Netgear DGB111G Operations Instructions download pdf (Page 177)

Reference Manual for the Model Wireless ADSL Firewall Router DG834G

Network and Routing Basics B-9

202-10006-05, June 2005

Related Documents

The station with the correct IP address responds with its own MAC address directly to the sending

device. The receiving station provides the transmitting station with the required destination MAC

address. The IP address data and MAC address data for each station are held in an ARP table. The

next time data is sent, the address can be obtained from the address information in the table.

For more information about address assignment, refer to the IETF documents RFC 1597, Address

Allocation for Private Internets, and RFC 1466, Guidelines for Management of IP Address Space.

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

Translator (NAT).

Domain Name Server

Many of the resources on the Internet can be addressed by simple descriptive names such as

www.NETGEAR.com. This addressing is very helpful at the application level, but the descriptive

name must be translated to an IP address in order for a user to actually contact the resource. Just as

a telephone directory maps names to phone numbers, or as an ARP table maps IP addresses to

MAC addresses, a domain name system (DNS) server maps descriptive names of network

resources to IP addresses.

When a PC accesses a resource by its descriptive name, it first contacts a DNS server to obtain the

IP address of the resource. The PC sends the desired message using the IP address. Many large

organizations, such as ISPs, maintain their own DNS servers and allow their customers to use the

servers to look up addresses.

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 DG834G wireless router has

the capacity to act as a DHCP server.

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Netgear DGB111G Operations Instructions Page 177