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Welcome once again to Implementing Microsoft Windows Always

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On VPN, and in this module we're going to talk about high

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availability. Up until now,

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our infrastructure consists of a single VPN server and a

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single NPS server, and while fully functional,

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it obviously has some single points of failure. In the event that an

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NPS server or a VPN server is offline for any reason,

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whether that's a planned outage to apply system updates or an

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unplanned outage because of some sort of failure,

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the entire solution becomes unavailable and will incur a service outage.

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So to eliminate single points of failure, we'll add VPN

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and NPS servers to provide redundancy.

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This ensures that any time a single server is unavailable for any reason,

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either that a planned outage or an unplanned outage,

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the service remains viable and users will still be able to

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access on‑premises resources remotely.

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In addition to redundancy,

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administrators may also deploy additional VPN servers, NPS

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servers, or commonly both, to provide enough capacity to

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meet expected requirements.

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A virtual machine provisioned with 4 CPU cores and 8 GB of RAM will usually

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support in the neighborhood of about 1,500 concurrent sessions.

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Your mileage may vary of course,

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but that's a good starting point or a good estimate.

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If you plan to, say, support 10,000 concurrent sessions, then you're clearly

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going to need additional capacity to meet those needs.

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So, in this module, we'll explore the process of adding additional NPS

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servers and VPN servers to provide high availability, redundancy, and to meet capacity requirements for our larger deployments.