Everyone that signs up especialy those on braodband connections can get a free Ip redirection account from
http://www.dyndns.org/ who offer static and dynamic DNS services (static is prefered of course)or
http://www.no-ip.com who only offer dynamic DNS for free even those on dail up can update thier IPs with these services and then update their waste DNS to resolve to the dynamic IP.you set this up in preferances /IP Adresses and then check force incoming IP to the redirction name you choose after you have done this edit the key you posted and add the DNS ,this will also help in keeping the network more stable and up 24/7