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Effective DevOps with AWS - Second Edition by Nathaniel Felsen, Giuseppe Borgese, Yogesh Raheja

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VPC Flow Logs

An intrusion detection system (IDS) and an intrusion prevention system (IPS) are common tools in a secure network. In an on-premise environment, they are not so easy or cheap to implement, because you need dedicated hardware, and also a network structure that accommodates this feature. By contrast, in AWS, using only one feature of the VPC service, you can enable and disable these tools whenever and wherever you consider appropriateYou can have these tools at three levels of your network: 

  • The VPC level  
  • The subnet level
  • The elastic network interface (ENI) level

As you know, a network interface belongs to one subnet, and one subnet belongs to a VPC. So, if you enable tools at the subnet level, you don't have to apply them ...

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