Nat Server Sets - ZyXEL Communications Prestige 202 User Manual

Prestige 202 ISDN Router
FIELD
the Global IP Start. Note that Global IP
Start can be set to 0.0.0.0 only if the types
are Many-to-One or Server.
End This is the ending global IP address (IGA).
This field is N/A for One-to-One, Many-to-
One and Server types.
Server Mapping This field is only available when the Type
Set field is set at Server. Enter a single-digit
number from 0 to 9 to refer to a particular
server mapping set.
NOTE: For all Local and Global IPs, the End IP address must begin after the IP Start
address, i.e., you cannot have an End IP address beginning before the Start IP address.

7.5.2 NAT Server Sets

A NAT Server Set is a list of LAN side servers mapped to external ports (similar to the old SUA
Menu 15.1 before). If you are using Ethernet Encapsulation with either RR-Manager or RR-
Toshiba Service Type port 12 set to 1025 (non-editable) as displayed in Figure 7-14.
Multiple Servers Behind NAT
If you wish, you can make inside servers for different services, e.g., web or FTP, visible to the
outside users, even though NAT makes your whole inside network appear as a single machine to
the outside world. A service is identified by the port number, e.g., web service is on port 80 and
FTP on port 21.
As an example (see the following figure), if you have a web server at 192.168.1.36 and an FTP
server at 192.168.1.33, then you need to specify for port 80 (web) the server at IP address
192.168.1.36 and for port 21 (FTP) another at IP address 192.168.1.33.
NOTE: A server can support more than one service, e.g., a server can provide both
FTP and DNS service, while another provides only web service.
7-14
DESCRIPTION OPTION/EXAMPLE
0.0.0.0
172.16.23.55
0 to 9
NAT