Allow VPN Traffic on Cisco 1841 Router


I am trying to set up a VPN on my corporate network. In a 2003 environment we have used the Routing and Remote Access feature of 2003 server to set up a VPN. We have a Cisco 1841 Router and a Cisco ASA 5500 series firewall. I have configured the firewall to allow PPTP and GRE traffic, however, i am unsure what configuration i have to make to my router in order for this to work. Currently when we try to VPN into the network we are getting the infamous "721 error, remore comouter did not respond". Any advice?
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So your ASA has a Public IP and sits behind your 1841 router?
If so, there should be no configuration required on the 1841.
ISRAdminAuthor Commented:
Not exactly. We have an AT&T managed router, than the cisco firewall, (the outside interface acts as the public IP) then an internal 1841 that serves as a point to point router for other sites, as well as the default gateway for the internal network. A little confusing..
Can you not use the ASA for the point to Point?
However, is NAT configured on the 1841 for the PPTP Passthrough also? The rules below show the NAT rule and also the access list requirement if you have them in place on the External Interface.

ip nat inside source static tcp 1723 interface EXTERNAL_INTERFACE 1723
access-list 100 permit gre any any

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ISRAdminAuthor Commented:
I needed to add: policy-map global_policy
                           class inspection_default
                           inspect pptp

thanks for all the help though

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