I am reconfiguring my network to use a T1 instead of a dsl connection. We are also changing ISP's so our Ip bank will change. Right now I have an ISP managed DSL router This is connected to a hub that has the external interface of my Cisco 2611, and the external interface of my ISA server. The 2611 is serving all my remote sites without frame VPN access, they use Cisco 1720s. It is also providing NAT for my exchange server. The 2611 has two ethernet ports. The ISA Server is providing Internet Access for all of my VPN sites as well as the frame sites and local site. It also handles all mobile user VPN connections. The frame sites all use 1720's as well and are connected to a separate router on the internal network. I just want to know if anyone has any tips for my reconfig. What I had in mind is: Take the Cisco 2611 and add 1 T1 WIC. This will give it 1 T1 interface and two ethernet. Set up one ethernet interface up for the private network, same as it is now. Exchange server will go on the private network and use Static NAT through 2611. Connect External interface of ISA to a hub with other ethernet port on the router. This is where I run into problems. Can I have the 2611 act just like that DSL router and If I give any device an Ip address out of my Pool from my ISP and set default gateway to the 2611 will they be reachable on the internet through those addresses? Thanks for any help.