Is there a Ping library

My project uses UDP for communicating with other local devices. However, I sometimes need to access the Internet. I am using a Mega 2560 with a W5100 interface. I would like to ping a well known IP address periodically to see if I have an Internet connection. I found several references to libraries which have ping capability but I do not see anything in the Arduino reference. Where can I find a library with ping?

There is a least one Arduino Playground - ICMP Ping Library cannot comment on how well it works though.

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