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Configuring DDNS

Overview

Although DNS allows you to access nodes in networks using their domain names, it provides only the

static mappings between domain names and IP addresses. When you use the domain name to access

a node whose IP address has changed, your access fails because DNS leads you to the IP address that

is no longer where the node resides.

Dynamic Domain Name System (DDNS) can dynamically update the mappings between domain names

and IP addresses for DNS servers to direct you to the latest IP address corresponding to a domain name.

DDNS can only dynamically update the mappings between domain names and IPv4 addresses but not

IPv6 addresses.

Figure 205 DDNS networking application

As shown in Figure 205, DDNS works on the client-server model comprising the DDNS client and the

DDNS server.

• DDNS client—A device that needs to update the mapping between the domain name and the IP

address dynamically on a DNS server. An Internet user usually uses the domain name to access an

application layer server such as an HTTP and FTP server. When its IP address changes, the

application layer server runs as a DDNS client that sends a request to the DDNS server for updating

the mapping between the domain name and the IP address.

• DDNS server—Informs the DNS server of latest mappings. When receiving the mapping update

request from a DDNS client, the DDNS server tells the DNS server to re-map between the domain

name and IP address of the DDNS client. Therefore, the Internet users can use the same domain

name to access the DDNS client even if the IP address of the DDNS client has changed.

The DDNS update process does not have a unified standard and depends on the DDNS server that the

DDNS client contacts. The well-known DDNS service providers include www.3322.org, www.oray.cn

(also known as the PeanutHull server), and www.dyndns.com.

The device can act as a DDNS client to dynamically update the latest mapping between its domain name

and IP address on the DNS server through a DDNS server at www.3322.org or www.oray.cn for

example.

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