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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