User's Manual Part 2

IPSEC
302 Check Point Safe@Office User Guide
be masquerading as a local
packet with the source IP address
of an internal host. The firewall
can protect against IP spoofing
attacks by limiting network
access based on the gateway
interface from which data is
being received.
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.
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