end-to-end path. Each step through the tracert process does nothing more then issue an icmp echo request, measuring the response time and displaying it.

maybe on windows it does icmp echo but no unix does this (at least not by default). i recommend you study what unix traceroute actually does. :)

I'm very heavy (professionally) into protocol analysis, and yes unix does rely on icmp to perform the traceroute. (icmp pkt type 11, code 0)

If you're a non-believer, put an access list on all icmp traffic and see if your traceroute continues to function. :)

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