We use Orion for a monitoring server and I had a situation this morning. One of my routers stopped responding, at least from the monitoring servers perspective. I could ping the router's inside interface from my laptop, but I couldn't get to it from the monitoring server itself. I checked the routing table on the server and everything looked normal. I could ping devices behind the router (APs/switches) and I could ping the serial side interface from the monitoring server, and I could ping the inside interface from my laptop. I removed "no ip redirects" from the inside interface and I could then ping from the monitoring server.
Here's the way it would look:
Orion ----> <site Serial side><Inside IF> ---> other devices.
I could ping serial from orion, but not inside IF. Any ideas? I'm about to disable redirects on all serial side and inside interfaces, but I wanted to make sure this was just a fluke and not a cause of having redirects configured on that router.