SnapGear LITE, User Manual, Page: 7 / 95

Introduction
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IDB Intruder Detection and Blocking. A feature of your SnapGear VPN Router that
detects connection attempts from intruders and optionally blocks all further
connection attempts from the intruders’ machine.
Internet A worldwide system of computer networks - a public, cooperative, and self-
sustaining network of networks accessible to hundreds of millions of people
worldwide. Technically, what distinguishes the Internet is its use of a set of
protocols called TCP/IP.
Intranet A private TCP/IP network contained within an enterprise.
IPSec Internet Protocol Security. IPSec provides interoperable, high quality,
cryptographically based security at the IP layer, thus offering protection for all
network communications.
LAN Local Area Network.
LED Light-Emitting Diode.
MAC Address An Ethernet address set by the manufacturer.
Masquerade The process by which a gateway on the local network modifies outgoing packets
to replace the source address of these packets with its own IP address. In this
way, all IP traffic originating from the local network appears to come from the
gateway itself and not the machines on the local network.
NAT Network Address Translation. The translation of an IP address used on one
network to another IP address known on another network.
Net Mask The way that computers know which part of a TCP/IP address refers to the
network, and which part refers to the host range.
NTP Network Time Protocol (NTP) is used to synchronize clock times in a network
of computers.
PAT Port Address Translation. The translation of a port number used on one network
to another port number known on another network.