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Command etherecho broadcasts a message to all machines in the same network segment, and listens for other messages from other etherecho servers.

etherecho only works on Linux and BSD, and requires root permission or CAP_NET_ADMIN on Linux.


$ etherecho -h
Usage of etherecho:
  -i string
        network interface to use to send and receive messages
  -m string
        message to be sent (default: system's hostname)


Start an instance of etherecho on two machines on the same network segment:

foo $ etherecho -i eth0
bar $ etherecho -i eth0

Both machines should begin seeing messages from each other at regular intervals:

foo $ etherecho -i eth0
2017/06/14 00:03:13 [aa:aa:aa:aa:aa:aa] bar
2017/06/14 00:03:14 [aa:aa:aa:aa:aa:aa] bar
2017/06/14 00:03:15 [aa:aa:aa:aa:aa:aa] bar
bar $ etherecho -i eth0
2017/06/14 00:03:13 [bb:bb:bb:bb:bb:bb] foo
2017/06/14 00:03:14 [bb:bb:bb:bb:bb:bb] foo
2017/06/14 00:03:15 [bb:bb:bb:bb:bb:bb] foo

Additional machines can be added, so long as they reside on the same network segment.

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