Associating port numbers with nodes, Associating por t numbers with nodes -7 – Netopia R5300 User Manual
Page 107
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 ser ver such as a Web ser ver, the client machine must know the IP address to use and the TCP ser vice
por t where the traffic is to be directed.
For example, a Web browser locates a Web ser ver by using a combination of the IP address and TCP por t that
the client machine has set up.
Just as an IP address specifies a par ticular computer on a network, por ts are addresses that specify a
par ticular ser vice in a computer. There are many universally agreed-upon por ts assigned to various ser vices.
For example:
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Web ser vers typically use por t number 80
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All FTP ser vers use por t number 21
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Telnet uses por t number 23
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SNMP uses por t number 161
To help direct incoming IP traffic to the appropriate ser ver, the Netopia R5000 Series Router lets you associate
these and other por t numbers with distinct IP addresses on your internal LAN using the feature called expor ted
ser vices. See
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