User's Manual

MAC Address
240 Check Point Safe@Office User Guide
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.
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.
NetBIOS
NetBIOS is the networking
protocol used by DOS and
Windows machines.
P
Packet
A packet is the basic unit of data
that flows from one source on
the Internet to another
destination on the Internet. When
any file (e-mail message, HTML
file, GIF file etc.) is sent from
one place to another on the
Internet, the file is divided into
"chunks" of an efficient size for