We have three VPC and Transit Gateway along with Gateway Load Balancer deployed. Two VM series deployed in two AZs and We have test VPC that spans in three AZs Gateway Both FW registered in Target Group of Load Balancer using IP address. When FW are deployed interface swap is not used. Routes are configured as network diagram.
I can ping from test vpc1 to test vpc2 and vice versa when both FW are up and running, BUT when I do failover test by shutting down one of the FW, some test VPC cannot ping to other Test VPC like if I ping from test VPC1 to two VMs on other Test VPC running on two different AZz, one connection drops during when shutting down one FW, i.e. Gateway Load Balancer is not transferring connection other FW which is running, so have following questions:
When deploying FW behind Gateway Load Balancer in AWS, is it mandatory to swap-interface during boot-strap ?
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