lasts 7 hours which rules out most external influences.
I would be grateful for any ideas anyone may have to solve the problem as I am about to take a coal hammer to this otherwise unassuming black box.