DSM-7.2-Router

Welcome to the DSM-7.2-Router README guide! This document provides detailed instructions on how to configure your Synology DiskStation running DSM 7.2 to act as a router. It includes guidance on installing and enabling the DHCP Server, setting up NAT, and configuring port forwarding using iptables.

Prerequisites

Before you start, ensure you have:

• A Synology NAS running DSM 7.2.
• Administrative access to the DSM interface.
• SSH access to your NAS.

Step 1: Installing the DHCP Server Package

DHCP Server functionality in DSM 7.2 is not built-in and must be installed manually:

Installation Instructions

1. Log into DSM:

   • Open your browser and enter the IP address of your NAS to access the DSM interface.

2. Open Package Center:

   • Go to the main menu and click on Package Center.

3. Search for DHCP Package:

   • Type "DHCP" in the search bar and press enter.
   • Find the DHCP Server package in the search results.

4. Install the DHCP Server:

   • Click on the Install button next to the DHCP Server package.
   • Follow the on-screen prompts to complete the installation.

Step 2: Configuring DHCP Server

Once installed, you can configure the DHCP server to handle IP distribution:

Configuration Steps

1. Access DHCP Server Settings:

   • Navigate to DHCP Server from the main menu.

2. Enable and Configure DHCP:

   • Enable the DHCP Server by checking the appropriate box.
   • Configure your IP range, subnet mask, gateway, and other network settings.

Step 3: Setting Up NAT

Use the nat.sh script to set up Network Address Translation (NAT) on your NAS,Save nat.sh in your preferred path, in the example here it is saved in the homes folder.

Setup NAT Script in Task Scheduler

sh /volume1/homes/nat.sh restart

Step 4: Enabling Port Forwarding

Port forwarding allows you to direct internet traffic to specific devices on your network. This example shows how to expose the 192.168.10.10 transmission torrent port to the outside world.

Port Forward Script in Task Scheduler

iptables -t nat -F DEFAULT_PREROUTING
iptables -t nat -A PREROUTING -p tcp --dport 51415 -j DNAT --to-destination 192.168.10.10:51415
iptables -t nat -A PREROUTING -p udp --dport 51415 -j DNAT --to-destination 192.168.10.10:51415

Disclaimer

Please be cautious when modifying network settings; incorrect settings can disrupt connectivity. Always back up your configurations and data.