Most of the time when I've seen this, it has to do with a router not liking to have multiple outstanding ICMP echo requests. It sounds like maybe you have a router that doesn't like quite as many outstanding requests as you have there. The number of outstanding requests can change based on the latency of your hops - timeouts can cause more to be outstanding.<br><br>To test this theory, go to the faq and follow the directions to make Ping Plotter single threaded (it's currently the last entry in the FAQ). This will affect performance, but you can tweak things so it's not *too* bad.<br><br><A HREF="http://www.pingplotter.com/faq.html" target="_new">http://www.pingplotter.com/faq.html</A><br><br>Another possibility is that you have a router that drops timed out echo requests when under load. I have a Cisco 675 here that had this problem - under heavy load, all the intermediate hops would go to 100% packet loss, and even under moderate load, the latencies would jump up to something about 10 times the normal latency. To fix this, I updated to a new version of the bios (CBOS 2.4.x if you have a 675).<br><br>After you've tested this out, check back in here and let us know how it turns out.<br><br>Thanks!<br><br><br>