mld man page on FreeBSD

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MLD(4)			 BSD Kernel Interfaces Manual			MLD(4)

NAME
     mld — Multicast Listener Discovery Protocol

SYNOPSIS
     #include <sys/types.h>
     #include <sys/socket.h>
     #include <netinet/in.h>
     #include <netinet/in_systm.h>
     #include <netinet/ip6.h>
     #include <netinet/icmp6.h>
     #include <netinet6/mld6.h>

     int
     socket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6);

DESCRIPTION
     MLD is a control plane protocol used by IPv6 hosts and routers to propa‐
     gate multicast group membership information.  Normally this protocol is
     not used directly, except by the kernel itself, in response to multicast
     membership requests by user applications.	Multicast routing protocol
     daemons may open a raw socket to directly interact with mld and receive
     membership reports.

     As of FreeBSD 8.0, MLD version 2 is implemented.  This adds support for
     Source-Specific Multicast (SSM), whereby applications may communicate to
     upstream multicast routers that they are only interested in receiving
     multicast streams from particular sources.	 The retransmission of state-
     change reports adds some robustness to the protocol.

SYSCTL VARIABLES
     net.inet6.mld.stats
	     This opaque read-only variable exposes the stack-wide MLDv2 pro‐
	     tocol statistics to netstat(1).

     net.inet6.mld.ifinfo
	     This opaque read-only variable exposes the per-link MLDv2 status
	     to ifmcstat(8).

     net.inet6.mld.gsrdelay
	     This variable specifies the time threshold, in seconds, for pro‐
	     cessing Group-and-Source Specific Queries (GSR).  As GSR query
	     processing requires maintaining state on the host, it may cause
	     memory to be allocated, and is therefore a potential attack point
	     for Denial-of-Service (DoS).  If more than one GSR query is
	     received within this threshold, it will be dropped, to mitigate
	     the potential for DoS.

     net.inet6.mld.v1enable
	     If this variable is non-zero, then MLDv1 membership queries (and
	     host reports) will be processed by this host, and backwards com‐
	     patibility will be enabled until the v1 'Older Version Querier
	     Present' timer expires.  This sysctl is normally enabled by
	     default.

SEE ALSO
     ifmcstat(8), inet(4), multicast(4), netstat(1), sourcefilter(3)

HISTORY
     The mld manual page appeared in FreeBSD 8.0.

BSD				 May 27, 2009				   BSD
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