Glossary - Mercury KOB WL530 User Manual

Glossary

This chapter presents a more detailed description of the Broadband Wireless Router (AP)'s
configuration parameters.
DHCP (Dynamic Host
Configuration Protocol)
When operates as a DHCP server, the
Broadband Wireless Router (AP)
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 DHCP server on a
private IP address, a public IP
address will have to be assigned to
the NAT IP address, and NAT has to
be enabled so that the DHCP IP
address can be translated into a public
IP address. By this, the client PCs are
able to access the Internet.
Authentication and WEP
Encryption
The absence of a physical connection
between nodes makes the wireless
links vulnerable to eavesdropping and
information theft. To provide a
certain level of security , the IEEE
8002.11 standard has defined two
types of authentication methods, open
key and shared key. With open key
authentication a wireless PC can join
any network and receive any
messages that are not encrypted. With
shared key authentication, only those
PCs that possess the correct
authentication key can join the
network. By default IEEE 802.11
wireless devices operate in an Open
Key network.
LAN (Local Area Network) &
WAN (Wide Area Network)
A LAN is a computer network
limited to the immediate area, usually
the same building or floor of a
building. A WAN, on the other hand,
is an outside connection to another
network or the Internet.
The Ethernet side of the Broadband
Wireless Router (AP) is called the
LAN port. It is a twiced-pair Ethernet
10Base-T interface. A hub can be
connected to the LAN port. More
than one computers, such as server or
printer, can be connected through this
hub to the Broadband Wireless
Router (AP) and composes a LAN.
The WAN port of the Broadband
Wireless Router (AP) composes the
WAN interface, which supports PPP
or RFC 1483 connecting to another
remote DSL device of ATU-R.
Private IP Address
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.
The Broadband Wireless Router (AP)
uses private IP addresses by
assigning them to the LAN that
cannot be directly accessed by the
Internet or remote server. To access
the Internet, private network should
have an agent to translate the private
IP address to public IP address.
39