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mcfirst(1)							    mcfirst(1)

NAME
       mcfirst - check if you can receive IPv4/IPv6 multicast

SYNOPSIS
       mcfirst	[ -46vr ] [ -I interface ] [ -c count ] [ -t time ] [ source ]
       group port

DESCRIPTION
       mcfirst can be used to check whether one can receive multicast  packets
       from  a	host.  The  host  may  send any type of multicast packets, any
       application, IPv4 or IPv6, ASM or SSM.	mcfirst	 joins	the  specified
       (source) and group, and listens to the specified port.  mcfirst will by
       default exit when the first packet is received, and print how  long  it
       waited.

OPTIONS
       The options are as follows.

       -4     Force IPv4

       -6     Force IPv6

       -v     Print version

       -r     Print rate information only

       -I interface
	      Interface to join on

       -c count
	      Stop  after  receiving  count  packets. Default is 1 unless time
	      limit is specified

       -t time
	      Exit after time seconds. Default is  to  exit  after  the	 first
	      packet.  If both count and time are specified, mcfirst will exit
	      as soon as one of them is satisfied.

SEE ALSO
       ssmping(1) a tool for checking whether can receive SSM.

       dbeacon(1) a distributed beacon multicast implementation.

BUGS
       Please report them to Stig Venaas <venaas@uninett.no>,  the  author  of
       this tool.

HISTORY
       mcfirst	was  developed	by  Stig  Venaas  during the early days of the
       m6bone, the IPv6 multicast backbone.

				 User Manuals			    mcfirst(1)

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