> I have a question about whether a NA sent to all-nodes multicast address > with the solicited bit ON is valid or invalid. Here are excerpts from the > RFC. > > For destination address in a NA: For solicited advertisements, the Source > Address of an invoking Neighbor Solicitation or, if the solicitation's > Source Address is the unspecified address, the all-nodes multicast address > > This makes it sound like a NA could be sent to the all nodes multicast > address and have the solicited bit ON. > > However, here is what is says under the solicited bit: When set, the S-bit > indicates that the advertisement was sent in response to a Neighbor > Solicitation from the Destination address. The S-bit is used as a > reachability confirmation for Neighbor Unreachability Detection. It MUST > NOT be set in multicast advertisements or in unsolicited unicast > advertisements. > > This states the solicited bit MUST NOT be set if the NA is destined for a > multicast address. > > Can you please clarify if a NA sent to all-nodes multicast address with > solicited bit ON is considered valid or invalid. Thanks!
This is covered in section 7.2.4: If the source of the solicitation is the unspecified address, the node MUST set the Solicited flag to zero and multicast the advertisement to the all-nodes address. Otherwise, the node MUST set the Solicited flag to one and unicast the advertisement to the Source Address of the solicitation. Roy -------------------------------------------------------------------- IETF IPv6 working group mailing list [EMAIL PROTECTED] Administrative Requests: https://www1.ietf.org/mailman/listinfo/ipv6 --------------------------------------------------------------------
