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)