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Status: Reported (1)

RFC 6106, "IPv6 Router Advertisement Options for DNS Configuration", November 2010

Source of RFC: 6man (int)

Errata ID: 4864

Status: Reported
Type: Technical

Reported By: Robin Johnson
Date Reported: 2016-11-14

Section 5.2. says:

Length:
8-bit unsigned integer.  The length of the option
(including the Type and Length fields) is in units of
8 octets.  The minimum value is 2 if at least one
domain name is contained in the option.  The Length
field is set to a multiple of 8 octets to accommodate
all the domain names in the field of Domain Names of
DNS Search List.

It should say:

Length:
8-bit unsigned integer.  The length of the option
(including the Type and Length fields) is in units of
8 octets.  The minimum value is 2 if at least one
domain name is contained in the option.  The Length
field is set to a multiple of 8 octets to accommodate
all the domain names in the field of Domain Names of
DNS Search List.

The exact maximum value supported by a given network
is dictated by the MTU of the link, because the
Router Advertisement MUST NOT be fragmented as per
RFC6980#section5. The lowest possible MTU of 1280
results in a lower bound for the maximum value of 148
(representing 1192 octets).

Notes:

RFC6980 section 5 declares that nodes MUST NOT send fragmented Router Advertisements.

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