DynHOST from OVH are very useful if you have a dynamic IP and want to have a DNS entry always pointing at it. I use a little script called addns.pl to update the DNS record with my home server external IP. It is a perl script and a configuration file. Once you have installed the script on your machine and have given it permission to execute, you need to create a configuration file. The configuration file must be placed at /etc/addns.conf. The configuration file for addns should be formatted like so:
{
server_host = www.ovh.com
update_host = bonaert.eu
detect_method = "webcheck"
ip_detect_host = "checkip.dyndns.org"
ip_detect_port = 80
username = "dynDNS username"
password = "dynDNS password"
}
Once your script is installed and your configuration file is created, ensure that this script is executed regularly by the cron. Voila the job is done.