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The Unofficial Ubuntu Starter Guide
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Q: How to assign Hostname to local machine with dynamic IP using free DynDNS service?

  1. Read General Notes
  2. Read How to add extra repositories?
  3. e.g. Assumed that internet connections have been configured properly
         Register free Dynamic DNS at https://www.dyndns.org
         Automatically refresh IP in DynDNS Database/DNS every hour
         * * * * * means minute hour date month year
  4. sudo apt-get install ipcheck
    sudo gedit /root/dyndns_update.sh
  5. Insert the following lines into the new file
    USERNAME=myusername
    PASSWORD=mypassword
    HOSTNAME=myhostname.dyndns.org
    
    cd /root/
    if [ -f /root/ipcheck.dat ]; then
      ipcheck -r checkip.dyndns.org:8245 $USERNAME $PASSWORD $HOSTNAME
    else
      ipcheck --makedat -r checkip.dyndns.org:8245 $USERNAME $PASSWORD $HOSTNAME
    fi
  6. Save the edited file (sample)
  7. sudo chmod 700 /root/dyndns_update.sh
    sudo sh /root/dyndns_update.sh
    export EDITOR=gedit && sudo crontab -e
  8. Append the following line at the end of file
    00 * * * * sudo sh /root/dyndns_update.sh
  9. Save the edited file
The Unofficial Ubuntu Starter Guide
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