We am upgrading from DSL to a T1. The vendor has supplied a managed Cisco 2811. When I plug a computer directly into the router and configure the IP addresses correctly I can get out to the internet. However when I plug a PIX 506e (same one we are using for the DSL) into the router after changing the ip address and gateway (static route), the link is listed as down in ASDM. Also, the link light for the port on the PIX does not light up when plugged into the router. I change the PIX configuration back and plug it back into the DSL modem and the link comes up.
I've not seen anything like this before. Is there something I'm missing? I've tried both a straight and cross-over cable with the same results.