ZyXEL Communications P-661HW-D Series Support Note page 73

P-661HW-D Series Support Notes
Step 3: Now we configure all other incoming traffic to go to our web server and
mail server from Web Configurator, Advanced Setup, Network -> NAT -> Port
Forwarding:
(4) Support Non NAT Friendly Applications
Some servers providing Internet applications such as some mIRC servers do
not allow users to login using the same IP address. In this case it is better to
use Many-to-Many No Overload or One-to-One NAT mapping types, thus each
user login to the server using a unique global IP address. The following figure
illustrates this.
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