Netopia R7200 manual Associating port numbers with nodes, Sdsl WAN1

10-6 User’s Reference Guide

When using numbered interfaces, the Netopia Router will use its local WAN IP address and subnet mask to send packets to the remote router. Both routers have WAN IP addresses and subnet masks associated with the connection.

6.If your ISP uses unnumbered (system-based) routing, select Remote IP Address and enter the IP address your ISP gave you. Then select Remote IP Mask and enter the IP subnet mask of the remote site you will connect to.

Note: When using unnumbered interfaces, the Netopia Router will use either its local Ethernet IP address or its NAT (Network Address Translation) address (if so configured) and subnet mask to send packets to the remote router. Neither router has a WAN IP address or subnet mask associated with this connection. These default addresses will request that the remote router dynamically assign an address at the time the connection is made.

7.When your Netopia R7200 connects to the ISP, the remote router assigns your Netopia R7200 an IP address that external users use to communicate with your network.

The following Quick View screen shows an example in which 192.168.100.6 is assigned to the Netopia R7200. “NAT” indicates that the address was assigned dynamically by Network Address Translation.

		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

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.

Associating port numbers with nodes

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.