Link-local Multicast Name Resolution

The Link Local Multicast Name Resolution (or LLMNR) is a protocol based on the Domain Name System (DNS) packet format that allows both IPv4 and IPv6 hosts to perform name resolution for hosts on the same local link. It is included in Windows Vista and Windows Server 2008 [ [http://www.microsoft.com/technet/community/columns/cableguy/cg1106.mspx LLMNR: The Cable Guy] ]

Protocol details

In responding to queries, responders listen on UDP port 5355 on the following link-scope Multicast address:
* IPv4 - 224.0.0.252
* IPv6 - FF02:0:0:0:0:0:1:3 (this notation can be abbreviated as FF02::1:3)The responders also listen on TCP port 5355 on the unicast address that the host uses to respond to queries.

Packet header structure

* ID - A 16-bit identifier assigned by the program that generatesany kind of query.
* QR - Query/Response.
* OPCODE - A 4-bit field that specifies the kind of query in thismessage. This value is set by the originator of a query andcopied into the response. This specification defines thebehavior of standard queries and responses (opcode value ofzero). Future specifications may define the use of otheropcodes with LLMNR.
* C - Conflict.
* TC - TrunCation.
* T - Tentative.
* Z - Reserved for future use.
* RCODE - Response code.
* QDCOUNT - An unsigned 16-bit integer specifying the number of entriesin the question section.
* ANCOUNT - An unsigned 16-bit integer specifying the number of resourcerecords in the answer section.
* NSCOUNT - An unsigned 16-bit integer specifying the number of nameserver resource records in the authority records section.
* ARCOUNT - An unsigned 16-bit integer specifying the number of resourcerecords in the additional records section.

References

External links

* [http://www.microsoft.com/technet/community/columns/cableguy/cg1106.mspx TechNet Link-Local Multicast Name Resolution]

RFCs

* RFC 4795, Informational, Link-Local Multicast Name Resolution (LLMNR)

See also

* Zeroconf


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