There are two different ways to respond when Tailscale is unavailable: reconnect the tailnet when a device joins Wi-Fi, or prevent ordinary internet traffic from falling back to the local connection if an exit-node path fails. A Wi-Fi automation can attempt reconnection; it does not, by itself, block traffic after a later disconnect. For a documented fail-closed setup, Tailscale’s managed ExitNodeID system policy requires an exit node and intentionally leaves clients without internet if that node is unreachable.
Choose the behavior you actually need
A Tailscale exit node routes a device’s non-Tailscale internet traffic through a selected device in the tailnet. It is not the same thing as simply reconnecting the Tailscale client. Each client must opt in to an exit node, and tailnet access policy may also need to authorize internet routing.
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| Approach | Trigger and scope | What happens on failure |
|---|---|---|
| Wi-Fi-triggered reconnection | A device joins a named Wi-Fi network; useful for an individual iPhone or iPad. | Attempts to start or restore Tailscale. It does not establish that arbitrary later disconnects will block direct internet traffic. |
| Required exit node | A managed client is governed by the ExitNodeID system policy. |
Fails closed: when the required node is unavailable, ordinary internet connectivity is lost until it returns. |
| Router-level Tailscale | A compatible router routes traffic for devices behind it through a configured exit node. | Depends on the model, firmware, and routing configuration. Do not assume a separate VPN kill switch protects against a Tailscale drop. |
Choose fail-closed behavior when avoiding direct WAN fallback matters more than keeping internet access during an exit-node outage. If uninterrupted connectivity matters more, a reconnect attempt or a deliberate fallback may be preferable, but it is not equivalent to a strict no-leak policy.
Require an exit node on managed clients
For supported, organization-managed clients, Tailscale documents the ExitNodeID system policy as the direct way to require exit-node use. Tailscale’s system-policy documentation states: “The ExitNodeID policy forces the Tailscale client to always use the given exit node.” The policy accepts an exit-node device ID or auto:any. Deployment details and supported platform/version history are platform-specific, so consult the [system-policy documentation] for the relevant client.
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This is intentionally restrictive. Tailscale says clients lose internet connectivity if the forced exit node—or all nodes suggested by auto:any—goes offline. A node may also be unreachable when a device is behind a captive portal or cannot reach Tailscale coordination services. This approach is for administrators who accept downtime rather than permit ordinary internet traffic to use a direct local WAN connection.
A user selecting an exit node on one device does not automatically select it on every device. The standard setup requires each client to opt in, and an ACL or grant may need to permit access to autogroup:internet. See Tailscale’s [exit-node overview] and [exit-node setup guide] for the client and policy steps.
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Reconnect when an iPhone or iPad joins Wi-Fi
Tailscale’s Shortcuts integration supports Tailscale 1.36 or later and iOS 15 or later; the integration generally also supports macOS Monterey 12 or later. On iPhone or iPad, create a personal automation triggered by joining a selected Wi-Fi network, then add Tailscale’s Connect action. Tailscale’s [Shortcuts guide] walks through the setup; it was last validated January 5, 2026.
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- Create the trigger: In Shortcuts, open Automation and create a personal automation for a Wi-Fi network you trust or routinely use.
- Add the action: Select Tailscale’s Connect action, then review the automation’s run and confirmation settings in Shortcuts.
- Test the expected result: Join that network and check that Tailscale connects. The integration can also report connection state and exit-node use, and provides Use Exit Node and Stop Using Exit Node actions.
This automation responds to joining the selected network. It is a reconnection aid, not a general firewall rule: it does not prove that traffic is blocked if Tailscale disconnects later while the phone remains on Wi-Fi.
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Configure and verify exit-node routing
On a client where exit-node use is permitted, select the intended exit node in Tailscale’s client settings and separately decide whether to allow local network access. Tailscale’s setup guide explains the platform-specific steps. After connecting, verify routing by checking whether a public-IP lookup reports the exit node’s public IP, as described in the official [setup guide].
Decide whether local devices should remain reachable
Local-network access is a separate choice from routing internet traffic through an exit node. Allowing it can preserve access to devices such as printers or a NAS on the current LAN; disabling it changes what remains reachable locally. Choose based on whether local access is necessary, rather than treating it as part of the exit-node selection itself.
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Account for exit-node availability by platform
An exit node is useful only while it can forward traffic. Tailscale documents that macOS exit nodes use userspace routing and must remain awake for continued availability; Windows exit nodes also have userspace and sleep-related caveats. On Linux, firewall configuration can affect forwarding. Check Tailscale’s [exit-node documentation] for the platform-specific limitations before relying on a node for continuous access.
There is also a related, narrower fail-close behavior for connector routes: when a connector key expires, advertised routes remain configured but become unreachable, avoiding fallback to an untrusted network. Administrators can weigh availability by disabling key expiry or configuring high availability. This connector-route behavior should not be treated as proof that every client blocks traffic for every kind of tailnet disconnection; see the same [Tailscale documentation] for the scope of that behavior.
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Consider a router for several devices
A router configured as a Tailscale client can route traffic for multiple devices through a custom exit node. GL.iNet’s official [Tailscale router guide] documents custom-exit-node configuration and names the GL-MT3000; it also describes a GL-BE9300 acting as an exit node. This can centralize routing, but the routing path and failure behavior still depend on the exact model and configuration.
Do not equate this with GL.iNet’s separate VPN Kill Switch feature. Its [VPN Kill Switch documentation] describes blocking traffic when a VPN tunnel fails, with options that vary by firmware; it does not establish protection when a Tailscale connection drops. Before relying on a router for fail-closed behavior, verify the exact model, firmware, routing mode, and observed behavior during the failure you need to handle.
Keep the client running when no one is logged in
Automatic reconnection also depends on whether Tailscale is running in the needed session. Tailscale runs as a system daemon by default on Linux, runs within a user login session on macOS, and supports unattended mode on Windows. If your use case requires a client to stay available across sign-out or restart, check the platform-specific [unattended-running guide], last validated September 25, 2026. This is a service-lifecycle consideration, not a substitute for requiring an exit node.
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Match the control to the failure you want to prevent
- Reconnect when joining a familiar iPhone or iPad network: use the Shortcuts Wi-Fi automation and Tailscale Connect action.
- Prevent managed clients from falling back to direct internet: deploy
ExitNodeIDon supported clients and accept that an unavailable exit node means no ordinary internet. - Route multiple devices together: consider router-level Tailscale only after checking model- and firmware-specific behavior during an actual Tailscale outage.
- Preserve local printers or NAS access: make an explicit local-network-access choice when configuring the exit node.
Tailscale’s configuration documentation does not publish a measured reconnection time, leak-reduction rate, or security-outcome figure for these setups. Treat the decision as a choice of trigger, scope, and failure behavior—not as a quantified guarantee.
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