How to enable Enhanced Networking Adapter (ENA) on Windows
Most times when you increase or change the instance type of a server on AWS, the Network adapter changes and this can cause system related issues
Here are steps for installing the ENA Driver:
- Install the driver for the operating system from this link. http://docs.aws.amazon.com/AWSEC2/latest/WindowsGuide/enhanced-networking-ena.html
Locate the Operating system relevant to you. This can be selected by clicking on the relevant operating system as shown below.
- Moreover, Copy this to the browser of the Instance where you wish to install the Network Adapter into. This will automatically download the zip file containing the ENA network adapter
- Nonetheless, Open the command prompt (CLI) and navigate to the folder containing the path and run the command below.
pnputil -i -aena.infThe output will be as follow below
Output success would be
Microsoft PnP Utility
Processing inf : ena.inf
Succesfully installed the driver on a device on the system.
Driver package added successfully.
Published name : oem9.inf
Total attempted: 1
Number successfully imported: 1
- Next stop the instance (server) by shutting it down
- Furthermore, Enable ENA support on the instance.
- Run this command below
Note: (This step has to be done from your local computer) and NOT on on the instance itself). - Open the command prompt (CLI) on you local machine (work station) and type in aws configure
- Now follow the prompt (instruction) by entering your keys and region where the instance is located.
Modifying the instance Attribute (AWS-CLI)
- Run this command below
aws ec2 modify-instance-attribute --instance-id Replacethiswith theinstance_id --ena-supportHowever, The next step would be to describe the instance to ensure the ENA (Enhanced Networking Adapter) is installed.
aws ec2 describe-instances --instance-ids Replacethiswith theinstance_id --query "Reservations[].Instances[].EnaSupport"
Note: At the moment the the download and installer steps have changed by AWS but the syntax still remains the same
– Now you have to download, navigate to the folder and run the install.ps1.
All other steps and syntaxes are valid
If you encounter problems when you restart the instance, then you will have to disable ENA support using one of the following commands: And this has to be done from your local workstation and not on the server.
Modify-instance-attribute(AWS CLI)
– aws ec2 modify-instance-attribute –instance-id instance_id –no-ena-support
https://docs.aws.amazon.com/AWSEC2/latest/WindowsGuide/enhanced-networking-ena.html