many providers also host "Looking glasess". Its a server hanging off their core network that allows you to run pings and traceroutes http://lookingglass.level3

many providers also host "Looking glasess". Its a server hanging off their core network that allows you to run pings and traceroutes http://lookingglass.level3.net/ http://lookingglass.level3.net/ (seems to be down currently) a nice big list of looking glasses http://www.lookinglass.org/ http://www.lookinglass.org/