mld6query(8) [freebsd man page]

MLD6QUERY(8)						    BSD System Manager's Manual 					      MLD6QUERY(8)

NAME

     mld6query -- send multicast listener query

SYNOPSIS

     mld6query [-dr] intface [maddr]

DESCRIPTION

     The mld6query utility sends an IPv6 multicast listener discovery (MLD) query packet toward the specified multicast address, maddr, toward
     interface intface.  If you omit maddr, linklocal all nodes multicast address(ff02::1) is used.

     After sending a query, mld6query waits for replies for at most 10 seconds.  If a reply is returned, mld6query prints it with its type and
     then waits for another reply.

     This program is provided only for debugging.  It is not necessary for normal use.

     With -d, mld6query will transmit MLD done packet instead of MLD query packet.  With -r, similarly, MLD report packet will be transmitted.
     -dr options are for debugging purposes only.

EXIT STATUS

     The program exits with 0 on success, non-zero on failures.

HISTORY

     The mld6query utility first appeared in WIDE/KAME IPv6 protocol stack kit.

BUGS

     The mld6query utility does not take care of multicast addresses which have non link-local scope.

BSD
								   May 17, 1998 							       BSD

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 propagate 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 pro-
     tocol 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.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 processing Group-and-Source Specific Queries (GSR).  As GSR query pro-
	     cessing 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 compati-
	     bility will be enabled until the v1 'Older Version Querier Present' timer expires.  This sysctl is normally enabled by default.

SEE ALSO

     netstat(1), sourcefilter(3), icmp6(4), inet(4), multicast(4), ifmcstat(8)

HISTORY

     The mld manual page appeared in FreeBSD 8.0.

BSD
								   April 8, 2013							       BSD