Link-Local Multicast Name Resolution

The Link-Local Multicast Name Resolution (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, Windows Server 2008, Windows 7, Windows 8 and Windows 10.[1] It is also implemented by systemd-resolved on Linux.[2] LLMNR is defined in RFC 4795.

Protocol details

In responding to queries, responders listen on UDP port 5355 on the following link-scope Multicast address:

The responders also listen on TCP port 5355 on the unicast address that the host uses to respond to queries.

Packet header structure

Bit offset 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
0 ID
16 QR Opcode C TC T Z Z Z Z RCODE
32 QDCOUNT
48 ANCOUNT
64 NSCOUNT
80 ARCOUNT

See also

References

  1. LLMNR: The Cable Guy
  2. "systemd 216 available". Retrieved 2015-08-10.

External links

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