I have a 2821 router that gets a public ip via DHCP. I've got some rules in place that somehow have managed to block icmp from the cmd line on the router. Internet on devices works fine though. I noticed if I add "ip route 0.0.0.0 0.0.0.0 gigabitethernet 0/0" which is the WAN interface ping works. However it gave me a message when I added it %Default route without gateway, if not a point-to-point interface, may impact performance.
What exactly does that mean? should I leave it or take it off?
Thank you
