Subject: [magma] Query on valid destination addresses for MLD

From: Princy Elizabeth <[email-masked]>
Date: Wed, 30 Aug 2006 23:55:02 -0700 (PDT)

Hi,
   
  I have a doubt on the permitted destination addresses for MLD reports and queries. The RFC states the following:
   
    Destination Addresses for Queries
   
  In MLDv2, General Queries are sent to the link-scope all-nodes multicast address (FF02::1). Multicast Address Specific and Multicast Address and Source Specific Queries are sent with an IP destination address equal to the multicast address of interest. *However*, a node MUST accept and process any Query whose IP Destination Address field contains *any* of the addresses (unicast or multicast) assigned to the interface on which the Query arrives. This might be useful, e.g., for debugging purposes.
   
  Destination Addresses for Reports
   
  Version 2 Multicast Listener Reports are sent with an IP destination address of FF02:0:0:0:0:0:0:16, to which all MLDv2-capable multicast routers listen (see section 11 for IANA considerations related to this special destination address). A node that operates in version 1 compatibility mode (see details in section 8) sends version 1 Reports to the multicast address specified in the Multicast Address field of the Report. In addition, a node MUST accept and process any version 1 Report whose IP Destination Address field contains *any* of the IPv6 addresses (unicast or multicast) assigned to the interface on which the Report arrives. This might be useful, e.g., for debugging purposes.
   
  However, I do not understand why queries/reports addressed to any multicast address(and not just the multicast address of interest) assigned to the interface should be accepted? Also, how would accepting queries/reports addressed to any of the unicast/multicast addresses assigned to the interface help in debugging purposes?
   
  Thanks,
  Princy

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