/usr/bin/sctp_darn: unrecognized option '--help'
Usage: /usr/bin/sctp_darn -H <localhost> -P <localport> [-h <remotehost>] [-p <remoteport>] -l|s
 -H, --local		specify one of the local addresses,
 -P, --local-port	specify the port number for local addresses,
 -h, --remote		specify the peer address,
 -p, --remote-port	specify the port number for the peer address,
 -l, --listen		print messages received from the peer,
 -s, --send		send messages to the peer,
 -B, --bindx-add	add the specified address(es) as additional bind
			addresses to the local socket. Multiple addresses can
			be specified by using this argument multiple times.
			For example, '-B 10.0.0.1 -B 20.0.0.2'.
 -b, --bindx-rem	remove the specified address(es) from the bind
			addresses of the local socket. Multiple addresses can
			be specified by using this argument multiple times.
			For example, '-b 10.0.0.1 -b 20.0.0.2'.
 -c, --connectx		use the specified address(es) for connection to the
			peer socket. Multiple addresses can be specified by
			using this argument multiple times.
			For example, '-c 10.0.0.1 -c 20.0.0.2'.
			This option is incompatible with the -h option.
 -I			use the interactive mode.
 -i			setup the specified number of endpoints by using the
			specified local host (-H) and local port (-P). The port
			number will be incremented by one for each additional
			endpoint.  All of these endpoints will be listening.
			If a remote host (-h) and a remote port are also
			specified, the first endpoint will start sending fixed
			sized messages to the remote host.
 -m			specify the sockopt sndbuf/rcvbuf size.
 -n			set the socket(s) to be in the non-blocking mode.
			collect messages from stdin and deliver them to the
			peer,
--use-poll		use system call poll() for polling among the
			number of endpoints specified by the -i option. Without
			this option, select() would be used as default.
 -t			use SOCK_STREAM tcp-style sockets.
 -z			specify the message size to be sent.  The default
			message size generated would be 16K.
 --interface="ifname"	select interface for sin6_scope_id.