'How We Built a Solution That Improves Google Cloud Security by Leveraging Managed Instance Groups' by CheckPointSW checkpoint security
What are the important considerations and objectives for using MIGs with CloudGuard Network Security?
CloudGuard security gateways can automatically respond to health checks by the load balancer. This also allows CloudGuard security gateways to be used with internal as well as external load balancers. The health check confirms that the CloudGuard security gateway is functional and if not, the load balancer will not forward traffic to this specific instance. The security gateways start responding to health checks immediately after being automatically configured.
This allows the MIG to easily increase and decrease the number of members, and supports an auto-scaling solution for outbound/egress and East-West traffic protection.This architecture was not possible until recently because Google Cloud did not support specifying a specific interface when setting a MIG as an ILB backend pool. Internal and external load balancers could keep only the external interfaces as backend pool. This may lead to asymmetrical routing.
Of course, the security gateway will start to respond to the probe immediately only after being automatically configured.a few weeks ago. Symmetric hashing is used by internal load balancers so that “when packets belong to the same flow, Google Cloud calculates the same hash. In other words, the hash doesn’t change when the source IPLet’s see how this improves the automation and ease of use of Google Cloud traffic routing with CloudGuard.
The same gateway needs to inspect the returning traffic from Spoke2 to Spoke1. If another gateway inspects this traffic, it will possibly block this traffic . Before the release of symmetric hashing, to ensure that the traffic returning from Spoke2 to Spoke1 is routed to the same gateway, this gateway needed to use source network address translation on the traffic: in other words, assign its own IP instead of the source IP from Spoke1.
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