ZyXEL Communications P-202 - Manual (Page 43)

P-202H Plus v2 Support Notes
If you wish, you can make internal servers (e.g., Web, ftp or mail server)
accessible for outside users, even though SUA makes your LAN appear as a
single machine to the outside world. A service is identified by the port number.
Also, since you need to specify the IP address of a server in the P-202H Plus v2,
a server must have a fixed IP address and not be a DHCP client whose IP
address potentially changes each time it is powered on.
In addition to the servers for specific services, SUA supports a default server. A
service request that does not have a server explicitly designated for it is
forwarded to the default server. If the default server is not defined, the service
request is simply discarded.
• Configuration
To make a server visible to the outside world, specify the port number of the
service and the inside address of the server in 'Menu 15', Multiple Server
Configuration. The outside users can access the local server using the P-202H
Plus v2's WAN IP address which can be obtained from menu 24.1.
• For example (Configuring an internal Web server for outside access) :
• Port numbers for some services
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Service Port Number
FTP 21