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並前往https://learningnetwork.cisco.com/s/question/0D53i00000Kt3qQCAR/firewall-rules-for-icmp-tcpudp-port-7

Firewall rules for ICMP (TCP/UDP port 7)

But can someon explain why specifically TCP/UDP port 7. What exactly is the firewall rule? ICMP has no ports and is neither TCP nor UDP. ICMP is ...

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