Contents

Introduction· 1

Prerequisites· 1

Software versions used· 1

Network configuration· 1

Restrictions and guidelines· 2

Procedures· 2

Configuring DDNS· 2

Verifying the configuration· 3

Introduction

The following information provides examples for configuration DDNS at the CLI.

Prerequisites

This document is not restricted to specific software or hardware versions. Procedures and information in the examples might be slightly different depending on the software or hardware version of the device.

The configuration examples were created and verified in a lab environment, and all the devices were started with the factory default configuration. When you are working on a live network, make sure you understand the potential impact of every command on your network.

The following information is provided based on the assumption that you have basic knowledge of DDNS.

Software versions used

This configuration example was created and verified on R6749P14 of the H3C MSR3610-X1 router.

Network configuration

As shown in Figure 1, the router is a Web server with domain name whatever.3322.org and uses an IP address dynamically obtained through DHCP. To make sure the router can always provide Web services 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 1 Network diagram

Restrictions and guidelines

·     Make sure the router obtains a public IP address through DHCP.

·     Before you configure DDNS on the router, register an account and password on the DDNS server (a DDNS service provider), for example, PeanutHull. This example uses domain name whatever.3322.org, account name steven, and account password nevets. Apply an account as required.

Procedures

Configuring DDNS

# 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 the interface will be dynamically updated.

[Router] interface gigabitethernet 1/0/1

[Router-GigabitEthernet1/0/1] ddns apply policy 3322.org fqdn whatever.3322.org

Verifying the configuration

Verify that the router can update its domain name-IP mapping through the DDNS provider www.3322.org when its IP address changes. The Internet users can resolve the correct IP address through the domain name whatever.3322.org to access the Web service.