Ip configuration by dhcp – NETGEAR ME103 User Manual

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Reference Manual for the ME103 802.11b ProSafe Wireless Access Point


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.


Private IP addresses
assigned by user


IP addresses
assigned by ISP