How to Use a UGREEN 2.5Gbps Ethernet Adapter with a NAS Device

Find the driver for your NAS on the Synology website: https://kb.synology.com/en-global/DSM/tutorial/What_kind_of_CPU_does_my_NAS_have

Find the corresponding driver for your UGREEN 2.5Gbps adapter here: https://github.com/bb-qq/r8152/releases/tag/2.20.1-1

    Note: The driver will depend on the DSM version.

Go to the NAS unit's Package Center, and install the driver.

Click Agree on the prompt about the package being supplied by third-party developers. 

You may see an error indicating a driver installation failure. Just click Comfirm and Finish.

Go to the Control Panel, and find the Terminal & SNMP. Let's fix this issue on installing this driver.

Tick the checkbox for Enable SSH service. 

Download PuTTy here, and connect to this software. This IP address shall be the one that you are now connecting to your NAS, the one you assigned to the NAS.

Establish the Connection:

Login: Name that would allow you to connect to the NAS.

Password: The actual password will NOT be displayed here, once you finished typing your password to this NAS, click ENTER on your keyboard.

Gain the "ROOT" authority by using "sudo -i", and you will have to input the password once again.

Type the command:  sudo install -m 4755 -o root -D /var/packages/r8152/target/r8152/spk_su /opt/sbin/spk_su

Please take extra cautious that there is a space between the "spk_su" and "/opt/sbin/spk_su". If you got any questions, please let me know.

Once there is no extra information could be found on this PuTTY software, disconnect this software.

Install this driver again, you shall be able to get the LAN 3 visiable.