So here's the network:
Lots of local users, 192.168.12.x. Users are given an IP thru DHCP, and their default GW is 192.168.12.254. The 254 addy is a Cisco 3560G switch. In the configs of the 3560, we have a line that says
ip route 0.0.0.0 0.0.0.0 192.168.12.253
The 253 is our Cisco ASA 5505.
Now I have setup a Sonicwall to replace the ASA, and am just doing some testing. I assigned an internal IP to the Sonicwall of 192.168.12.252. If I set up PCs with a def gw of 12.252, everything is fine, they can surf and all that. If I reconfigure the Cisco 3560G to say
ip route 0.0.0.0 0.0.0.0 192.168.12.252
No one can go anywhere.
What excatly am I missing here??