Please don't send HTML, hard for me to read and quote. Clients should definitely do an MLD join for this group (just as they should for the solicited multicast address used for ND). My experience is also that clients do join both the "solicited" and the "name-lookup". I would be interested to hear of any implementations that don't. If not, the job for snooping switches will be pretty difficult. In general we need to make it very clear that one always needs to do MLD joins, except for ff02::1.
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