A good guide for DDNS and more
This is much easier to understand, read full text at:
http://advancedhomeserver.com/dynamic-dns-ddns-and-a-little-more/
So what’s DDNS?
DDNS is a technique that keeps on top of the IP address your ISP
assigned to you. Periodically, and fairly often, a program runs to find
out what your ISP provided internet IP address is
at this moment.
Then a private company somewhere on the internet is contacted and
associates your current IP address with an internet name you provided to
them. The internet name is a composite of a name you chose and their
actual domain name. When someone on the internet enters that name in a
browser, they’re talking to you.
For example, Asus offers a free DDNS service for buyers of some of
the products they sell. I own an Asus router and use their DDNS service.
Within the router, I turned the DDNS feature on and entered a name.
Asus agreed the name was unique and established the link within a couple
of seconds. The router relays my current IP address to Asus DNS servers
several times a day. I now have an accessible internet presence at
________.asuscomm.com.
Behind the scene, the internet DNS service sees the ‘
asuscomm.com’ part of the name and routes the search to the Asus DNS servers. Asus finishes the job and matches
________.asuscomm.com to whatever my ISP has decided my IP address should be at that moment. From this, the internet knows where to find me.
