Table of Contents
Advertisement
Appendix D: Glossary
PID
Ethernet
and the
802.11
family are protocols with physical layer components.
PID
The Process Identifier (PID) is an integer used by Linux to uniquely identify a process. A
PID is returned by the
system call. It can be used by
or
to perform actions on
fork()
wait()
kill()
the given process.
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.
Psion Teklogix 9160 G2 Wireless Gateway User Manual
D-65
Advertisement
Table of Contents
