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MCASTREAD(1)           DragonFly General Commands Manual          MCASTREAD(1)

NAME
     mcastread - read multicast packets forever

SYNOPSIS
     mcastread [-v46] [-s source] interface address port [file]

DESCRIPTION
     The mcastread utility reads UDP multicast data continuously, and writing
     the data to the standard output.  You must specify the interface,
     multicast address and UDP port number or service name (services(5)).  If
     you specify the file, mcastread will write the data to the file.

     With -v, mcastread generates more messages.

     With -4 and -6, you can use either IPv4 or IPv6.  By default, mcastread
     uses IPv6.

     With -s source option, you can also specify the sender address of the
     multicast packet.  If your kernel supports IGMPv3 / MLDv2, this source
     information is passed to the upstream multicast router.

RETURN VALUES
     mcastread will exit with positive value on errors.

SEE ALSO
     mcastsend(1)

HISTORY
     The mcastread command first appeared in WIDE/KAME IPv6 protocol stack
     kit.

KAME                             May 11, 1999                             KAME