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PPTP redirection through a pat interface on a PIX

Is it possible to redirect PPTP traffic comming to the outside interface of a PIX that has a single IP or do you actually have to have an entire IP address translated for the PPTP termination Device.

Example I have a PIX with a single public ip address that I currently redirect ports 23 25 53 110 to a 2k server internally. Would I be able to redirect pptp traffic to that server also or will I have problems with gre and need an additional ip address?

Patrick Laidlaw

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Cisco Employee

Re: PPTP redirection through a pat interface on a PIX

The GRE will cause you problems. PPTP uses both GRE (IP protocol 47) and TCP port 1723. You'll be able to redirect the TCP/1723 traffic, but not the GRE.

To do this, you'll need another separate IP address.

2 REPLIES
Cisco Employee

Re: PPTP redirection through a pat interface on a PIX

The GRE will cause you problems. PPTP uses both GRE (IP protocol 47) and TCP port 1723. You'll be able to redirect the TCP/1723 traffic, but not the GRE.

To do this, you'll need another separate IP address.

Re: PPTP redirection through a pat interface on a PIX

Thanks I came to the same conclusion but wanted someone to reconfirm.

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