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-.\" $KAME: ifmcstat.8,v 1.6 2002/10/31 04:23:43 suz Exp $
-.\"
-.\" Copyright (c) 2007-2009 Bruce Simpson.
-.\" Copyright (C) 1995, 1996, 1997, 1998, and 1999 WIDE Project.
-.\" All rights reserved.
-.\"
-.\" Redistribution and use in source and binary forms, with or without
-.\" modification, are permitted provided that the following conditions
-.\" are met:
-.\" 1. Redistributions of source code must retain the above copyright
-.\" notice, this list of conditions and the following disclaimer.
-.\" 2. Redistributions in binary form must reproduce the above copyright
-.\" notice, this list of conditions and the following disclaimer in the
-.\" documentation and/or other materials provided with the distribution.
-.\" 3. Neither the name of the project nor the names of its contributors
-.\" may be used to endorse or promote products derived from this software
-.\" without specific prior written permission.
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
-.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-.\" ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
-.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
-.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
-.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
-.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
-.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
-.\" SUCH DAMAGE.
-.\"
-.\" $FreeBSD$
-.\"
-.Dd May 27, 2009
-.Dt IFMCSTAT 8
-.Os
-.Sh NAME
-.Nm ifmcstat
-.Nd dump multicast group management statistics per interface
-.Sh SYNOPSIS
-.Nm
-.Op Fl i Ar interface
-.Op Fl f Ar address-family
-.Op Fl v
-.Op Fl K
-.Op Fl M Ar core
-.Op Fl N Ar system
-.\"
-.Sh DESCRIPTION
-The
-.Nm
-command dumps multicast group information from the kernel.
-.Pp
-The following options are supported:
-.Bl -tag -width Fl
-.It Fl i Ar interface
-specifies the interface to be displayed.
-.Pp
-.It Fl f Ar address-family
-specifies the address family to be displayed;
-.Ar inet ,
-.Ar inet6
-and
-.Ar link
-are supported.
-.It Fl v
-specifies that link-layer memberships should be printed;
-they are suppressed by default.
-It may not be specified for
-.Fl f Ar link .
-Source lists for each group will also be printed.
-.Pp
-If specified twice, and
-.Xr kvm 3
-is in use, the control plane timers for each interface
-and the source list counters for each group
-will also be printed.
-.El
-.Pp
-The following options are only available if
-.Nm
-has been built with support for
-.Xr kvm 3 :
-.Bl -tag -width Fl
-.It Fl K
-attempts to use
-.Xr kvm 3
-to retrieve the multicast group information.
-.It Fl M Ar core
-extracts values associated with the name list from the specified core,
-instead of the default
-.Pa /dev/kmem .
-.It Fl N Ar system
-extracts the name list from the specified kernel instead of the
-default, which is the kernel image the system has booted from.
-.El
-.Sh IMPLEMENTATION NOTES
-.Nm
-will always print the embedded scope IDs of IPv6 multicast group
-memberships.
-This is because memberships are always scoped to an interface.
-.Pp
-When run with the
-.Fl v
-option,
-.Nm
-may print multicast MAC addresses twice if they are
-referenced by a layer 3 protocol.
-.Pp
-When run with
-.Xr kvm 3
-support,
-the names of all interfaces configured in the system will be
-printed in the first column of output, even if no multicast
-group memberships are present on those interfaces.
-The output may also be slightly different, as the kernel
-data structures are being traversed with minimal post-processing
-of the output.
-.Pp
-When built without
-.Xr kvm 3
-support, the information displayed by
-.Nm
-is more limited.
-This support is recommended for debugging purposes.
-It requires super-user privilege if used to inspect a running kernel.
-.Pp
-.Sh SEE ALSO
-.Xr getifaddrs 3 ,
-.Xr getifmaddrs 3 ,
-.Xr kvm 3 ,
-.Xr netstat 8
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