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Assessment Title
Rule Text
ICMP unreachable notifications, mask replies, and redirects must be disabled on all external interfaces.
Description
Discussion Text
The Internet Control Message Protocol (ICMP) supports IP traffic by relaying information about paths, routes, and network conditions. Routers automatically send ICMP messages under a wide variety of conditions. Three ICMP messages are commonly used by attackers for network mapping and diagnosis: Host unreachable, Redirect, and Mask Reply.
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