DDNS configuration example with www.3322.org
Network requirements
As shown in Figure 47, the router is a Web server with the domain name whatever.3322.org and uses an IP address dynamically obtained through DHCP. To make sure the router can always provide Web services at whatever.3322.org when its IP address changes, perform the following tasks on the router:
Configure a DDNS policy to update the router's domain name-to-IP address mapping on the DDNS server. The DDNS server then updates the mapping on the DNS server.
Specify the IP address of the DNS server so that the router can access the DDNS server through domain name.
Figure 47: Network diagram
Configuration procedure
Before configuring DDNS on Router, perform the following tasks:
Register with username steven and password nevets at http://www.3322.org/.
Configure a DDNS policy to update the mapping between the router's FQDN and IP address.
Make sure the devices can reach each other.
# Create a DDNS policy named 3322.org, and enter its view.
<Router> system-view [Router] ddns policy 3322.org
# Specify the URL address, username, and password for DDNS update requests.
[Router-ddns-policy-3322.org] url http://members.3322.org/dyndns/update?system=dyndns&hostname=<h>&myip=<a> [Router-ddns-policy-3322.org] username steven [Router-ddns-policy-3322.org] password simple nevets
# Set the interval to 15 minutes for sending DDNS update requests.
[Router-ddns-policy-3322.org] interval 0 0 15 [Router-ddns-policy-3322.org] quit
# Specify the IP address of the DNS server as 1.1.1.1.
[Router] dns server 1.1.1.1
# Apply DDNS policy 3322.org to GigabitEthernet 1/0/1 to enable DDNS update. The mapping between domain name whatever.3322.org and the primary IP address of GigabitEthernet 1/0/1 will be dynamically updated.
[Router] interface gigabitethernet 1/0/1 [Router-GigabitEthernet1/0/1] ddns apply policy 3322.org fqdn whatever.3322.org