Справочник Пользователя для Dynalink RTA1320

Chapter 6: Glossary 

ARP is a TCP/IP p
recognized in the 

A host wishing to obtain a physical address broadcasts an ARP request onto the TCP/IP network. 
The host on the network that has the IP address in the request then replies with its physical 
hardware address.   

Inverse ARP (In-ARP), on the other hand, is used by a host to discover its IP address. In this case, 
the host broadcasts its physical address and a RARP server replies with the host's IP address.   

When operates as a DHCP server, the ADSL Router assign IP addresses to the client PCs on the 
LAN. The client PCs “leases” these Private IP addresses for a user-defined amount of time. After 
the lease time expires, the private IP address is made available for assigning to other network 
devices. 

The DHCP IP address can be a single, fixed public IP address, an ISP assigned public IP address, 
or a private IP address. 

If you enable DHC
to the NAT IP add
translated into a p

y this, the client PCs are able to access the Internet. 

A LAN is a comput

uilding or floor of a 

building. A WAN, o

r network or the Internet.   

The Ethernet side
10Base-T interfac

LAN port. More than one computers, such as 

server or prin

AN. 

The DSL port of th

ts PPP or RFC 

1483 connecting t

NAT is an Internet

ork to a public IP address, 

either a static or dynami

s. It 

also enables a com

If the IP addresses given by your ISP are not enough for each PC on the LAN and the ADSL 
Router, you need to use NAT. With NAT, you make up a private IP network for the LAN and 
assign an IP address from that network to each PC. One of some public addresses is configured 
and mapped to a private workstation address when accesses are made through the gateway to a 
publi  network.   

For example, the ADSL Router is assigned with the public IP address of 168.111.2.1. With NAT 
enabled, it creates a Virtual LAN. Each PC on the Virtual LAN is assigned with a private IP 
address with default value of 192.168.2.2 to 192.168.2.254. These PCs are not accessible by the 
outside world but they can communicate with the outside world through the public IP 168.111.2.1. 

Private IP addresses are also LAN IP addresses, but are considered “illegal” IP addresses to the 
Internet. They are private to an enterprise while still permitting full network layer connectivity 
between all hosts inside an enterprise as well as all public hosts of different enterprises. 

rotocol for mapping an IP address to a physical machine address that is 

local network, such as an Ethernet address. 

P server on a private IP address, a public IP address will have to be assigned 

ress, and NAT has to be enabled so that the DHCP IP address can be 
ublic IP address. B

er network limited to the immediate area, usually the same b

n the other hand, is an outside connection to anothe

 of the ADSL Router is called the LAN port. It is a twisted-pair Ethernet 
e. A hub can be connected to the 

ter, can be connected through this hub to the ADSL Router and composes a L

e ADSL Router composes the WAN interface, which suppor

o another remote DSL device.   

 standard that translates a private IP within one netw

c one. NAT provides a type of firewall by hiding internal IP addresse

pany to use more internal IP addresses.   

c