App: Net Ping
Keep tabs on server performance with Net Ping, an ICMP ping utility. It offers statistics on round-trip response time for ping packets, whether packers are lost and why they may have been lost. Users can adjust packet count, ttl, interval and packet-size parameters. There's also a continuous ping mode, but it only works if the app is active--there's no background functionality, but it is a free app, after all.