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- 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 IP network interface 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 a mismatch between MAC address and IP address. Refer to the AWS documentation and AWS Networking and Charon-SSP (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 names section in AWS Networking and Charon-SSP.
- The NetworkManager is disabled on Charon-SSP AWS. Therefore, ifcfg-files in /etc/sysconfig/network-scripts are required to define the IP configuration of an interface.
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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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Assigning an Elastic IP Address to the Network Interface
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