![]() ![]() As a result, the unavailability of the target computer cannot be inferred from an unanswered ICMP request. In practice, this doesn’t always work, as many administrators, for security reasons, configure the computers they manage in such a way that ICMP packets are rejected without a response. ![]() In theory and in accordance with the protocol specification, computers that support ICMP and/or ICMPv6 must automatically respond to incoming echo requests with an ICMP echo reply. For computer networks using IPv6, ICMPv6 has a successor protocol that can be used for this purpose. ICMP (Internet Control Message Protocol) is a protocol that enables the exchange of information and error notifications within IPv4 networks. In order to verify a computer’s availability, ping sends in its default setting four ICMP echo request packets of 32 bytes each to the address assigned as a parameter.
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