How to determine what is using this AWS network interface?

user_230055 0
Viewed 5210

I am trying to determine what is using a network interface. It is not being used by any of the instances, NAT gateways, or elastic IPs that are in my account. It shows as

enter image description here

The instance section doesn't list the instance ID, but it does list an Instance Owner that is not my own account:

enter image description here

How can I find more details on what is using this network interface? I didn't see any other details when fetching info using an API call either. I wonder if perhaps this was used in the past by some account to which I had a peering connection, but when I checked just now there are no peering connections with the same owner as I see listed as Instance Owner for this network interface. It shows "in-use" so I want to know what is using it--how can I find that?

amazon-vpc amazon-web-services amazon-ec2
1 Answers

I found from this article that

Requester-managed: Indicates whether the network interface is managed by AWS.

A requester-managed network interface is a network interface that an AWS service creates in your VPC on your behalf. The network interface is associated with a resource for another service, such as a DB instance from Amazon RDS, a NAT gateway, or an interface VPC endpoint from AWS PrivateLink.

In my case it was showing true for Requester Managed, and the description listed an ARN. I could see that it was an ECS attachment ARN, so I was able to browse through the tasks in my ECS clusters (which run on AWS-managed Fargate) until I found one that matched the ENI.

user_2300550
Related