new file mode 100644
--- /dev/null
+++ b/plugins/ping.js
@@ -0,0 +1,51 @@
+'use strict';
+
+/**
+  Copyright (c) 2012, Sonny Piers <sonny at fastmail dot net>
+
+  Permission to use, copy, modify, and/or distribute this software for any
+  purpose with or without fee is hereby granted, provided that the above
+  copyright notice and this permission notice appear in all copies.
+
+  THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+*/
+
+/*
+References:
+  http://xmpp.org/extensions/xep-0199.html
+*/
+
+Lightstring.plugins['ping'] = {
+  namespaces: {
+    ping: 'urn:xmpp:ping'
+  },
+  stanzas: {
+    ping: function (aTo){
+      return(
+        "<iq to='" + aTo + "' type='get'>" +
+          "<ping xmlns='" + Lightstring.ns.ping + "'/>" +
+        "</iq>"
+      );
+    },
+    pong: function (aTo){
+      return "<iq to='" + aTo + "' type='result'/>"
+    },
+  },
+  handlers: {
+    'iq': function (stanza) {
+      if (stanza.el.firstChild.localName !== 'ping')
+        return;
+
+      var id = stanza.el.getAttribute('id');
+      var from = stanza.el.getAttribute('from');
+      var stanza = Lightstring.stanzas.pong(from);
+      stanza.setAttribute('id', id);
+    }
+  }
+}