Is the ICMP protocol generally used in real world networking configurations ?
- If yes, what are some real world examples that make use of this protocol.
In addition, I see that the ICMP echo requests (type 0 / 8) are a must filter within an organization be it small or large, and the main reason is to avoid foot printing of the network by potential malicious persons.
- In reality does this must be mandatory for a network and does it happen ? I see large sites as google, yahoo and other sites not blocking ICMP echo messages.