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$FreeBSD: stable/10/tools/tools/mctest/mctest.1 307403 2016-10-16 22:02:50Z sevan $
.Dd April 3, 2008 .Dt MCTEST 1 .Os .Sh NAME .Nm mctest .Nd "multicast test" .Sh SYNOPSIS .Nm .Op Fl i Ar interface .Op Fl g Ar group .Op Fl b Ar base port .Op Fl n Ar number .Op Fl s Ar size .Op Fl t Ar inter-packet gap .Op Fl M Ar number of clients (source only) .Op Fl m Ar my client number (sink only) .Op Fl r .Sh DESCRIPTION The .Nm command implements a multicast test which involves a source and a sink. The source sends packets to a pre-configured multicast address over the interface given as a command line argument. The sink listens for multicast packets, records the time at which they are received and then reflects them back over unicast to the source. When the source has captured all the reflected packets it prints out the round trip time of each.
p The source prints out the round trip time of packets sent to the sinks. The sink prints out the time between the packets received.
p The options are as follows: l -tag -width ".Fl i Ar interface" t Fl i Ar interface Network interface, which can be found with .Xr ifconfig 8 . t Fl g Ar group Multicast group. t Fl b Ar base port Port on which to listen. t Fl s Ar size Packet size in bytes. t Fl n Ar number Number of packets. t Fl t Ar gap Inter-packet gap in nanoseconds. t Fl M Ar clients The number of clients that are listening. t Fl m Ar my number The client's number 0, 1, etc. t Fl r This version of .Nm is the receiver aka the sink. This option MUST only be used with one copy of the program at a time. .El .Sh EXAMPLES The following is an example of a typical usage of the .Nm command:
p Source .Dl "mctest -i em0 -M 1 -s 1024 -n 100 -t 1" Sink .Dl "mctest -i em0 -m 0 -s 1024 -n 100 -r"
p Send 100 packets of 1024 bytes, with an inter-packet gap of 1 nanosecond.
p Gaps are measured with .Xr nanosleep 2 , and so are not accurate down to nanoseconds but depend on the setting of .Va kern.hz . .Sh SEE ALSO .Xr netstat 1 , .Xr nanosleep 2 , .Xr ifconfig 8 .Sh HISTORY The .Nm program first appeared in .Fx 7.0 . .Sh AUTHORS This manual page was written by .An George V. Neville-Neil Aq Mt gnn@FreeBSD.org . .Sh BUGS Should be reported to the author or to .Aq Mt net@FreeBSD.org .