To gain a deeper insight into the network flows and performance, you can use a combination of CloudWatch and VPC Flow Logs. While VPC Flow Logs give us a very fine-grained overview of a particular packet flow for a particular ENI, it would be difficult to get any kind of tangible information on the large-scale aspect of the state and performance of our network from VPC Flow Logs. For this purpose, we will be using the CloudWatch interface.
In the following example, we can use the CloudWatch environment to display network interface statistics for each EC2 instance in our environment. As you can see, we have two instances for which we are displaying network performance information.
In the CloudWatch interface shown in the following screenshot, we select only the network metrics and we are able to see the performance for each instance:
Sometimes, our...