One Doorway for Internal Traffic When every internal app has its own side door, nobody can watch them all. The gateway pattern puts one auditable doorway in front of everything.

No. A VPN puts a device on the network; a gateway checks each request to each app. Many setups use both, and the guide maps where each fits.

It can, which is why the failure-modes section covers redundancy and fail-safe defaults before anything goes to production.

The comparisons cover common open-source and hosted options by team size and needs. The pattern matters more than the brand.