1.\" $KAME: ifmcstat.8,v 1.6 2002/10/31 04:23:43 suz Exp $ 2.\" 3.\" Copyright (c) 2007-2009 Bruce Simpson. 4.\" Copyright (C) 1995, 1996, 1997, 1998, and 1999 WIDE Project. 5.\" All rights reserved. 6.\" 7.\" Redistribution and use in source and binary forms, with or without 8.\" modification, are permitted provided that the following conditions 9.\" are met: 10.\" 1. Redistributions of source code must retain the above copyright 11.\" notice, this list of conditions and the following disclaimer. 12.\" 2. Redistributions in binary form must reproduce the above copyright 13.\" notice, this list of conditions and the following disclaimer in the 14.\" documentation and/or other materials provided with the distribution. 15.\" 3. Neither the name of the project nor the names of its contributors 16.\" may be used to endorse or promote products derived from this software 17.\" without specific prior written permission. 18.\" 19.\" THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 20.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22.\" ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 23.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29.\" SUCH DAMAGE. 30.\" 31.\" $FreeBSD$ 32.\" 33.Dd February 15, 2009 34.Dt IFMCSTAT 8 35.Os 36.Sh NAME 37.Nm ifmcstat 38.Nd dump multicast group management statistics per interface 39.Sh SYNOPSIS 40.Nm 41.Op Fl i Ar interface 42.Op Fl f Ar address-family 43.Op Fl v 44.Op Fl M Ar core 45.Op Fl N Ar system 46.\" 47.Sh DESCRIPTION 48The 49.Nm 50command dumps multicast group information from the kernel. 51.Pp 52The following options are supported: 53.Bl -tag -width Fl 54.It Fl i Ar interface 55specifies the interface to be displayed. 56.Pp 57.It Fl f Ar address-family 58specifies the address family to be displayed; 59.Ar inet , 60.Ar inet6 61and 62.Ar link 63are supported. 64.It Fl v 65specifies that link-layer memberships should be printed; 66they are suppressed by default. 67It may not be specified for 68.Fl f Ar link . 69.El 70.Pp 71The following options are only available if 72.Nm 73has been built with support for 74.Xr kvm 3 : 75.Bl -tag -width Fl 76.It Fl M Ar core 77extracts values associated with the name list from the specified core, 78instead of the default 79.Pa /dev/kmem . 80.It Fl N Ar system 81extracts the name list from the specified kernel instead of the 82default, which is the kernel image the system has booted from. 83.El 84.Sh IMPLEMENTATION NOTES 85When run with the 86.Fl v 87option, 88.Nm 89may print multicast MAC addresses twice if they are 90referenced by a layer 3 protocol. 91.Pp 92When run with 93.Xr kvm 3 94support, 95the names of all interfaces configured in the system will be 96printed in the first column of output, even if no multicast 97group memberships are present on those interfaces. 98The output may also be slightly different, as the kernel 99data structures are being traversed with minimal post-processing 100of the output. 101.Pp 102When built without 103.Xr kvm 3 104support, the information displayed by 105.Nm 106is more limited. 107This support is recommended for debugging purposes. 108It requires super-user privilege if used to inspect a running kernel. 109.Xr kvm 3 110will be used by default if 111.Nm 112is run with super-user privileges. 113.Sh SEE ALSO 114.Xr getifaddrs 3 , 115.Xr getifmaddrs 3 , 116.Xr kvm 3 , 117.Xr netstat 8 118