PPTP, GRE pass-through

hectorsandoval · ‎09-01-2008

I have recently implement a migration from router cisco 2801 to a new router 3845, and I am having problems with clients that needs to connect through our service to their VPN server, we don't have any firewalll nor access-list, but we do have NAT.

r1--->r2---->r3--->ISP

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NAT

Marwan ALshawi · ‎09-01-2008

u need to make static nat from the ISP (public) Ip to the inernal server IP

if u have one IP

u can make it work as static PAT also know as port forwarding only make nat/PAT on spesific port/ports u need to map it to internal server

like pptp,gre, udp 500 and esp and so on

if helpful Rate

hectorsandoval · ‎09-02-2008

Thanks for the answer, We don't have a VPN server in our Network. What is happening is that all traffic that is relate with VPN is been filtered for some reason in our router 3845.

We are a small company that provide internet service to clients in the area, and since the migration those clients are not able to do VPN connections to their servers, all other services are OK, just VPN service is been block when traffic goes trough our network.

singhsaju · ‎09-02-2008

Hello,

For PPTP the signalling happens at TCP 1723 but the data transfer is GRE protocol.

You would need a dedicated public ip as NAT'ed ip for PPTP to work.

HTH

Saju

hectorsandoval · ‎09-02-2008

We are a small company that provide internet service to clients in the area, and since the migration those clients are not able to do VPN connections to their servers, all other services are OK, just VPN service is been block when traffic goes trough our network. We do not have a VPN server.

Thanks