I'm having problems with two cisco 857 routers. They are used to provide internet access to our network.
Yesterday, there was a problem in our network, I'm not sure what happened, but everyone lost internet connection, and I couldn't ping the router. I switched to the backup router, and this worked for about 10 minutes, but then the same thing happened to that.
Both routers looked OK - the CD, PPP and VPN lights were on solid, but I couldn't ping the IP address of either router, even when connected directly to it.
I restored the config onto a new router, and this fixed the problem in both cases.
I have connected to the faulty routers using the console, and everything appears fine, but I'm not really sure what to look for to locate the fault.
Can anyone help?