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diff --git a/source4/scripting/python/samba_external/dnspython/examples/ddns.py b/source4/scripting/python/samba_external/dnspython/examples/ddns.py
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+++ b/source4/scripting/python/samba_external/dnspython/examples/ddns.py
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+#!/usr/bin/env python
+
+#
+# Use a TSIG-signed DDNS update to update our hostname-to-address
+# mapping.
+#
+# usage: ddns.py <ip-address>
+#
+# On linux systems, you can automatically update your DNS any time an
+# interface comes up by adding an ifup-local script that invokes this
+# python code.
+#
+# E.g. on my systems I have this
+#
+#	#!/bin/sh
+#
+#	DEVICE=$1
+#
+#	if [ "X${DEVICE}" == "Xeth0" ]; then
+#        	IPADDR=`LANG= LC_ALL= ifconfig ${DEVICE} | grep 'inet addr' |
+#                	awk -F: '{ print $2 } ' | awk '{ print $1 }'`
+#		/usr/local/sbin/ddns.py $IPADDR
+#	fi
+#
+# in /etc/ifup-local.
+#
+
+import sys
+
+import dns.update
+import dns.query
+import dns.tsigkeyring
+
+#
+# Replace the keyname and secret with appropriate values for your
+# configuration.
+#
+keyring = dns.tsigkeyring.from_text({
+    'keyname.' : 'NjHwPsMKjdN++dOfE5iAiQ=='
+    })
+
+#
+# Replace "example." with your domain, and "host" with your hostname.
+#
+update = dns.update.Update('example.', keyring=keyring)
+update.replace('host', 300, 'A', sys.argv[1])
+
+#
+# Replace "10.0.0.1" with the IP address of your master server.
+#
+response = dns.query.tcp(update, '10.0.0.1', timeout=10)