Cisco Tutorial - Blocking ICMP PING REQUEST ON CISCO ROUTER (NETWORK SECURITY)

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Although most network administrators do a fairly good job of filtering TCP and UDP traffic, many forget to filter ICMP traffic. ICMP traffic is necessary for troubleshooting TCP/IP and for managing its flow and proper function. However, ICMP is also dangerous. Hackers can use it to map and attack networks, so it needs to be restricted.

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