NAT Passthrough -- Cisco1720

[jclark888]

I have been having a VPN issue recently and after speaking with my service prodvider they informed me that since I'm using NAT on my router and pptp I need to use NAT Passthrough.

I'm not sure how to configure this on a Cisco 1720 router running IOS 12.1.

Please Assist.

[umedryk]

Microsoft PPTP tunneling is widely deployed and used to enable remote users to connect back to their corporate network in a secured fashion across the public internet. Currently Cisco IOS Network Address Translation (NAT) only supports PPTP tunneling when configuring "Static or Dynamic" 1 to 1 address translation. The Overload, or Port Address Translation (PAT) configuration is not supported. So each individual PPTP tunnel requires its own IP address.

[Tsasbrink]

if you use any access lists permitting gre in will do.