I need to setup a WAN for a company that is geographically separated. Here is a simple diagram of the layout:
LAN3 and LAN2 has a T1 connection to the Internet. All traffic originating from LAN3(intranet and Internet) is routed through LAN2. Each site is connected to the Internet with a Cisco 2611 router. LAN2 needs interdomain traffic to LAN3 plus LAN2 has services published on the Internet as well as users who access the Internet.
I want to set up a VPN site-to-site tunnel between LAN3 and LAN2 with the Cisco routers. Also the traffic destined to and from LAN2 and the Internet must function as well.
LAN3 will have all traffic going through the tunnel to LAN2. My question is, is it possible to use the one T1 frame connection on LAN2 to tunnel traffic to LAN3 and also allow Internet traffic to flow from LAN2 to the Internet and back? Is there a better solution? I have very short time to come up with a solution.
Im very comfortable with Cisco routers, but have never set up a site-to-site VPN with Cisco equipment. (Microsoft yes, and VPN for remote access on a PIX, but not a Cisco router)
Thank very much in advance.