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Chapter 14 – Dynamic DNS Client

Command Line Interface and Application Examples for Multi-Tech Systems, Inc. IP Modules (S000368F) 143

Prerequisites

Mandatory Prerequisites: The following details are mandatory configurations and have to be validated before

starting DDNS client:

• Set the ddns username.

# set ip ddns user <username>

• Set the ddns password.

# set ip ddns password <password>

• Set the ddns domainname.

# set ip ddns domain <domain>

Optional Parameters:

• Set the ddns system

# set ip ddns system <custom/dynamic>

• Set the ddns server name

# set ip ddns server <server>

• Set the interval after which forced updating has to be done

# set ip ddns update-interval <update-interval>

• Set the maximum retries if updating fails

# set ip ddns max-retries <max-retries>

• Set the port for the checkip server

# set ip ddns checkip-port <port>

• Set the checkip server

# set ip ddns checkip-server <server>

Scenario 1 – Running the DDNS Client

This scenario describes how to run the DDNS Client and the various conditions under which the update of IP address

will be done on the DDNS server.

Description The DDNS client is enabled using the command set ip ddns enable.

After issuing a Save, DDNS client starts.

The DDNS client updates the ip-address in the DDNS server upon any of the following

conditions:

• When the IP module is rebooted, the ip-address acquired is updated in the DDNS

server.

• When there is no ip-address change for the update-interval time, the existing ip-

address is updated in the server to “touch” the domain records in the server without

expiring (this is needed when using free DDNS service).

• When there’s a fresh PPP link established and the ip-address acquired is different

from the already existing ip-address in the server, the ip-address is updated.

Configuration

1. Mandatory configuration.

Command

Result Responses Check in the dyndns.org server if the ip-address is updated.

Notes

• At any point in time, if the PPP link is not up and the DDNS client needs to contact the server, then it can

implicitly establish the PPP link and bring it down once the updating is over.

• If the DDNS client is unable to reach the DDNS server or unable to update in the DDNS server even after

maximum retries, then it tries to reach the server again in 24-hour intervals.

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