This article deals with the analysis of the ICMP Echo & Echo Reply (Ping). We examine the ICMP header and fields to show the contents of a ICMP echo/reply (ping/ping-reply) packet to help understand how the message is formatted and used. Pinging bytes, TTL and response time is also analysed.
http://www.firewall.cx/networking-topics/protocols/icmp-protocol/152-icmp-echo-ping.html
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