You need more aggregate throughput for Cloud VPN between your on-premises site and GCP than a single tunnel provides. What should you do?
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Correct answer: Add a second on-premises VPN gateway with a different public IP address. Create a second tunnel on the existing Cloud VPN gateway that forwards the same IP range, but points at the new on-premises gateway IP..
Why this is the answer
The correct approach to increase aggregate throughput for Cloud VPN is to add a second on-premises VPN gateway with a different public IP address and create a second tunnel from the existing Cloud VPN gateway to this new on-premises gateway. This creates a redundant path, allowing traffic to be load-balanced across both tunnels, effectively increasing throughput. Doubling the MTU is not a standard or supported method for increasing VPN throughput and can lead to fragmentation issues. Creating two tunnels on the same Cloud VPN gateway to the same destination IP address does not provide additional throughput; it's redundant and doesn't leverage multiple paths. Adding a second Cloud VPN gateway in a different region would provide redundancy for disaster recovery but wouldn't increase aggregate throughput for traffic between the existing on-premises site and the existing GCP region.
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