D-Link NetDefend DFL-CP310 User Manual page 472

Glossary of Terms
IPSEC
IPSEC is the leading Virtual Private
Networking (VPN) standard. IPSEC
enables individuals or offices to
establish secure communication
channels ('tunnels') over the Internet.
ISP
An ISP (Internet service provider) is
a company that provides access to
the Internet and other related
services.
L
LAN
A local area network (LAN) is a
group of computers and associated
devices that share a common
communications line and typically
share the resources of a single server
within a small geographic area.
M
MAC Address
The MAC (Media Access Control)
address is a computer's unique
hardware number. When connected
to the Internet from your computer, a
mapping relates your IP address to
your computer's physical (MAC)
address on the LAN.
Mbps
Megabits per second. Measurement
unit for the rate of data transmission.
456
MTU
The Maximum Transmission Unit
(MTU) is a parameter that
determines the largest datagram than
can be transmitted by an IP interface
(without it needing to be broken
down into smaller units). The MTU
should be larger than the largest
datagram you wish to transmit un-
fragmented. Note: This only
prevents fragmentation locally.
Some other link in the path may
have a smaller MTU - the datagram
will be fragmented at that point.
Typical values are 1500 bytes for an
Ethernet interface or 1452 for a PPP
interface.
N
NAT
Network Address Translation (NAT)
is the translation or mapping of an IP
address to a different IP address.
NAT can be used to map several
internal IP addresses to a single IP
address, thereby sharing a single IP
address assigned by the ISP among
several PCs.
Check Point FireWall-1's Stateful
Inspection Network Address
Translation (NAT) implementation
supports hundreds of pre-defined
applications, services, and protocols,
more than any other firewall vendor.
D-Link NetDefend firewall User Guide