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Man Pages
MCASTSEND(1) FreeBSD General Commands Manual MCASTSEND(1)

mcastsend
send multicast packets

mcastsend [
-l hop_limit
] [
-i interface
] [
-s scope
] [
-h
] address port [
file
]

The mcastsend utility reads the given file (or the standard input if no file is specified) and sending them to the multicast address you specified. Also you must specify UDP port number or service name as seen on services(5).
The options are as follows:
hop_limit
Specify the number of hop limit. By default, it depends on the system default value.
interface
Specify the interface name to use sending packets. By default, kernel will decide.
scope
(IPv6 only) Specify the hint in order to decision of source IP address to send packets. By default, global scope is applied. If you don't specify interface, mcastsend ignores this option. scope takes one of the following numeric:
1 node local
 
2 link local
 
5 site local
 
14 global
 
Show this help message.

mcastsend will exit with positive value on errors.

mcastread(1), sysctl(8)

The mcastsend command first appeared in WIDE/KAME IPv6 protocol stack kit.
July 29, 1999 KAME

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