Linkskey LKR-604 - Manual (Page 42)

LKR-604
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NAT
Network Address Translation (NAT) allows multiple users at the local
site to access the Internet through a single public IP address. NAT can
also prevent hacker attacks by mapping local addresses to public
addresses for key services such as the Web or FTP.
Special Application
Some applications require multiple connections, such as Internet
gaming, video conferencing, and Internet telephony. These applications
cannot work when Network Address Translation (NAT) is enabled.
When users send this type of request to your network via the Internet,
the LKR-604 Broadband Router will forward those requests to the
appropriate PC. If you need to run applications that require multiple
connections, specify the port normally associated with an application in
the "Trigger Port" field, select the protocol type as TCP or UDP, then
enter the public ports associated with the trigger port to open them for
inbound traffic.
z
TCP (Transmission Control Protocol) - A method (protocol) used
along with the Internet Protocol (Internet Protocol) to send data in
the form of message units between computers over the Internet.
While IP takes care of handling the actual delivery of the data,
TCP takes care of keeping track of the individual units of data
(called packets) that a message is divided into for efficient routing
through the Internet.
z
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 use 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