1- download ez-ipupdate.xxx.rpm (i use the rpm of mandrake)
2-rpm -ivh ez-ipupdate.xxx.rpm
3-now, in /usr/share/doc you have some templates of ez-ipupdate.conf
4-
service-type=hn
user=(user-hn : password)
interface=ppp0
host=(host.hn.org)
5-ez-ipupdate -c path/ez-ipupdate.conf
6-the end

PD: sorry, but my english is so bad, if you speak spanish, better:)
PD2: you can hosting a dot com or other international domain name

PD3:http://www.netvoluton.com.ar (hosting on E-smith V5 whit HN.ORG and EZ-IPUPDATE.
bye