Cisco 1721 forwarding VPN to NT Server

[jasonpaton]

We have a client who uses a Cisco 1721 Router for their internet access and runs Microsoft SBS 4.5 for their server. They want to use VPN to access their office but I understand the 1721 does not support VPN. Is their a way of configuring the router to forward all inbound VPN traffic to the NT Server which will then authenticate the login and grant access to the network?

[vkapoor5]

1721 does have IPSec support. So you can use this image to build the VPN. Alternatively, you must be able to achieve authentication using a AAA server.

[jasonpaton]

TO have IPSec Support, do I need a certain version of the software or is it available on all versions?