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After creating a network interface, you have to assign it to the instance where it will be used.
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Important information:
- Stopping and restarting the instance after adding a second network interface will release any automatically assigned public IP address. If several interfaces are required where one or more are configured with a public address, use Elastic IP addresses.
- Additionally, adding a second network interface with an IP configuration to a non-Amazon Linux EC2 instance causes traffic flow issues. This occurs in cases of asymmetric routing where traffic to the instance arrives at one network interface and leaves the instance through the other network interface. This is blocked by AWS because of a mismatch between MAC address and IP address. Refer to the AWS documentation and the Charon-SSP Cloud Networking chapter (section asymmetric routing considerations) for more information. Failure to use the proper steps, may make your instance unreachable!
- If your instance supports enhanced networking there may be naming inconsistencies when adding additional interfaces to a running instance. Please refer to the interface naming section below and the AWS documentation.
- The NetworkManager is disabled on Charon-SSP AWS marketplace images. Therefore, ifcfg-files in /etc/sysconfig/network-scripts are required to define the IP configuration of an interface.
Basic steps:
| Step | Details | |
|---|---|---|
| Locate your network interface in the interface list and right-click on it. | The right-click opens the context menu. Select Attach. This will open the window to enter the necessary instance information. | |
| Select your instance and confirm entry. | Select your instance from the drop-down list and click on Attach. The state of your interface will change from available to in-use. | |
| Verify that your instance has a second interface. | Select your instance in the instance list. The networking tab in instance details should now display two network interfaces: | |
You You can also attach/detach existing interfaces from the instance overview screen. Select your instance and then Actions > Networking > Attach or Detach network interface.
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