Chapter 2. Troubleshooting Layer Two Forwarding Protocol VPNs
The Layer Two Forwarding (L2F) Protocol is a Cisco proprietary protocol that facilitates the transparent forwarding of Point-to-Point Protocol (PPP) and Serial Line Internet Protocol (SLIP) across an IP backbone.
L2F, which is defined in RFC 2341, allows the separation of the functionality of the traditional Network Access Server (NAS), with call reception on a NAS, but termination of the PPP or SLIP connection on a device called a Home Gateway. The Home Gateway is geographically separated from the NAS. This means that an enterprise can outsource call reception to an Internet service provider (ISP) but still terminate PPP/SLIP connections within the corporate network. This allows the ...
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