User's Manual

35
l UDP (User Datagram Protocol) - A communications method
(protocol) that offers a limited amount of service when messages
are exchanged between computers in a network that uses the
Internet Protocol (IP). UDP is an alternative to the TCP and,
together with IP, is sometimes referred to as UDP/IP. Like the
Transmission Control Protocol, UDP uses the Internet Protocol to
actually get a data unit (called a datagram) from one computer to
another. Unlike TCP, however, UDP does not provide the service of
dividing a message into packets (datagrams) and reassembling it at
the other end. Specifically, UDP doesn't provide sequencing of the
packets that the data arrives in. This means that the application
program that uses UDP must be able to make sure that the entire
message has arrived and is in the right order. Network applications
that want to save processing time because they have very small data
units to exchange (and therefore very little message reassembling to
do) may prefer UDP to TCP.
Example:
ID Trigger Port
Trigger
Type
Public Port
Public
Type
Comment
1 28800 UDP 2300-2400, 47624 UDP
MSN Game
Zone
2 28800 UDP 2300-2400, 47624 TCP
MSN Game
Zone
3 6112 UDP 6112 UDP Battle.net