From: "Geo" 

"John Beckett"  wrote
in message news:8dbec2h1p34lv26g9qk37b4hgj6kqu017t{at}4ax.com...


> Windows TRACERT sends ICMP Echo Request packets. The host should
> reply with 'ICMP Echo Reply'. As UDP is commonly filtered, while ICMP
> is not, using ICMP should work most of the time, when UDP might fail.

Actually windows uses a 92 byte icmp packet that is exactly the same length
as one of the worms used to spread so lots of routers are still configured
to block 92 byte icmp..

Geo.

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