Not too sure if this falls into NANOG or not but I thought I'd give it a shot. I'm seeing some wierd responses from the Sprintlink primary name server (ns1.sprintlink.com) and I wanted to know if anyone could explain the behavior. Pinging 204.117.214.10 from San Francisco CA (GTE & Pacbell) and our colo in Bay City MI (MCI), I get a standard response. However, if I ping from our colo in Cambridge MA (GTE), I get a response of "2 times amplification" instead of packet loss. I've certainly seen amplification from ping in the past, but I thought it was a host/interface configuration issue that would affect all external hosts equally. I did not believe it had anything to do with routing, but now I'm not so sure. Anyone have any clues on why this is happening? Can anyone explain why ICMP amplification would occur? Aaron Tavistock Network Engineer / UNIX Systems Administrator Total Entertainment Network (http://www.ten.net)