4. Security Group - AWS - Private

Fill out the form and click “Create.” This will allow other EC2 instances in the AWS - Private Subnet to ping each other if they are reachable.

ICMP is widely used in network diagnostic tools:

  • Ping: Uses ICMP Echo Request and Echo Reply messages to test connectivity.
  • Traceroute: Uses ICMP to trace the path a packet takes to its destination.

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