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 ser vice s. 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. I t int ercepts
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.