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# 1.2.1.9 Dynamic DNS Module

The Dynamic DNS Client module provides a method for updating a dynamic IP address to a public DDNS service. These services can be used to provide DNS hostname mapping to devices that behind routers, firewalls, and/or on networks that dynamically assign IP addresses.

Note that this only solves one of the two problems for communicating to devices on local subnets from the Internet. While Dynamic DNS can help to locate the device, the router or firewall it sits behind must still properly forward the incoming connection request. This generally requires port forwarding to be configured for the router behind which the device is located.

The Dynamic DNS client supports the popular interface used by No-IP (noip.com) and DNS-O-Matic (dnsomatic.com).

Note: The dynamic DNS services stipulate that updates should be made no more frequently than 10 minutes, and only when the IP address has changed. Updates made more often than that are considered abusive, and may eventually cause your account to be disabled. Production devices that get rebooted frequently may need to store the last known IP in non-volatile memory. You also should not enable this module while testing the rest of your application.