Multicast Listener Discovery

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Protocol for discovering IPv6 multicast listeners

Multicast Listener Discovery (MLD) is a component of the Internet Protocol Version 6 (IPv6) suite. MLD is used by IPv6 routers for discovering multicast listeners on a directly attached link, much like Internet Group Management Protocol (IGMP) is used in IPv4. The protocol is embedded in ICMPv6 instead of using a separate protocol. MLDv1 is similar to IGMPv2 and MLDv2 similar to IGMPv3.

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Protocol

The following ICMPv6 message types are used:

ICMPv6 message type values³

Message	Type value
Multicast Listener Query	130
MLDv1 Multicast Listener Report	131
MLDv2 Multicast Listener Report	143
Multicast Listener Done	132

Support

Several operating systems support MLDv2:

Windows Vista and later⁴
FreeBSD since release 8.0⁵
The Linux kernel since 2.5.68⁶
macOS ⁷

References

S. Deering; W. Fenner; B. Haberman (October 1999). Multicast Listener Discovery (MLD) for IPv6. Network Working Group. doi:10.17487/RFC2710. RFC 2710. Proposed Standard. Updated by RFC 3590 and 3810. /wiki/Steve_Deering ↩
R. Vida; L. Costa, eds. (June 2004). Multicast Listener Discovery Version 2 (MLDv2) for IPv6. Network Working Group. doi:10.17487/RFC3810. RFC 3810. Proposed Standard. Updates RFC 2710. Updated by RFC 4604. https://datatracker.ietf.org/doc/html/rfc3810 ↩
R. Vida; L. Costa, eds. (June 2004). Multicast Listener Discovery Version 2 (MLDv2) for IPv6. Network Working Group. doi:10.17487/RFC3810. RFC 3810. Proposed Standard. Updates RFC 2710. Updated by RFC 4604. https://datatracker.ietf.org/doc/html/rfc3810 ↩
"MLD and IGMP Using Windows Sockets". Windows Sockets 2. 2011-09-16. http://msdn.microsoft.com/en-us/library/windows/desktop/ms738558(v=vs.85).aspx ↩
"mld(4): Multicast Listener Discovery Protocol". FreeBSD Kernel Interfaces Manual. 2009-05-27. http://www.FreeBSD.org/cgi/man.cgi?query=mld ↩
Torvalds, Linus (2003-04-19). "Linux 2.5.68 ChangeLog". /wiki/Linus_Torvalds ↩
IPv6Hardening Guide for OS-X (PDF), 2015-01-29, retrieved 2021-05-23 http://ipv6now.com.au/primers/ERNW_Hardening_IPv6_MacOS-X_v1_0.pdf ↩