Point-to-Point Protocolcomputing dictionary

<communications, protocol> (PPP) The protocol defined in RFC 1661, the Internet standard for transmitting network layer datagrams (e.g. IP packets) over serial point-to-point links.

PPP has a number of advantages over SLIP; it is designed to operate both over asynchronous connections and bit-oriented synchronous systems, it can configure connections to a remote network dynamically, and test that the link is usable. PPP can be configured to encapsulate different network layer protocols (such as IP, IPX, or AppleTalk) by using the appropriate Network Control Protocol (NCP).

RFC 1220 describes how PPP can be used with remote bridging.

Usenet newsgroup: comp.protocols.ppp.

A paper on PPP.

Acronym: PPP

(01 Mar 1994)

Point-to-Point Protocol over ATMcomputing dictionary

<networking> (PPPoA) A network protocol for encapsulating PPP frames in ATM AAL5. It is used mainly with cable modem, DSL and ADSL services.

PPPoA offers standard PPP features such as authentication, encryption, and compression. It is very slightly more efficient than PPPoE and, like PPPoE, supports VC-MUX and LLC encapsulation.

PPPoA is specified in RFC 2364.

Acronym: PPPoA

(01 Jan 2007)

Point-to-Point Protocol over Ethernetcomputing dictionary

<communications, protocol> (PPPoE) The protocol defined in RFC 2516 that allows one or more computers to connect to the Internet via a shared modem. The computers connect to the modem via a local area network such as Ethernet and the modem connects to an Internet Service Provider (ISP) via a serial connection such as PPP over ADSL.

PPPoE provides each user with a connection that looks and behaves like a point-to-point dial-up connection even though they are actually sharing an Ethernet or wireless network. At the same time, the ISP only needs to provide a single Internet connection, with the same kind of accounting as for PPP. Also, the IP address is only assigned when the PPPoE connection is open, allowing the dynamic reuse of IP addresses via DHCP.

PPPoE works by encapsulating PPP frames in Ethernet frames.

Acronym: PPPoE

(01 Nov 2006)

Point-to-Point Tunneling Protocolcomputing dictionary

<communications, protocol> (PPTP) A tunneling protocol for connecting Windows NT clients and servers over Remote Access Services (RAS). PPTP can be used to create a Virtual Private Network between computers running NT. It is an extension of PPP sponsored by Microsoft.

Microsoft Point to Point Encryption may be used with PPTP to provide an encrypted connection but PPTP itself does not use encryption.

Compare: Layer Two Tunneling Protocol.

[Origin? Standard? Document?]

(01 Apr 1998)