Technical Reference; Nat Port Forwarding: Services And Port Numbers - ZyXEL Communications BG-418N v1 User Manual

Chapter 10 Network Address Translation
Table 47 Network > NAT > Application (continued)
LABEL
Server IP Address
Apply
Reset
Application Rules Summary
#
Active
Name
Local Start/End
Port
Public Start/End
Port
Protocol
Server IP Address
Modify

10.5 Technical Reference

The following section contains additional technical information about the NBG-418N features
described in this chapter.

10.5.1 NAT Port Forwarding: Services and Port Numbers

A port forwarding set is a list of inside (behind NAT on the LAN) servers, for example, web or FTP,
that you can make accessible to the outside world even though NAT makes your whole inside
network appear as a single machine to the outside world.
Use the Application screen to forward incoming service requests to the server(s) on your local
network. You may enter a single port number or a range of port numbers to be forwarded, and the
local IP address of the desired server. The port number identifies a service; for example, web
service is on port 80 and FTP on port 21. In some cases, such as for unknown services or where one
server can support more than one service (for example both FTP and web service), it might be
better to specify a range of port numbers.
In addition to the servers for specified services, NAT 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 is not defined, the service request is simply discarded.
Note: Many residential broadband ISP accounts do not allow you to run any server
processes (such as a Web or FTP server) from your location. Your ISP may
periodically check for servers and may suspend your account if it discovers any
active services at your location. If you are unsure, refer to your ISP.
106
DESCRIPTION
Type the inside IP address of the server that receives packets from the port(s) specified in
the Port field.
Click Apply to save your changes to the Application Rules Summary table.
Click Reset to not save and return your new changes in the Service Name and Port
fields to the previous one.
This is the number of an individual port forwarding server entry.
This icon is turned on when the rule is enabled.
This field displays a name to identify this rule.
This field displays the port number(s).
This is the transport layer protocol used for the service.
This field displays the inside IP address of the server.
Click the Edit icon to display and modify an existing rule setting in the fields under Add
Application Rule.
Click the Remove icon to delete a rule.