My name's Pete and this is my first post. I have some exposure to Cisco products, mostly tweaking catalysts in a working network to do what the customer wants. I have a new conundrum and I would like to ask assistance. I have 2 Cisco 1800 routers, brand new from the factory routing multicast traffic over a dedicated T1 line. I have my FastEthernet interfaces set up as 192.168.1.10 one one router (I don't have an IP for the 2nd interfaces on either) and 192.168.1.20 on the other, full duplex speed 100, no shutdown. My serial interfaces are setup as T1, AMI, ESF, no shutdown, no IP address. I have one route in each router that looks like ip route 0.0.0.0 0.0.0.0 serial0/0/0 in one and ip route 0.0.0.0 0.0.0.0 serial0/1/0 in the other. I can ping the interface I connect my laptop to, and I can ping back from the 1800 to the laptop, I can't ping across the T1. By the way, I have the 2 routers connected locally on my bench using a T1 crossover cable, and my serial interfaces are green (as are ethernet when connected). Any help would be appreciated. Thanks!