ZyXEL Communications 480 manual Multiple Servers behind SUA, Callback and Clid Connection Test

Prestige 480 Dual BRI ISDN Router

Copyright (c) 1994 - 1999 ZyXEL Communications Corp.

LAN_2>sys trcl call

Tracelog type 9080 level 1

### Hit any key to terminate

***INTL CLID check: ch=7743bc reason=-3026

***INTL chanErr: chp=7743bc state=6 evt=0300

CLID Authentication

Prestige on LAN 2 calls back.

Connection

Established

Figure 8-15 Callback and CLID Connection Test

8.5Multiple Servers behind SUA

If you wish, you can make inside servers for different services, e.g., web or FTP, visible to the outside users, even though SUA 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, if you have a web server at 192.168.1.2 and an FTP server 192.168.1.3, then you need to specify for port 80 (web) the server at IP address 192.168.1.2 and for port 21 (FTP) another at IP address 192.168.1.3.

Please note that 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. Also, since you need to specify the IP address of a server in the Prestige, 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.

To make a server visible to the outside world, specify the port number of the service and the inside IP address of the server in Menu 15, Multiple Server Configuration. For more information on configuring supporting applications behind SUA refer to the ZyNOS Support Note documentation in your PNC disc.

Dial-In Server Configuration 8-17