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+Planetlab Ping-of-Death (POD)
+-----------------------------
+The Planetlab POD is a Linux kernel patch that creates the feature
+of resetting and rebooting a computer when a particularily
+formatted ICMP "ping" commmand is received.
+
+A PlanetLab node's kernel gets a host, mask and hash value through
+sysctl's that are performed on the node.  The node then looks
+for an ICMP packet from a host matching the host/mask and, if the
+packet payload is the hash value, the node forces an immediate
+reboot.
+
+From a controlling host's side, one invokes commands on the
+remote node to set the host, mask and hash values and remembering
+the hash value.  When the rebooting of a remote node is required,
+the remembered hash value is looked up and sent to the node
+in a specially constructed ICMP packet.
+
+This POD system uses the same packet definition as EMULAB and uses
+the some code from EMULAB to generate and transmit the packet.
+No reason to invent something new.
+
+The remote execution (ssh commands) are all done as "idsl1".
+
+Contolling host tools:
+pl-podset:  set the host and hash on a remote node
+        Call: pl-podset hostIP maskIP targetName
+        Uses ssh to call 'pl-podcntl' on the remote node to
+        set the host and hash in that node.  Also saves the
+        information into the file './HashFile'.
+pl-podzap: send ICMP packet to node to resetit
+        Call: pl-podzap targetName
+        Fetches parameters from the file './HashFile' and
+        calls 'pl-poddoit' on the 'hostIP' machine to send the 
+        reset ICMP packet to the specified target node.
+        Note that this relies on the planetlab node that
+        was specified in the 'pl-podset' command to actually
+        do the packet transmission.
+pl-poddoit: send the ICMP packet (called by 'pl-podzap')
+        Routine that constructs an ICMP packet of the proper
+        format and send it to the node.
+
+Planetlab node scripts:
+pl-podcntl: set the host and hash into the kernel
+        Call: pl-podcntl hostIP maskIP hashValue
+        Sets the specified values into the kernel and enables
+        the POD filtering operation.
+
+EXAMPLE
+-------
+Setting a node to be able to reset (assuming running on 123.123.12.23):
+    pl-podset 123.123.12.23 255.255.255.255 planetlab-1.stanford.edu
+
+To later reset the node (command performed on 123.123.12.23):
+    pl-podzap planetlab-1.stanford.edu