PPTP "fixup" for FreeBSD NAT Router

Rob Shepherd rob at techniumcast.com
Wed Oct 31 06:56:04 PDT 2007

Dear FreeBSD PF users,

We have Cisco FWSM software v2.3 which doesn't pass PPTP traffic due to it not 
being able to extract the GRE session information. Grrr.... Enterprise grade my 

Nevertheless, I am intrigued to see if I can provide an alternate route for a 
customers PPTP connection through a FreeBSD router.

I'll VLAN interface on to their LAN, NAT as usual to a public IP, but I would 
like to inquire (before I commence my setup) if...

1. FreeBSD NAT (PF) will pass PPTP
2. if (1), will it support multiple PPTP sessions (multiple clients to common 
remote VPN server)

Many thanks for any suggestions etc. much appreciated.

Rob Shepherd BEng PhD | Computer and Network Engineer | CAST Ltd
Technium CAST | LL57 4HJ | http://www.techniumcast.com

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