Configure an Internal Server Behind SUA

- Introduction

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-335 Plus, 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 internal address of the server. The outside users can access the local server using the P-335 Plus's WAN IP address. For example (Configuring an internal Web server for outside access):

- Port numbers for some services

Service | Port Number
FTP | 21
Telnet | 23
SMTP | 25
DNS (Domain Name Server) | 53
www-http (Web) | 80

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