xref: /freebsd/usr.sbin/ifmcstat/ifmcstat.8 (revision d10910e6cee0dca8be3d5a7fdbe404a15d9e7b52)

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.Dd February 28, 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 IGMP timers for each interface
and the IGMP 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
forces the use of
.Xr kvm 3
to be disabled.
.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
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
The
.Xr kvm 3
back-end will be used by default if
.Nm
is run with super-user privileges, unless the
.Fl K
option is specified.
.Sh SEE ALSO
.Xr getifaddrs 3 ,
.Xr getifmaddrs 3 ,
.Xr kvm 3 ,
.Xr netstat 8