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RFC 2661 - 第二层隧道协议 (L2TP)

发布日期: 1999年8月
状态: 标准跟踪协议 (Standards Track)
作者: W. Townsley, A. Valencia (Cisco Systems), A. Rubens (Ascend Communications), G. Pall, G. Zorn (Microsoft Corporation), B. Palter (Redback Networks)

摘要 (Abstract)​

本文档描述了第二层隧道协议 (Layer Two Tunneling Protocol, L2TP). STD 51, RFC 1661 规定了通过 PPP 进行多协议访问. L2TP 促进了 PPP 数据包跨越中间网络的隧道传输，以一种对终端用户和应用程序尽可能透明的方式.

目录 (Contents)​

  • 1. Introduction (简介)
    • 1.1 Specification of Requirements (需求规范)
    • 1.2 Terminology (术语)
  • 2. Topology (拓扑结构)
  • 3. Protocol Overview (协议概览)
    • 3.1 L2TP Header Format (L2TP 头部格式)
    • 3.2 Control Message Types (控制消息类型)
  • 4. Control Message Attribute Value Pairs (控制消息属性值对)
    • 4.1 AVP Format (AVP 格式)
    • 4.2 Mandatory AVPs (强制性 AVP)
    • 4.3 Hiding of AVP Attribute Values (AVP 属性值隐藏)
    • 4.4 AVP Summary (AVP 摘要)
      • 4.4.1 AVPs Applicable To All Control Messages (适用于所有控制消息的 AVP)
      • 4.4.2 Result and Error Codes (结果和错误代码)
      • 4.4.3 Control Connection Management AVPs (控制连接管理 AVP)
      • 4.4.4 Call Management AVPs (呼叫管理 AVP)
      • 4.4.5 Proxy LCP and Authentication AVPs (代理 LCP 和认证 AVP)
      • 4.4.6 Call Status AVPs (呼叫状态 AVP)
  • 5. Protocol Operation (协议操作)
    • 5.1 Control Connection Establishment (控制连接建立)
      • 5.1.1 Tunnel Authentication (隧道认证)
    • 5.2 Session Establishment (会话建立)
      • 5.2.1 Incoming Call Establishment (入站呼叫建立)
      • 5.2.2 Outgoing Call Establishment (出站呼叫建立)
    • 5.3 Forwarding PPP Frames (转发 PPP 帧)
    • 5.4 Using Sequence Numbers on the Data Channel (在数据通道上使用序列号)
    • 5.5 Keepalive (Hello) (保活机制)
    • 5.6 Session Teardown (会话拆除)
    • 5.7 Control Connection Teardown (控制连接拆除)
    • 5.8 Reliable Delivery of Control Messages (控制消息的可靠传递)
  • 6. Control Connection Protocol Specification (控制连接协议规范)
    • 6.1 Start-Control-Connection-Request (SCCRQ)
    • 6.2 Start-Control-Connection-Reply (SCCRP)
    • 6.3 Start-Control-Connection-Connected (SCCCN)
    • 6.4 Stop-Control-Connection-Notification (StopCCN)
    • 6.5 Hello (HELLO)
    • 6.6 Incoming-Call-Request (ICRQ)
    • 6.7 Incoming-Call-Reply (ICRP)
    • 6.8 Incoming-Call-Connected (ICCN)
    • 6.9 Outgoing-Call-Request (OCRQ)
    • 6.10 Outgoing-Call-Reply (OCRP)
    • 6.11 Outgoing-Call-Connected (OCCN)
    • 6.12 Call-Disconnect-Notify (CDN)
    • 6.13 WAN-Error-Notify (WEN)
    • 6.14 Set-Link-Info (SLI)
  • 7. Control Connection State Machines (控制连接状态机)
    • 7.1 Control Connection Protocol Operation (控制连接协议操作)
    • 7.2 Control Connection States (控制连接状态)
      • 7.2.1 Control Connection Establishment (控制连接建立)
    • 7.3 Timing considerations (时序考虑)
    • 7.4 Incoming calls (入站呼叫)
      • 7.4.1 LAC Incoming Call States (LAC 入站呼叫状态)
      • 7.4.2 LNS Incoming Call States (LNS 入站呼叫状态)
    • 7.5 Outgoing calls (出站呼叫)
      • 7.5.1 LAC Outgoing Call States (LAC 出站呼叫状态)
      • 7.5.2 LNS Outgoing Call States (LNS 出站呼叫状态)
    • 7.6 Tunnel Disconnection (隧道断开)
  • 8. L2TP Over Specific Media (特定媒体上的 L2TP)
    • 8.1 L2TP over UDP/IP
    • 8.2 IP
  • 9. Security Considerations (安全考虑)
    • 9.1 Tunnel Endpoint Security (隧道端点安全)
    • 9.2 Packet Level Security (数据包级安全)
    • 9.3 End to End Security (端到端安全)
    • 9.4 L2TP and IPsec
    • 9.5 Proxy PPP Authentication (代理 PPP 认证)
  • 10. IANA Considerations (IANA 注册事项)
    • 10.1 AVP Attributes
    • 10.2 Message Type AVP Values
    • 10.3 Result Code AVP Values
      • 10.3.1 Result Code Field Values
      • 10.3.2 Error Code Field Values
    • 10.4 Framing Capabilities & Bearer Capabilities
    • 10.5 Proxy Authen Type AVP Values
    • 10.6 AVP Header Bits
  • 11. References (参考文献)
  • 12. Acknowledgments (致谢)
  • 13. Authors' Addresses (作者地址)

附录 (Appendices)​

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