1. installa ddclient
2. sudo dpkg-reconfigure ddclient
3. x namecheap dynamicdns.park-your-domain.com
4. protocollo scegli qualunque poi correggi in /etc/ddclient protcol=namecheap
5. utente e password, FQDN octosrv.me
6. ???
7. Profit

http://www.creang.com/howtoforge/howto_set_up_automatic_dynamic_dns_update_using_ddclient/