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