Netgear ME103 User Manual download pdf (Page 90)

Reference Manual for the ME103 802.11b ProSafe Wireless Access Point

C-8 Network, Routing, Firewall, and Cabling Basics

August 2003

The following figure illustrates a single IP address operation.

Figure 6-5: Single IP Address Operation Using NAT

This scheme offers the additional benefit of firewall-like protection because the internal LAN

addresses are not available to the Internet through the translated connection. All incoming

inquiries are filtered out by the router. This filtering can prevent intruders from probing your

system. However, using port forwarding, you can allow one PC (for example, a Web server) on

your local network to be accessible to outside users.

For more information about IP address translation, refer to RFC 1631, The IP Network Address

Translator (NAT).

IP Configuration by DHCP

When an IP-based local area network is installed, each PC must be configured with an IP address.

If the PCs need to access the Internet, they should also be configured with a gateway address and

one or more DNS server addresses. As an alternative to manual configuration, there is a method by

which each PC on the network can automatically obtain this configuration information. A device

on the network may act as a Dynamic Host Configuration Protocol (DHCP) server. The DHCP

server stores a list or pool of IP addresses, along with other information (such as gateway and DNS

addresses) that it may assign to the other devices on the network. The ME103 Access Point has the

capacity to act as a DHCP server.

7786EA

92.168.0.2

92.168.0.3

92.168.0.4

92.168.0.5

192.168.0.1 172.21.15.105

Private IP addresses

assigned by user

Internet

IP addresses

assigned by ISP

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Netgear ME103 User Manual Page 90