On Thu, Jan 09, 2003 at 09:32:53AM +0200, Matthew Fincham wrote:
> I have a situation which I am sure has an explanation. I find I can ping an
> Internet address, but a traceroute to the same address fails. When I run
> traceroute using ICMP instead of UDP packets, the traceroute is successful.

Sounds like the destination host is just filtering out UDP packets
(for security reasons, perhaps).