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RFC 7788, "Home Networking Control Protocol", April 2016

Note: This RFC has been updated by RFC 8375

Source of RFC: homenet (int)
See Also: RFC 7788 w/ inline errata

Errata ID: 5113
Status: Verified
Type: Technical
Publication Format(s) : TEXT
Reported By: Denis Ovsienko
Date Reported: 2017-09-13
Verifier Name: Eric Vyncke
Date Verified: 2021-01-03

Section 10 says: 

10.2.2.  DHCPv6-Data TLV

    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
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |    Type: DHCPv6-Data (37)     |          Length: > 0          |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

[...]

10.2.3.  DHCPv4-Data TLV

    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
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |     Type: DHCPv4-Data (38)    |          Length: > 0          |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

It should say:

10.2.2.  DHCPv6-Data TLV

    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
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |    Type: DHCPv6-Data (38)     |          Length: > 0          |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

[...]

10.2.3.  DHCPv4-Data TLV

    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
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |     Type: DHCPv4-Data (37)    |          Length: > 0          |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

Notes:

Section 13 (IANA Considerations) of the document says:

37: DHCPv4-Data

38: DHCPv6-Data

Those code points from Section 13 are in the "HNCP TLV Types" IANA registry as well as in the current source code of shncpd and tcpdump. The code points shown in Sections 10.2.2 and 10.2.3 were likely swapped by mistake.

-- Verifier note --
The IANA registry for HNCP TLV types (https://www.iana.org/assignments/dncp-registry/dncp-registry.xhtml#hncp-tlv-types) has indeed 37 for DHCPv4 and the open source SHNCPD has the same https://github.com/jech/shncpd/blob/master/receive.c

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