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       mcfirst - check if you can receive IPv4/IPv6 multicast


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


       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


       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.


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

       dbeacon(1) a distributed beacon multicast implementation.


       Please report them to Stig Venaas <>,  the  author  of
       this tool.


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

                                 User Manuals                       mcfirst(1)