Ddclient
From WikiPaul - Paul Swanson's wiki
/etc/ddclient.conf
# /etc/ddclient.conf pid=/var/run/ddclient.pid protocol=dyndns2 use=web server=members.dyndns.org login=UserName password='thepassword!' yourdomain.adyndnsserver.com
sudo crontab -e
0 18 * * * /usr/sbin/ddclient
sudo vim /etc/rc.local
/usr/sbin/ddclient
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