failing traceroutes with unix

Unix Traceroute uses a set of UDP ports starting at 33434 (33434 to 33534) the reply can be desination unreachable. There can be an issue were they trace fails on certain packets because the target system has some program listening on one of the UDP ports in queston, you see this with the Nth trace packet always failing. Some systems let you override the UDP range. The specific issue occured when 1 packet failed on a trace route to a system on the same subnet, 1000s of pings worked without a problem. So use ICMP ping if you can, if UDP traceroutes fail at the last hop for no reason, this can be considered