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RFC 3947, "Negotiation of NAT-Traversal in the IKE", January 2005

Source of RFC: ipsec (sec)

Errata ID: 4936

Status: Reported
Type: Technical

Reported By: Nikolai Malykh
Date Reported: 2017-02-16

Section 5.2 says:

   The NAT-OA payloads are sent inside the first and second packets of
   Quick Mode.  The initiator MUST send the payloads if it proposes any
   UDP-Encapsulated-Transport mode, and the responder MUST send the
   payload only if it selected UDP-Encapsulated-Transport mode.  It is
   possible that the initiator sends the NAT-OA payload but proposes
   both UDP-Encapsulated transport and tunnel mode.  Then the responder
   selects the UDP-Encapsulated tunnel mode and does not send the NAT-OA
   payload back.

It should say:

   The NAT-OA payloads are sent inside the first and second packets of
   Quick Mode.  The initiator MUST send the payloads if it proposes any
   UDP-Encapsulated mode, and the responder MUST send the
   payload only if it selected UDP-Encapsulated-Transport mode.  It is
   possible that the initiator sends the NAT-OA payload but proposes
   both UDP-Encapsulated transport and tunnel mode.  Then the responder
   selects the UDP-Encapsulated tunnel mode and does not send the NAT-OA
   payload back.

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