??Chatting using ICMP & LINUX

To send a custom message "hello" in hexadecimal format from an EC2 instance in AWS (running Linux) to a Red Hat Linux instance, you can use the `ping` command along with hexadecimal encoding and decoding utilities. Here's an example:

On the EC2 AWS Linux instance:

1. Convert the message "hello" to hexadecimal format. In Linux, you can use the `xxd` command for this:

echo -n "hello" | xxd -p        

The output will be the hexadecimal representation of "hello":

```

68656c6c6f

```

2. Use the `ping` command to send the message in hexadecimal format to the IP address or hostname of the Red Hat Linux instance:

ping -c 1 -p 68656c6c6f <Red_Hat_Linux_IP_or_hostname>        

Replace `<Red_Hat_Linux_IP_or_hostname>` with the IP address or hostname of the Red Hat Linux instance.

On the Red Hat Linux instance:

1. Capture ICMP traffic and decode the hexadecimal message using `tcpdump`

sudo tcpdump icmp -A        

When the EC2 AWS Linux instance sends the ping message, the Red Hat Linux instance should receive the ICMP echo request and display the decoded message "hello" in the terminal.

Please note that the command assumes the network interface on the Red Hat Linux instance is named `eth0`. If your network interface has a different name, adjust the command accordingly.

Additionally, make sure to set up the necessary network connectivity and security groups between the EC2 instances to allow ICMP traffic.

• Under the guidance of Vimal Daga LinuxWorld Informatics Pvt Ltd