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Appendix E: Glossary
Port Forwarding
E-22
Psion Teklogix 9160 G2 Wireless Gateway User Manual
Port Forwarding
Port Forwarding creates a ‘tunnel’ through a firewall, allowing users on the Internet
access to a service running on one of the computers on your LAN, for example, a
Web server, an FTP or SSH server, or other services. From the outside user’s point
of view, it looks like the service is running on the firewall.
PPP
The Point-to-Point Protocol is a standard for transmitting network layer datagrams
(IP packets) over serial point-to-point links. PPP is designed to operate both over
asynchronous connections and bit-oriented synchronous systems.
PPPoE
Point-to-Point Protocol over Ethernet (PPPoE) is a specification for connecting the
users on a LAN to the Internet through a common broadband medium, such as a
single DSL or cable modem line.
PPtP
Point-to-Point Tunnelling Protocol (PPtP) is a technology for creating a Virtual
Private Network (VPN) within the Point-to-Point Protocol (PPP). It is used to
ensure that data transmitted from one VPN node to another are secure.
Proxy
A proxy is server located between a client application and a real server. It intercepts
requests, attempting to fulfill them itself. If it cannot, it forwards them to the real
server. Proxy servers have two main purposes: improve performance by spreading
requests over several machines and filter requests to prevent access to specific
servers or services.
PSK
Pre-Shared Key (PSK), see Shared Key.