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L2TP

Last modified: Wednesday, February 25, 2004

Short for Layer Two (2) Tunneling Protocol, an extension to the PPP protocol that enables ISPs to operate Virtual Private Networks (VPNs). L2TP merges the best features of two other tunneling protocols: PPTP from Microsoft and L2F from Cisco Systems. Like PPTP, L2TP requires that the ISP's routers support the protocol.

RFC 2661
Full text of the L2TP RFC.

Related Categories

Internet Access
Internet Protocols

Related Terms

dial-up access
DLSw
IPsec
Layer Two Forwarding
PPTP
tunneling
VPN

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