Synology VPN Tunnel Configuration Guide for Secure Access
How to Configure a Secure VPN Tunnel on Synology NAS
Secure remote access is essential for businesses that operate across multiple offices, remote teams, or hybrid work environments. A VPN tunnel allows organizations to create encrypted connections between networks or devices, ensuring that sensitive data travels safely across the internet.
Synology NAS systems include built-in VPN capabilities through VPN Server, allowing administrators to configure secure tunnels that connect remote users, branch offices, or entire networks. By properly configuring VPN tunnels, businesses can protect internal resources and maintain secure access to files, applications, and servers.
What Is a VPN Tunnel?
A VPN tunnel is an encrypted communication channel established between two endpoints. The tunnel protects network traffic from interception by encrypting data before it is transmitted over public networks.
VPN tunnels are commonly used for:
Remote employee access to internal resources
Secure communication between branch offices
Protecting sensitive business data during transmission
Accessing internal services from outside the corporate network
With a VPN tunnel, remote users can connect to the internal network as if they were physically present in the office.
VPN Protocols Supported by Synology
Synology NAS devices support several VPN protocols through the VPN Server package. Each protocol offers different security levels and compatibility options.
OpenVPN
OpenVPN is one of the most secure and widely used VPN protocols. It uses strong encryption and is supported across many operating systems.
OpenVPN is recommended for most business deployments because it provides reliable security and flexible configuration.
L2TP/IPsec
L2TP combined with IPsec encryption provides secure VPN connections and is built into many operating systems. It is often used for mobile devices and basic remote access environments.
PPTP (Legacy)
PPTP is an older protocol and is generally not recommended for modern deployments due to weaker security standards.
Organizations should typically deploy OpenVPN or L2TP/IPsec for secure business environments.
Preparing the Synology NAS for VPN Deployment
Before configuring a VPN tunnel, administrators should ensure the NAS is properly prepared.
First, install the VPN Server package from Synology Package Center. This application enables VPN functionality directly on the NAS.
Next, confirm that the NAS has a static IP address or domain name, which allows remote users to locate the VPN server reliably.
Firewall rules and router settings must also allow VPN traffic to reach the NAS.
Configuring the VPN Tunnel
Once the system is prepared, administrators can configure the VPN tunnel through the Synology DSM interface.
Install VPN Server
Open Synology Package Center and install the VPN Server application. Once installed, the service will appear in the DSM control panel.
Enable a VPN Protocol
Inside the VPN Server interface, administrators can enable OpenVPN or L2TP/IPsec depending on the organization’s requirements.
Configuration options include encryption settings, port numbers, and user authentication.
Configure User Permissions
Administrators should define which users are allowed to connect through the VPN. This is managed through the VPN Server permissions panel.
It is recommended to restrict access only to authorized users to maintain security.
Configure Router Port Forwarding
For external access, the router must forward the required VPN ports to the Synology NAS.
Common ports include:
OpenVPN: UDP 1194
L2TP/IPsec: UDP 500, 1701, and 4500
Correct port configuration ensures that remote users can establish VPN connections successfully.
Testing the VPN Connection
After configuration is complete, administrators should test the VPN connection from an external network.
Users install the appropriate VPN client, enter the NAS address, and authenticate with their credentials. If configured correctly, the VPN tunnel will establish a secure connection to the internal network.
Testing helps confirm that firewall rules, authentication settings, and network routes are functioning correctly.
Security Best Practices for VPN Deployment
A VPN provides strong protection, but proper configuration is necessary to maintain security.
Organizations should enforce strong authentication policies, including multi-factor authentication where possible. Encryption settings should use modern standards, and unused VPN protocols should be disabled.
Regular monitoring of connection logs can help detect suspicious activity and prevent unauthorized access attempts.
Combining VPN access with other security controls such as firewalls and network segmentation further strengthens the security posture.
Synology NAS as a Secure Remote Access Platform
Synology NAS systems provide more than just storage. They can act as secure access gateways that allow remote employees and branch offices to connect to internal systems.
When combined with tools such as Synology Drive, file services, and backup platforms, VPN tunnels create a secure environment where users can access company resources without exposing internal networks to public threats.
About Epis Technology
Epis Technology assists organizations in designing secure remote access infrastructures using Synology NAS platforms. The company specializes in configuring VPN solutions, secure storage systems, and enterprise data protection environments that protect business-critical data.
Their services include Synology deployment, network security configuration, backup strategy planning, and hybrid cloud integration. By implementing secure VPN architectures, Epis Technology helps organizations provide safe remote access while maintaining strong cybersecurity standards.