i am deploying two vm firewall in different AZ of same VPC
I will configure VPN attachment with firewall for east west and outbound traffic to be scanned by firewall.
My concern is for the return traffic of east west from the vm firewall.
The outbound traffic will pass with vpn attachment but how the return traffic will flow?
You have two options. You can either use BGP to prepend the routes from one of the firewalls to create essentially an Active/Passive routing hierarchy or use SNAT. The former is generally preferred. We have this documented in our AWS Reference Architecture here.
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