While migrating in phases over Cloud VPN, how should you assign IP ranges in GCP to ensure on-prem systems remain reachable?
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Correct answer: Use an IP range on Google Cloud that does not overlap with the range you use on-premises.
Why this is the answer
When migrating in phases over Cloud VPN, it's crucial to use non-overlapping IP ranges between your on-premises network and Google Cloud. This prevents IP address conflicts and ensures proper routing. If IP ranges overlap, routers won't know whether to send traffic to the on-premises network or the Google Cloud network, leading to connectivity issues. Using the same IP range, even for a primary range, will cause conflicts. While secondary ranges can be useful, they must also be non-overlapping to maintain network integrity. Therefore, a completely distinct IP range in GCP is the only way to guarantee seamless communication during a phased migration.
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