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nano /etc/init.d/noip-update.sh

noip-update.sh

#!/bin/sh
#
# Purpose :
#     This script updates the no-ip alias.
#     The specifications of the noip update
#     protocol can be found at :
#     http://www.no-ip.com/integrate/
#
# Author :
#     Raphael Jolivet
#
# Last update:
#     14-05-2005
# Misc params (Set it to what you need)
LOGIN=XXXXXXXXXXXXX            # NoIp login
PASS=XXXXXXXXXXXX # NoIp pass
HOST=XXXX1,XXXX2,XXXX3     # The sites to be updated
LOGFILE=/var/logs/noip.txt  # The log file
# Log the date
echo ""                            > $LOGFILE
echo "Updating no-ip DNS entry"    >> $LOGFILE
echo "------------------------"    >> $LOGFILE
date >> $LOGFILE
# Call No-ip Update system
result=`curl -s "http://dynupdate.no-ip.com/dns?username=$LOGIN&password=$PASS&hostname=$HOST" 2>&1`
# Log the result
echo "Result from no-ip: $result" >> $LOGFILE

chmod +x /etc/init.d/noip-update.sh

crontab -e

03 */12 * * * /etc/init.d/noip-update.sh