I am using a 3925 router running 15.1(1)T software.  The router has four interfaces: GBE0/0     WAN/InternetGBE0/1     LAN1GBE0/2     LAN2GBE0/3     LAN3LAN1, LAN2 and LAN3 are seperate networks addressed with public addresses in a single /22 block. ...

I have a customer with an existing Cisco 1721 equipped with a WIC-1DSU-T1 for internet access. The customer wants add bandwidth with an additional T1.The ISP they have been talking to says it's as simple as adding the new T1, adding another WIC-1DSU...