The
command dumps multicast group information from the kernel.
The following options are supported:
-i interface
specifies the interface to be displayed.
-f address-family
specifies the address-family to be displayed; currently only
inet
and
inet6
are supported.
The following options are only available if
has been built with support for
kvm(3).
-M core
extracts values associated with the name list from the specified core,
instead of the default
/dev/kmem
-N system
extracts the name list from the specified kernel instead of the
default, which is the kernel image the system has booted from.
system
This is the same as specifying
-N system
This usage is deprecated; it is supported only for backwards compatibility.
IMPLEMENTATION NOTES
When built without
kvm(3)
support, the information displayed by
is more limited.
This support is recommended for debugging purposes.
It requires superuser privilege if used to inspect a running kernel.
When run without using
kvm(3)
support,
may print multicast MAC addresses twice if they are
referenced by a layer 3 protocol.
When run with
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
addresses are configured on those interfaces.
