I am having some issues with the configuration of the WAN connection of a Network with a WAN - RAD-Ethernet of 1024K local ISP access & LAN - Cisco Firewall ASA 5510. Previously, it was using Router 871+ series. Recently my client wants to swap to a higher-end router - 1841. However, when i configure the router, I set Ethernet0/0 to be the LAN connection & it works fine. As for the Ethernet0/1 (WAN connection) IP address to be the same subnet as the RAD ethernet, there is NO connection at all. Unable to figure out what is the real cuase behind it. Can anyone assist please. Appreciate.