User’s Manual of WGR-500-4P and WGR-500-4PV
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the device uniquely among all other devices connected to the extended network.
The current version of the Internet protocol is IPv4, which has 32-bits Internet Protocol addresses
allowing for in excess of four billion unique addresses. This number is reduced drastically by the practice
of webmasters taking addresses in large blocks, the bulk of which remain unused. There is a rather
substantial movement to adopt a new version of the Internet Protocol, IPv6, which would have 128-bits
Internet Protocol addresses. This number can be represented roughly by a three with thirty-nine zeroes
after it. However, IPv4 is still the protocol of choice for most of the Internet.
IP Source Guard
IP Source Guard is a secure feature used to restrict IP traffic on DHCP snooping untrusted ports by
filtering traffic based on the DHCP Snooping Table or manually configured IP Source Bindings. It helps
prevent IP spoofing attacks when a host tries to spoof and use the IP address of another host.
L
LAN
Local Area Network. A LAN is a group of computers and devices connected together in a relatively small
area (such as a house or an office). Your network is considered a LAN.
N
NAT
Network Address Translation. NAT technology translates IP addresses of a local area network to a
different IP address for the Internet Using the NAT capability of WGR-500 Series , you can access the
Internet from any computer on your network without having to purchase more IP addresses from your
ISP.
NetBIOS
NetBIOS is an acronym for
Net
work
B
asic
I
nput/
O
utput
S
ystem. It is a program that allows applications
on separate computers to communicate within a Local Area Network (LAN), and it is not supported on a
Wide Area Network (WAN).
The NetBIOS giving each computer in the network both a NetBIOS name and an IP address
corresponding to a different host name, provides the session and transport services described in the
Open Systems Interconnection (OSI) model.
NTP
NTP is an acronym for
N
etwork
T
ime
P
rotocol, a network protocol for synchronizing the clocks of
computer systems. NTP uses UDP (datagrams) as transport layer.
PD
