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IP Setup and Network Address Translation 9-7
Internal users can access the Internet as they always do; the external Internet, however, views all traffic from
the internal network as originating from 192.168.100.6 and all traffic your network receives is addressed to
192.168.100.6.
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When an IP client such as a Netscape Navigator or Microsoft Internet Explorer wants to establish a session with
an IP server such as a Web server, the client machine must know the IP address to use and the TCP service
port where the traffic is to be directed.
For example, a Web browser locates a Web server by using a combination of the IP address and TCP port that
the client machine has set up.
Just as an IP address specifies a particular computer on a network, ports are addresses that specify a
particular service in a computer. There are many universally agreed-upon ports assigned to various services.
For example:
■ Web servers typically use port number 80
■ All FTP servers use port number 21
■ Telnet uses port number 23
■ SNMP uses port number 161
To help direct incoming IP traffic to the appropriate server, the Netopia R5000 Series Router lets you associate
these and other port numbers with distinct IP addresses on your internal LAN using the feature called exported
services. See “IP setup” on page 9-12 for details.
Quick View 12/11/1998 12:45:44 PM
Default IP Gateway: 0.0.0.0 CPU Load: 2% Unused Memory: 952 KB
Domain Name Server: 0.0.0.0
Domain Name: None Provided LocalTalk Address: 34448:149
----------------MAC Address--------IP Address-------IPX Address---EtherTalk---
Ethernet Hub: 00-00-c5-70-03-48 192.168.1.1 34449:150
SDSL WAN1: 00-00-c5-70-03-4a 0.0.0.0
Current DSL Status
Profile Name----------Rate--%Use-Remote Address-----Est.-More Info------------
ISP P1 10% IP 92.163.4.1 Lcl NAT 192.168.100.6
LED Status
PWR-+-----WAN1------+--CON--AUX--+-----WAN2------+--EN--+--------LEDS---------
LNK RDY CH1 CH2 LNK LNK LNK RDY CH1 CH2 DATA | '-'= Off 'G'= Green