[pptp-server] pptp vpn and masquerading

[Larry Rivera]

Hello:

I have a dedicated connection to the internet using a linux server
running kernel version 2.2.13. This server also is a member of a privat
lan in the normal firewall setup that is prevalent these days.

I have successfully configured the joining  of two remote locations via
pptp tunnels and these have their own subnet assigned.  My problem is
that since I had to turn off masquerading in the kernel config, (because
my incoming connections were being masqueraded as the server's ethernet
ip address creating problems for printing, etc.) now my outgoing clients
cannot access the internet as before from behind this server (these
clients have private ip numbers). I HAVE read all of the documentation
out there but am still unsure of several issues.
Is it possible to have the following setup?:

1. Masquerade outgoing connections for internet browsing from a private
network behind firewall.
2. DO NOT Masquerade incoming pptp connections so that remote machines
can access the applications server with their ip address intact.

Has anyone seen a setup like this?
Thanks
LR