L2TP definition of L2TP in the Free Online Encyclopedia.

L2TP

(Layer 2 Tunneling Protocol) A protocol from the IETF that lets remote users access the corporate network. L2TP allows a PPP session to travel over multiple links and networks. PPP is used to encapsulate IP packets from the user's PC or mobile device to the ISP, and L2TP extends that session across the Internet. L2TP was derived from Microsoft's Point-to-Point Tunneling Protocol (PPTP) and Cisco's Layer 2 Forwarding (L2F) technology. See PPTP and L2F.

From Access Concentrator to Network Server
The "L2TP Access Concentrator" (LAC) encapsulates PPP frames with L2TP headers and sends them over the Internet as UDP packets (or over an ATM, frame relay or X.25 network). At the other end, the "L2TP Network Server" (LNS) terminates the PPP session and hands the IP packets to the LAN. L2TP software can also be run in the user's PC.

Carriers also use L2TP to offer remote points of presence (POPs) to smaller ISPs. Users in remote locations dial into the carrier's local modem pool, and the carrier's LAC forwards L2TP traffic to the ISP's LNS.

L2TP and IPsec
L2TP does not include encryption (as does PPTP), but is often used with IPsec in order to provide virtual private network (VPN) connections from remote users to the corporate LAN. See PPP, VPN and IPsec.

PPP and L2TP Traffic

PPP encapsulates IP packets from the user's PC to the ISP. L2TP tunnels those packets over multiple links.

L2TP - Layer Two Tunneling Protocol

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No references found	Road warriors and telecommuters alike can use SSL or L2TP VPN to securely access their company's network without having to install any VPN client software. ZYXEL EXPANDS LINE OF UNIFIED THREAT MANAGEMENT PRODUCTS by Computer Security Update 00 This guide for network support engineers and architects covers a range of VPN technologies, including IPSec, MPLS, L2TP versions 2 and 3, PPTP, and L2F. Troubleshooting Virtual Private Networks by SciTech Book News With eight self-contained chapters organized and designed to facilitate rapid and straightforward troubleshooting, Troubleshooting Virtual Private Networks provides detailed information on addressing all common and not-so-common issues associated with IPSec VPNs, MPLS Layer-3 VPNs, any transport over MPLS (AToM)-based Layer-2 VPNs, L2TP Version 3 (L2TPv3)-based Layer-2 VPNs, L2TP Version 2 (L2TPv2) VPNs, PPTP VPNs, and L2F VPNs. Troubleshooting Virtual Private Networks by The Bookwatch	L-commerce L-cystathionine L-dopa L-fucopyranose L-fucose L-galactomethylose L-head L-head engine L-iron L-plan L-plate l-process L-rhodeose L-shore L-Soft L/D ratio L/M Lža L0 L0pht L1 cache l10n L2 cache L2CAP L2F L2TP L3 cache L3_PDU L6 LA La Baie La Belle Dame Sans Merci La Boetie, Etienne de La Boétie, Étienne de La Bour centrifugal pump La Bourdonnais, Bertrand François, comte Mahé de La Brea La Brea Tar Pits La Bruyere, Jean de La Bruyère, Jean de La Calprenède, Gautier de Costes, sieur de La Ceiba La Ceppède, Jean de La Chaise, François d'Aix de La Chapelle-Aux-Saints La Chaussee, Pierre Claude Nivelle de La Chaussée, Pierre Claude Nivelle de La Chaux-de-Fonds La Condamine La Condamine, Charles Marie de La Coruna	L2A L2B L2BGA L2C L2CAP L2CAP L2CC L2DP L2F L2F L2FFS L2FP L2G L2H L2HAC L2L L2LA L2LI L2M L2O L2P L2R L2RCOP L2SC L2T L2TDLM L2TP L2TP Access Aggregation L2TP Access Concentrator L2TP Network Server L2TPEXT L2TPv3 L2U L2VPN L2VPNS L3 L3 ALL L3 cache L3 Variant of Acute Lymphocytic Leukemia L3_PDU L33+ L33+ L33+ L337 L337 L337 L337 L337 Sp34k L337 Sp34k L337 Sp34k L33t L33t L33t L33t L33t sp33k L33t sp33k L33t sp33k

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Road warriors and telecommuters alike can use SSL or L2TP VPN to securely access their company's network without having to install any VPN client software.

ZYXEL EXPANDS LINE OF UNIFIED THREAT MANAGEMENT PRODUCTS by Computer Security Update

00 This guide for network support engineers and architects covers a range of VPN technologies, including IPSec, MPLS, L2TP versions 2 and 3, PPTP, and L2F.

Troubleshooting Virtual Private Networks by SciTech Book News

With eight self-contained chapters organized and designed to facilitate rapid and straightforward troubleshooting, Troubleshooting Virtual Private Networks provides detailed information on addressing all common and not-so-common issues associated with IPSec VPNs, MPLS Layer-3 VPNs, any transport over MPLS (AToM)-based Layer-2 VPNs, L2TP Version 3 (L2TPv3)-based Layer-2 VPNs, L2TP Version 2 (L2TPv2) VPNs, PPTP VPNs, and L2F VPNs.

Troubleshooting Virtual Private Networks by The Bookwatch