This guide explains how to access a Synology NAS connected to the Internet with a dynamic IP address via a domain name.

Prerequisites

• Have a Synology NAS connected to the Internet with a dynamic IP address.
• A dynamic DNS must have been created on the relevant domain.

Linking a Synology NAS to a domain name

1. Add Infomaniak as a service provider

1. Open the Synology management interface (DSM).
2. Go to the Control Panel.
3. Click on External Access (under the Connectivity section).
4. Click on the Customize button (under the DDNS tab):
   

• Service Provider: Infomaniak
• Query URL : https://infomaniak.com/nic/update?hostname=__HOSTNAME__&myip=__MYIP__
• Click on Save.

2. Add the dynamic DNS to Synology

Now that Infomaniak has been added as a service provider:

1. Open the Synology management interface (DSM).
2. Go to the Control Panel.
3. Click on External Access (under the Connectivity section).
4. Click on the Add button:
   
   
    

• Service provider : Infomaniak (the profile created in the previous step)
• Hostname : the URL configured in the Manager when adding the Dynamic DNS
• Username : the identifier set in the Manager during the addition of the Dynamic DNS
• Password : the password set in the Manager when adding the Dynamic DNS

From this point on, the dynamic IP address of your Synology NAS will be automatically synchronized with your domain name.

3. NAT configuration for Synology DDNS

To make your NAS accessible from the outside, you need to configure its NAT. By default, Synology NAS uses ports 5000 and 5001.

You can access your NAS using the following syntax: http://your-domain:5000 or https://your-domain:5001.

Refer to the official documentation for more information.

4. Configuration of a “Reverse Proxy”

If you do not want to specify the ports :5000 or :5001 in your URLs, it is possible to configure a Reverse Proxy from your Synology NAS, and thus redirect the URLs to port 443 for port 5001 and port 80 for port 5000 (official Synology documentation for this configuration).