[9fans] Access through NAT

[Lyndon Nerenberg]

If you port forward the ticket port to your auth server and the  
exportfs port to your CPU server, you should be able to 'import  
nathost ...' from the wilds of the Internet.

As mentioned elsewhere, beware assinine five minute state timeouts in  
the NAT implementation. Push aan onto the connection, or run a  
background job that stats something across the mount every couple of  
minutes.