bridge conflicting subnets together using NETMAP

[Michael Hale <michaelh@xxxxxxxxxxxxxxxx>]

I was wondering if it is possible to bridge two conflicting subnets 
with the NETMAP rule in such a way that they don't conflict?  The 
problem I am trying to solve is our lan uses 192.168.0.0/255.255.192.0 
and sometimes users establish a bridged vpn connection from their own 
lan which is very often 192.168.1.0/255.255.255.0.  My thought was that 
if there is someway to use the NETMAP rule to make both lans think they 
are talking to a virtual address space that does not conflict with 
anything, then everybody would be happy.  Has anyone already done 
something like this?  Any examples would be greatly appreciated.

Thanks, Michael