Add Static IP step

Author: cmilesb

content/operate/rc/databases/rdi/setup.md

@@ -125,8 +125,6 @@ To do this:
 
 In the [AWS Management Console](https://console.aws.amazon.com/), use the **Services** menu to locate and select **Database** > **Aurora and RDS**. [Create an RDS proxy](https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/rds-proxy-creating.html) that can access your database.
 
-<--! TODO: HOW TO GET THE STATIC IP -->
-
 #### Create network load balancer {#create-network-load-balancer-rds}
 
 In the [AWS Management Console](https://console.aws.amazon.com/), use the **Services** menu to locate and select **Compute** > **EC2**. [Create a network load balancer](https://docs.aws.amazon.com/elasticloadbalancing/latest/network/create-network-load-balancer.html#configure-load-balancer) with the following settings:
@@ -142,7 +140,12 @@ In the [AWS Management Console](https://console.aws.amazon.com/), use the **Serv
             - **Target type**: Select **IP Addresses**.
             - **Protocol : Port**: Select **TCP**, and then enter the port number where your database is exposed.
             - The **IP address type** and **VPC** should be selected already and match the VPC you selected earlier.
-        1. In **Register targets**, enter the static IP of your RDS proxy, enter the port, and select **Include as pending below**. Then, select **Create target group** to create your target group. Return **Listeners and routing** in the Network Load Balancer setup.
+        1. In **Register targets**, enter the static IP address of your RDS proxy, enter the port, and select **Include as pending below**. Then, select **Create target group** to create your target group. Return **Listeners and routing** in the Network Load Balancer setup.
+            To get the static IP address of your RDS Proxy, run the following command on an EC2 instance in the same VPC as the Proxy:
+            ```sh
+            $ nslookup <proxy-endpoint>
+            ```
+            Replace `<proxy-endpoint>` with the endpoint of your RDS proxy.
     1. Set the following **Listener** properties:
         - **Protocol**: Select **TCP**.
         - **Port**: Enter your source database's port.