29 January 2021

ICMP - Internet Control Message Protocol

https://stackoverflow.com/questions/21981796/cannot-ping-aws-ec2-instance

Add a new EC2 security group inbound rule:

  • Type: Custom ICMP rule
  • Protocol: Echo Request
  • Port: N/A
  • Source: your choice (I would select Anywhere to be able to ping from any machine)
The related ping utility is implemented using the ICMP echo request and echo reply messages. 
 
https://en.wikipedia.org/wiki/Internet_Control_Message_Protocol

Function: Send ICMP ECHO_REQUEST to network hosts
Syntax: ping [-aAbBdDfhLnOqrRUvV6] [-c count] [-F...

 


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