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Originally Posted by BBKing
Then repeat two thousand times - Not All Hosts On The Internet Implement RFC 1122 Correctly.
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It's not so much that, it's that recent virus outbreaks e.g. the W32.Welchia.Worm, have used ICMP to check for potential hosts to infect, and because of the increased traffic many web hosters and service providers have either turned off ICMP or else drop the packets at any hint of any Denial of Service attacks.
Therefore traceroute and ping are just not reliable indicators of network connectivity.
So there's no substitute for looking at network traces to see exactly what's going on.
Some free tools are
www.ethereal.com or its relation
http://www.networkchemistry.com/products/packetyzer/