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Decide whether to enable split tunnel and what the risks are.

Full tunnel sends all traffic over the VPN, including Netflix. Split tunnel sends only corporate subnets through the tunnel. Split is faster and saves concentrator bandwidth, but your security controls (DNS filter, content filter) lose sight of the rest.

Try this first

  1. 1Inventory which security controls sit on the tunnel exit: web filter, DLP, IPS. If they exist, keep full tunnel or buy a separate SWG.
  2. 2For split tunnel, enforce secure DNS on the client (Cloudflare Gateway, NextDNS, Umbrella), otherwise you lose visibility on malware domain lookups.
  3. 3Exclude Teams and Microsoft 365 from the tunnel explicitly, that is Microsoft's own guidance (Teams media direct to internet performs better).
  4. 4Document which subnets go over the tunnel, otherwise no one will remember in a year.

When to bring us in

You have an audit requirement that all traffic be inspected: pick a SASE or SSE solution (Cloudflare, Zscaler, Netskope) so you can split-tunnel with cloud inspection.

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