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0024-egress-traffic-inspection.md

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24. Egress Traffic Inspection

Date: 2023-03-30

Status

✅ Accepted

Context

The Modernisation Platform needs to balance the inspection of egress traffic with the preservation of separation between live and non_live. This requirement has come as a prerequisite to allowing HTTP traffic to leave the Modernisation Platform towards the internet.

Decision

We will maintain two separate egress VPCs for live and non_live environments.

We will use AWS Network Firewall to apply FQDN-based inspection to traffic destined for HTTP endpoints.

We will use in-line inspection%20AWS%C2%A0Network%C2%A0Firewall%20deployed%20to%20protect%20traffic%20between%20a%20workload%20private%20subnet%20and%20NAT%20gateway) in our egress VPCs.

Consequences

  • Update diagrams showing flow of traffic out of Modernisation Platform to internet
  • Raise tickets to cover scope of work.