Therefore, it??™s not possible to expect that the IP address you give to your friends and
family for your webcam to be useful tomorrow, next week, or next month.
To ensure that you have a consistent method to access services on your home network
from across the Internet, you have two choices. The first is to change your cable or
DSL service from a subscriber level with basic dynamic IP addressing to a premium and
more expensive account with static IP addresses. The second is to sign up for a service
that will automatically translate your dynamic IP address into a frequently updated
fully qualified domain hostname??”a domain name you register or a generic one.
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158 Project 23
Some of the most popular dynamic DNS services are No-IP from No-IP.com
(www.no-ip.com), DynDNS (www.dyndns.com) from Dynamic Network Services,
and DNS2Go (http://dns2go.com) from Deerfield.com. If you choose a free service,
you get to pick a catchy hostname (nothing obvious like www) coupled with a choice
of one of their top-level domain names. So, for example, you could end up with evilpcgenius.
no-ip.org to point to your home server. If you choose a paid service level,
you could actually use a ???nice??? URL, like www.evilpcgenius.org.
The key to making this translation is a piece of software you run on one of your
computers that checks for your current cable or DSL IP address and then sends that
address to the dynamic IP provider??™s DNS servers and associates it with your hostname.
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