mcfirst(1) 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 waited.


The options are as follows.
Force IPv4
Force IPv6
Print version
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.


Please report them to Stig Venaas <[email protected]>, the author of this tool.


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