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Status: Verified (1)

RFC6886, "NAT Port Mapping Protocol (NAT-PMP)", April 2013

Source of RFC: INDEPENDENT

Errata ID: 3618

Status: Verified
Type: Technical

Reported By: Stuart Cheshire
Date Reported: 2013-05-13
Verifier Name: Nevil Brownlee
Date Verified: 2013-05-23

Section 3.5 says:

   If the version in the request is not zero, then the NAT-PMP server
   MUST return the following "Unsupported Version" error response to the
   client:

    0                   1                   2                   3
    0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   | Vers = 0      | OP = 0        | Result Code = 1               |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   | Seconds Since Start of Epoch (in network byte order)          |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

It should say:

   If the version in the request is not zero, then the NAT-PMP server
   MUST return the following "Unsupported Version" error response to the
   client:

    0                   1                   2                   3
    0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   | Vers = 0      | OP = 128      | Result Code = 1               |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   | Seconds Since Start of Epoch (in network byte order)          |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

Notes:

Since this is a response, the top bit of the opcode SHOULD be set, making the opcode value 128. However, the document shows "OP = 0", which is a mistake. In all responses the top bit of the opcode SHOULD be set. However, some implementations have the same mistake as the document and do not do this. Others sensibly set the top bit since this is a reply. Hence, clients sending PCP requests to NAT-PMP servers should expect to receive both forms of reply.


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