SYNOPSISmcfirst [ -46vr ] [ -I interface ] [ -c count ] [ -t time ] [ source ] group port
DESCRIPTIONmcfirst 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.
OPTIONSThe 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.
BUGSPlease report them to Stig Venaas <[email protected]>, the author of this tool.
HISTORYmcfirst was developed by Stig Venaas during the early days of the m6bone, the IPv6 multicast backbone.