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+# ndnping and ndnpingserver
+
+## Introduction
+
+**ndnping** and **ndnpingserver** are reachability testing tools for
+[Named Data Networking](http://named-data.net). They test the reachability between two nodes. The
+client sends an Interest intended for a node running **ndnpingserver**. The ping server then sends
+Data in response. The client then calculates the roundtrip time for the Interest-Data exchange, or
+marks it as a timeout if the Data is not received within the timeout period.
+
+## Using the Client
+
+The client can be invoked by calling **ndnping** with a name to ping. For example, to ping
+`ndn:/edu/arizona`, one would execute::
+
+    ndnping ndn:/edu/arizona
+
+There are also a variety of options to control the behavior of the ping client. For example, to
+send only four pings to `ndn:/edu/arizona`, displaying a timestamp with each received Data or
+timeout, type::
+
+    ndnping -c 4 -t ndn:/edu/arizona
+
+A list of the available options can be found with `man ndnping`.
+
+## Using the Server
+
+The server can be invoked by calling **ndnpingserver** with a name to listen for pings to. For
+example, to listen for pings to `ndn:/edu/arizona`, one would execute::
+
+    ndnpingserver ndn:/edu/arizona
+
+There are also a variety of options to control the behavior of the ping server. For example, to
+satisfy only 4 ping requests before exiting, execute the following::
+
+    ndnpingserver -p 4 ndn:/edu/arizona
+
+A list of the available options can be found with `man ndnpingserver`.
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