Eng - repeat two hundred times - I Must Not Confuse ICMP Echo Packets With TCP Packets On Port 80.
Then repeat two thousand times - Not All Hosts On The Internet Implement RFC 1122 Correctly.
Quote:
RFC 1122, page 42:
Every host MUST implement an ICMP Echo server function that receives Echo Requests and sends corresponding Echo Replies.
A host SHOULD also implement an application-layer interface for sending an Echo Request and receiving an Echo Reply, for diagnostic purposes.
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