> One guess might be that many firewalls do not allow the use of UDP
> packets that many version of traceroute use by default.
I believe that "traceroute" on a un*x/linux etc system uses UDP at
port ranges around 33400, while "tracert" on a Windoze system
uses ICMP, as default behavior.
Just tried this using RH9. Default is UDP. Adding the "I" (uppercase
I as in India) uses ICMP instead. The replies are always ICMP TTL
exceeded. Bob
> Try traceroute -I foo.com instead to force the use of ICMP messages.
>
>
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