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32 .Nd "multicast filter overload test"
41 command implements a multicast test which grabs and holds
42 N multicast addresses.
43 The purpose of the test is to see what
44 happens when a network interface is no longer able to filter
45 multicasts in hardware and has to switch to promiscuous or
46 multicast promiscuous mode.
47 A successful test does not have any
48 result, but an unsuccessful test will have deleterious side effects.
50 The options are as follows:
51 .Bl -tag -width ".Fl i Ar interface"
53 Network interface, which can be found with
58 Number of groups to join.
61 The following is an example of a typical usage
66 .Dl "mcgrab -i em0 -g 239.255.255.1 -n 1024"
75 program first appeared in
79 manual page was written by
80 .An George V. Neville-Neil Aq gnn@FreeBSD.org .
82 Should be reported to the author or to