Just as a heads-up, this is going to be a quick reference guide for the use of the ICMP echo request - or better known as PING. I have to look up some options multiple times a week, so I thought it is beneficial to write it up in a post like this. I might add more options at some point, but those are the most important ones in my experience. In a nutshell: ICMP echo requests can be used to check the reachability of two hosts on layer 3. This is indispensable in any troubleshooting session if ...