icmp_message sends and receives custom messages through the ICMP protocol.

For more details, please see https://lgiki.net/post/icmp_message/.

Before using icmp_message, it is necessary to disable the Linux kernel's automatic response to ICMP Echo requests:

# echo "1" > /proc/sys/net/ipv4/icmp_echo_ignore_all

The usage of icmp_message is very simple:

# icmp_message host

Assuming there are two computers, A and B, with IP addresses 192.168.1.1 and 192.168.1.2 respectively. To exchange messages using the ICMP protocol between A and B, you can execute the command icmp_message 192.168.1.2 on A and icmp_message 192.168.1.1on B.

MIT License.