Depends.  If you have more than one IP I would just NAT PAT the extra IP 
to the m0n0wall and then set it up as if it is the firewall / PPTP 
server.  Probably most "normal" way wich won't require any twisting of 
your brain.

you could always just port forward PPTP traffic from your main firewall 
to the 192.168.x.0/28 network address used for the WAN interface on the 
m0n0wall.  Do remember you will need to tell the m0n0wall to permit RFC 
1918 addresses on the WAN interface. (technically the routing of 1918 
addresses.) 

The rest of the setup is de facto.  Just pull the PPTP guide from the 
m0n0wall document server or check the updated PPTP setup docs at 
http://rdr.to/gl there is a link to a how to video there too. 


Trevor Merrill wrote:

> I want to setup monowall behind an existing firewall to provide VPN  
> access for users to all LAN resources. I just want monowall to act as  
> a vpn server and let the firewall currently in place do the 
> filtering.  Is this possible with monowall? My current setup is a very 
> basic one:
>
> DSL modem with static IP block -> Linksys running DD-WRT -> switch ->  
> servers
> WAN IP block                    192.168.1.x range
>
> Where would I place the monowall? What would the WAN and LAN  
> interfaces be? What would the monowall PPTP config look like? Does  
> anyone know of a good VPN resource for more of a vendor neutral  
> explanation of VPNs, their placement and configuration?
>
> Many thanks,
> Trevor
>
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