Microsoft's PPTP uses Port 1723/tcp as the control port and Protocol ID
47 / GRE
> From: snorthc @
> Sent: Tuesday, August 05, 1997 6:49 AM
> To: Firewalls @
> Subject: Re: PPTP & FW-1
> >I'm attempting to setup a FW-1 filter to support PPTP.
> >I'm using FW-1 3.0a on Solaris.
> >PPTP is not defined, how do I seutp a fitler just for PPTP not all
> >Thanks In Advance
> >Bert Carroll
> Hmmm, we did this in class last week, its not as GUI as one
> might think! Try:
> Define service pptp
> TCP 5678 "control"
> Define service, other, match IP_P = 47
> Define service, other
> match IP_P = 47, ([20:2, b]) & 0xEF7F = 0x2001, [22:2, b] = 0x800
> Maybe that will get you close :)