1.3 Overview

  • Article

The Link Local Multicast Name Resolution (LLMNR) protocol, specified in [RFC4795] does not send or respond to unicast queries in TCP and does not support Extension Mechanisms for DNS (EDNS0) [RFC2671]. This profile enables name resolution on the link local scenarios in which name resolution is not possible on the conventional DNS local link, as specified in [RFC1035].

Link Local Multicast Name Resolution queries are sent to and received on port 5355, as specified in [RFC4795]. This profile of LLMNR differs from LLMNR defined in [RFC4795], principally in the area of transport. Specifically, in the following areas:

  • [RFC4795] requires TCP, as specified in [RFC793], support, but TCP support is optional in this profile.

  • [RFC4795] requires EDNS0 [RFC2671] support, but EDNS0 support is optional in this profile.