In most cases forwarding the ports (many!) needed for services on machines
behind a firewall in the router configuration is not enough as the service will
run behind a NAT router and it needs to know this. For this reason there are
options in the service like 'obtain IP from server' or 'NAT mode' or 'use a
firewalled router'. Also some routers have preset forwarding options that cater
for certain services. Those then do 'the right thing' for the type of service
they support. The best instructions are always those from the software provider:

  http://www.azureuswiki.com/index.php/NAT_problem

In any case I would think twice about putting a Windows machine that has not
been secured proffesionally in a DMZ (I would also think twice about doing the
same with a Linux machine, by the way ...).

Peter P.


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