Why firewalls does not allow ICMP echo request packets. Why are pings not allowed to certain systems?
Well it just depends on your security policies. ICMP will imply that a system exists (although can be spoofed by honeypots etc.) Personally I don't like permitting ICMP in general. If you have no business connecting to a web service on a given machine, what right would you have to know if that machine can be pinged?
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