PPP Gateway

[Evan Sayer]

Hello-
I want to setup PPP to accept dial in connections on my LAN's gateway, 
but I want the gateway machine to pass on all packets to a specific 
machine inside the network, in a secure way.  The best way I can think 
of doing it (hypothetically), would be to forward all PPP connections 
from the gateway to the machine in the inside of the network via ssh.  
I, however, have no idea how to do this, so any help is appreciated.  I 
use user-ppp, by the way.
-Thanks in advance.