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There is no documented, one-size-fits-all recipe for combining a Tailscale exit node, WireGuard, and Linux network namespaces into a selective-routing setup. The safe approach is to decide which traffic belongs in each path, then design and test the routes, namespace boundaries, permissions, DNS, and failure behavior for your particular system. A Tailscale exit node normally routes a device’s non-Tailscale internet traffic through the selected tailnet device; that is not the same as an integrated per-process WireGuard split tunnel.
What traffic do you want to route selectively?
Write down the traffic classes before configuring anything. For example, you might want tailnet destinations to use Tailscale, a chosen application or destination set to use WireGuard, and everything else to remain on the ordinary network. Those are separate routing goals; do not assume that choosing a Tailscale exit node automatically creates the WireGuard path or selects applications for it.
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- Tailnet traffic: connections to devices and routes within your Tailscale network.
- Exit-node traffic: internet-bound traffic from a client that you choose to send through a Tailscale exit node.
- WireGuard traffic: traffic assigned to the WireGuard interface or routing domain by your Linux configuration.
- Ordinary-network traffic: traffic that should use the host’s normal network connection rather than either tunnel.
Be specific about whether “selected” means destinations, IP ranges, processes, users, or an entire namespace. Those choices determine where the route policy must live.
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Tailscale exit-node selection, Linux route tables, network namespace placement, and tailnet access policy are related but distinct controls. Routes select where packets go; ACLs or grants decide whether a connection is allowed. Both the route and the applicable permission must allow a connection for it to work, as Tailscale explains in its route-injection reference.
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| Mechanism | Documented scope | Where the decision is made | What it does not establish |
|---|---|---|---|
| Tailscale exit node | Routes a client device’s non-Tailscale internet traffic through a selected tailnet device by default. | Exit-node advertisement and approval, client selection, and tailnet policy. | A per-process Linux WireGuard split tunnel. |
| Tailscale subnet router or app connector | Provides routes to selected network destinations or application destinations, respectively. | Tailscale route configuration and policy. | An integrated namespace-and-WireGuard arrangement. |
| WireGuard with Linux network namespaces | Can separate routing state and interfaces; WireGuard documents namespace-based routing designs. | Linux interface placement, namespace routing, and the operator’s network configuration. | A ready-made Tailscale configuration or proof that a specific combined topology will work. |
Tailscale’s exit-node documentation describes default routing behavior and separately discusses subnet routers, app connectors, and local-network access. It also identifies app-based split tunneling on Android; it does not document an equivalent integrated per-application Linux control for this combined setup. See Tailscale’s exit-node overview.
What must be configured to use a Tailscale exit node?
On Linux, the exit-node host must be configured to advertise itself, have IP forwarding enabled for IPv4 and IPv6, and be approved by an administrator in the Tailscale admin console. The client then selects that exit node separately. Tailscale’s Linux setup documentation gives the command tailscale set --advertise-exit-node; follow its current instructions for the rest of the host and admin-console setup: Set up an exit node on Linux.
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- Enable forwarding on the intended Linux exit-node host. Tailscale’s setup requires IPv4 and IPv6 forwarding. The exact persistent setting depends on the Linux distribution and host configuration.
- Advertise the exit-node capability. On that host, use the documented command
tailscale set --advertise-exit-node. - Approve it in the admin console. Advertising the capability does not itself mean clients can use it; an administrator must approve the exit node.
- Check tailnet policy. A customized policy may need a grant or ACL permitting
autogroup:internet. Permission to connect to the exit-node device itself is not the same as permission to route internet traffic through it. - Select the exit node on the client. This is a separate client-side choice. Tailscale documents that local-network access is disabled by default while using an exit node and provides an option to enable it.
The exit node’s default behavior is broad: it routes non-Tailscale traffic through the selected device, apart from traffic already directed to a subnet router or app connector. If your goal is to send only particular applications through a tunnel, do not treat exit-node selection as that application-level policy.
What do WireGuard and namespaces contribute?
Linux network namespaces provide separate network stacks and routing tables, among other isolated resources. WireGuard’s project documentation states, “Like all Linux network interfaces, WireGuard integrates into the network namespace infrastructure.” Its example describes placing a physical interface in a physical namespace while leaving the WireGuard interface in the initial namespace to route internet traffic through WireGuard. That illustrates what the components can do; it is not a Tailscale setup recipe. See WireGuard’s Routing & Network Namespaces documentation and the Linux network_namespaces(7) reference.
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A namespace can isolate processes and routes, but it does not decide by itself how packets should pass among Tailscale, WireGuard, and the host. Before implementing a combined topology, establish which namespace owns each interface, which routing table each traffic class consults, and how any required forwarding between namespaces is configured. The correct arrangement depends on the target system and cannot be inferred merely from the fact that both Tailscale and WireGuard use Linux networking.
How should you choose where split-routing policy lives?
Choose the mechanism that matches the unit of traffic you want to select. These are different designs, not interchangeable recipes:
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- All internet traffic from a tailnet client: use the documented Tailscale exit-node model, accepting its default non-Tailscale traffic scope unless you have separately designed and validated additional routing.
- Selected network destinations: consider Tailscale subnet routing or app connectors where their documented destination-based behavior fits. These are distinct from per-process WireGuard routing.
- Traffic isolated by process or network stack: a namespace-based WireGuard design may be appropriate, but you must define interface ownership, routes, forwarding, DNS, and firewall behavior for your own topology.
- More than one tunnel in the same host design: document route precedence and policy ownership explicitly. The
wg-quickmanual describes policy-routing facilities, includingTable,PostUp, andPreDown; their availability does not prove that a particular configuration will coexist safely with Tailscale. Consult thewg-quick(8)manual.
Before applying configuration, make a route plan that identifies, for every traffic class, its originating process or namespace, destination scope, intended interface or tunnel, DNS resolver, and allowed fallback. Do not copy a topology from a different distribution or firewall setup without checking how its routes and packet filtering interact with yours.
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Verify each traffic class independently on the target host. Tailscale recommends checking the public IP to confirm exit-node routing; that check only establishes the observed egress for the test you ran, not that every application, address family, or failure case follows the intended path.
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- Inspect the relevant namespace’s interfaces and routing tables to confirm that the intended routes exist in the place where the traffic originates.
- Test a destination that should use the Tailscale exit node and check its externally visible public IP.
- Test a destination or process assigned to WireGuard separately; verify its route and observed egress rather than inferring success from an active interface.
- Test traffic meant to remain on the ordinary network and confirm it does not enter either tunnel.
- Check DNS resolution from each relevant namespace or process context. A correct IP route does not by itself prove that DNS queries use the intended resolver or path.
- Test IPv4 and IPv6 separately. The Linux exit-node setup calls for forwarding both address families, and one family can behave differently from the other.
- Test local-LAN access explicitly if it is required, because it is disabled by default while a Tailscale exit node is in use unless enabled.
Also test failure behavior before relying on the arrangement: bring down each tunnel or endpoint in a controlled environment and observe whether affected traffic stops, falls back to the ordinary network, or becomes unreachable. Decide whether fallback is acceptable for each traffic class. The referenced documentation does not establish the fallback behavior of an arbitrary combined topology.
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