EX-9632R-H/EX-9633R-H
Manual
EX-9632R-H/EX-9633R-H • Manual Version 1.1 • 30.06.2012
www.topsccc.com
Appendix A
DDNS
“Dynamic DNS or DDNS is a method of updating, in real time, a Domain Name System
(DNS) to point to a changing IP address on the Internet. This is used to provide a persistent
domain name for a resource that may change location on the network.” -- wiki
3 components needed to make the DDNS mechanism functional.
(A) A DDNS server
(B) A device requires DDNS service
(C) A device which wants to connect (B)
The reason why DDNS is needed is because (B) may change its IP address randomly or
periodically, and/or actively or passively. When this happens, (C) is not possible to connect to
(B) via IP address because it is not aware of the changes except that (B) tells (C) exceptively and
which can’t always possible. To solve this problem, (A) stands between (B) and (C). Firstly, (B)
have to register itself to (A) with expected domain name (e.g. mr521.gotdns.com). Every time
(B) changes its IP address, it has to tell (A) about new IP. Later on, if (C) wants to connect to (B),
it has to use the domain name, except the IP address. The domain name resolving request (i.e.
transfer domain name to IP address) from (C) will first sent to (A) and it will return with current
(B)’s IP. Then, (C) can connect to (B) with no problem.
So, the 1
st
step to setup DDNS is to find public or private DDNS server. Here, we use
14-days trial version service provided by
DynDNS
as an example.
1.
Connect to DynDNS home page,
http://dyn.com/welcome-to-the-new-dyn-com/
, and
select “Free Trial of DynDNS Pro” on left bottom.
