(Layer 2 Forwarding) A protocol from Cisco for creating virtual private dial-up networks (VPNs) over the Internet. It was combined with PPTP to create the L2TP protocol. See L2TP.
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Layer 2 Forwarding Protocol
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L2F, or Layer 2 Forwarding, is a tunneling protocol developed by Cisco Systems, Inc. to establish Virtual Private Network connections over the Internet. L2F does not provide encryption or confidentiality by itself; It relies on the protocol being tunneled to provide privacy. L2F was specifically designed to tunnel Point-to-Point Protocol (PPP) traffic.[1]
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Use
Virtual dial-up allows many separate and autonomous protocol domains to share common access infrastructure including modems, Access Servers, and ISDN routers. RFCs prior to 2341 have specified protocols for supporting IP dial-up via SLIP and multiprotocol dial-up via PPP.
Other VPN Protocols
- IPsec
- L2TP Layer 2 Tunneling Protocol
- PLIP Parallel Line Internet Protocol
- PPTP Point-to-Point Tunneling Protocol
- SSL/TLS Secure Sockets Layer / Transport Layer Security
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