mcfirst - check if you can receive IPv4/IPv6 multicast

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

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.  mcfirstwillbydefaultexitwhenthefirstpacketisreceived,andprinthowlongitwaited.

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

                                                  User Manuals                                        mcfirst(1)

       mcfirst - check if you can receive IPv4/IPv6 multicast

       The options are as follows.

       -4     Force IPv4

       -6     Force IPv6

       -v     Print version

       -r     Print rate information only

       -Iinterface
              Interface to join on

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

       -ttime
              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.

mcfirst [ -46vr ] [ -Iinterface ] [ -ccount ] [ -ttime ] [ source ] groupport