Query on valid destination addresses for MLD
Princy Elizabeth <[email protected]>
| Newsgroups | gmane.ietf.magma |
|---|---|
| Message-ID | <[email protected]> |
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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