Networking 101: Understanding (and Using) ICMP

“As Networking 101 begins moving on up the stack toward the
layers involved with routing, we must pause for a moment. Some
attention needs to be paid to the most misunderstood protocol:
ICMP. Managers and administrators alike should understand what ICMP
is really used for if they plan on making firewall policy
decisions, and administrators can use ICMP knowledge to fully
understand routing issues.”

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