Main Mode Negotiation

Main mode negotiation determines encryption key material and security protection for use in protecting subsequent Main mode or Quick mode communications. Main mode negotiation occurs in the following steps:

  1. Negotiation of protection suites

  2. A Diffie-Hellman exchange

  3. Authentication

Main mode negotiation consists of either five or six ISAKMP messages: three sent by the initiator and two or three sent by the responder. For examples of main mode negotiation, see the following:

  • Frames 1–5 of Capture 18-01 in the \Captures folder on the companion CD-ROM (Frames 4 and 5 have encrypted ISAKMP payloads)

  • Frames 1–6 of Capture 18-02 (Frames 5 and 6 have encrypted ISAKMP payloads)

  • Frames 1–5 of Capture 18-03 (Frames 4 and 5 have encrypted ISAKMP ...

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