| 释义 |
- Use
- L2F packet structure
- Other VPN protocols
- References
- External links
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]UseVirtual 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. L2F packet structure | Bits 0-12 | 13-15 | 16-23 | 24-31 |
|---|
| F | K | P | S | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | C | Ver | Protocol | Sequence (opt) | | Multiplex ID | Client ID | | Length | Payload offset (opt) | | Packet key (optional) |
Payload
| | | L2F Checksum (opt) |
Other VPN protocols- IPsec
- L2TP Layer 2 Tunneling Protocol
- OpenVPN
- PPTP Point-to-Point Tunneling Protocol
References1. ^RFC2341 on IETF.org
External links- L2F on Cisco.com
- VPDN on Cisco.com
- L2TP on Cisco.com
- RFC2341 on IETF.org
- RFC2341 on RFC Archive
{{VPN}} 1 : Cisco protocols |