Add a UDP Listener

Use this guide to add a new UDP listener to an existing Network Load Balancer (NLB).

Steps to Add a New UDP Listener

1. Access the Load Balancer Homepage: Go to https://hcm-3.console.vngcloud.vn/vserver/load-balancer/vlb.

2. Select Your Load Balancer: Click on the Load Balancer where you want to add the new listener.

3. Go to the Listener Tab: In the Load Balancer details page, select the "Listener" tab.

4. Click "Add New Listener": A pop-up window will appear, allowing you to configure the listener's information.

5. Configure Listener Settings:

   • Listener Name: Note that the listener name cannot be changed after creation.

   • Protocol & Port: Select the UDP protocol and choose a port (the default is port 53, and it will increment if lower ports are already in use).

   • Default Pool and Action: In cases where requests to the Load Balancer don't match any specific pool, the NLB will redirect that traffic to the default pool.

   • Advanced Configuration: Refer to the guides below for advanced configuration options:

     • Configuring Timeouts

     • Configuring IP Whitelists for Load Balancers

Important Note: You can only select a Pool with the UDP protocol as the default pool for a UDP Listener.

Additional Notes

• Listener Names: Choose descriptive names for your listeners to easily identify their purpose.

• Port Selection: If you're using the default port 53 (commonly used for DNS), ensure no other services are running on that port within your VPC.

• Default Pool: The default pool acts as a fallback for requests that don't match any specific routing rules.

• Advanced Configurations: Explore timeout and IP whitelisting options to fine-tune your listener's behavior.