[pptp-server] Relay for PPTP server?

[Dave DeChellis]

Hello,

I would like to have external clients connect through our firewall to an
internal PPTP server.  I would also like to have a relay
of some sort on the external network and just have one trusting rule through
the firewall to the PPTP server.  

However, this is tricker since there are multiple protocols to deal with as
opposed to a true TCP/IP establishment.

Is there such an animal which runs under various flavors of UNIX?  I could
deal with a Linux guy.

Thanks for any info,
Dave DeChellis
daved at crl.dec.com