ICR-1601
112
2.8
DNS & DDNS
How does user access your server if your WAN IP address changes all the time? One way is to register
a new domain name, and maintain your own DNS server. Another simpler way is to apply a domain name
to a third-party DDNS service provider. The service can be free or charged. If you want to understand the
basic concepts of DNS and Dynamic DNS, you can refer to Wikipedia website
1
.
2.8.1
DNS & DDNS Configuration
Dynamic DNS
To host your server on a changing IP address,
you have to use dynamic domain name service
(DDNS). Therefore, anyone wishing to reach
your host only needs to know the domain
name. Dynamic DNS will map the name of your
host to your current IP address, which changes
each time you connect your Internet service
provider.
The Dynamic DNS service allows the gateway
to alias a public dynamic IP address to a static
domain name, allowing the gateway to be
more easily accessed from various locations on
the Internet. As shown in the diagram, user
registered a domain name to a third-party
DDNS service provider (NO-IP) to use DDNS
function. Once the IP address of designated
WAN interface has changed, the dynamic DNS
agent in the gateway will inform the DDNS
server with the new IP address. The server
automatically re-maps your domain name with
the changed IP address. So, other hosts or
remote users in the Internet world are able to
link to your gateway by using your domain
name regardless of the changing global IP
address.
1
http://en.wikipedia.org/wiki/Domain_Name_System