McAfee FIREWALL 2.1-GETTING STARTED Getting Started page 34

Glossary
Hypertext Transfer Protocol, a powerful tool used primarily for browsing the
World Wide Web.
HTTPS
Secure HTTP. This is a variation of HTTP that uses encryption to add privacy.
ICMP
Internet Control Message Protocol, a maintenance protocol that handles error
messages and helps network debugging. ICMP is carried in IP packets.
ICMP is easily abused and has become a serious annoyance to IRC chatgroup
users. Because other users can find out information about you, such as your
IP address, they can easily send false ICMP messages to your system, causing
it to promptly drop your IRC connection.
ICQ
An Internet service that helps people find each other and share information.
ICQ has been found to have security weaknesses.
Identification
A service that provides user information to be used on another system, so they
can try to verify your identity. If you block it, other systems (such as email
servers) may refuse you their services.
This service is also known as "ident" or "auth".
inbound packet
A packet arriving from a remote computer or network.
IP
The essential network protocol of the Internet. It supports TCP, UDP, ICMP
and many others. McAfee Firewall filters TCP, UDP and ICMP, and System
Settings allow you to allow or block the remaining protocols.
IPX
Network protocol, most commonly used by Novell. It supports SPX. Also, it
can be tunneled over IP. McAfee Firewall can block IPX and other non-IP
protocols.
IRC
34 McAfee Firewall