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Tailscale not working with your VPN here’s how to fix it. Quick fact: VPN conflicts with Tailscale are common because both try to route traffic and manage network policies, which can lead to connectivity drops, DNS leaks, or split-tunnel confusion. This guide walks you through practical steps to diagnose, fix, and prevent issues when using Tailscale alongside your VPN. Below is a ready-to-follow plan you can use right away, plus handy tips and resources.
- Quick-start checklist
- Step-by-step troubleshooting
- Common pitfalls and how to avoid them
- Real-world examples and scenarios
- FAQ with practical answers
If you’re evaluating VPN options while running Tailscale, consider trying NordVPN for its broad server network and strong privacy features. For a seamless experience, you can explore the affiliate option linked in this guide: NordVPN.
Introduction: Quick, practical guide to get you back online
- Quick fact: The most frequent reason Tailscale stops working with a VPN is routing and DNS conflicts between the two services.
- In this guide, you’ll find a practical, step-by-step plan to diagnose and fix the problem, plus tips to keep both working smoothly.
- What you’ll get:
- A battle-tested checklist you can reuse anytime
- Clear explanations of why these steps matter
- Real-world scenarios so you can spot similar issues faster
- References to useful settings and data to inform your decisions
Useful resources and URLs text only:
Apple Website – apple.com
Google Public DNS – dns.google
Mozilla VPN support – support.mozilla.org
Tailscale DNS guide – tailscale.com/docs
NordVPN official site – nordvpn.com
: structured, SEO-friendly, and actionable
Understanding the conflict: VPNs, Tailscale, and how they route traffic
Tailscale creates a mesh network using WireGuard, routing traffic between devices with its own subnet routes. A traditional VPN tunnels all or part of your traffic through a VPN server, and often applies its own DNS and split-tunneling rules. When both are active,:
- Split-tunnel vs full-tunnel: If your VPN uses split-tunneling, some traffic goes through the VPN while other traffic uses your normal route. Tailscale may try to reach devices over its own paths, leading to inconsistent routing.
- DNS resolution: VPN DNS settings can override Tailscale’s DNS, causing hostnames to fail or resolve to wrong IPs.
- Allowed IPs and ACLs: Tailscale ACLs might conflict with VPN policies, blocking required routes.
- MTU and fragmentation: WireGuard uses a small MTU; misalignment with VPN MTU settings can cause packet loss.
Key data points you should know:
- Most users report issues arise when VPN DNS and split-tunnel rules override Tailscale’s DNS or peer discovery.
- Tailscale relies on multicast/broadcast discovery not always available behind certain VPNs.
- On Windows, VPNs that enforce strict firewall rules can block Tailscale’s peer connections.
Quick fix checklist start here
- Verify basic connectivity
- Check if the Tailscale service is running on all devices.
- Confirm you’re logged into the same Tailscale account and devices appear online.
- Test ping between devices by their Tailscale IPs not hostnames.
- Review VPN DNS settings
- Disable or override VPN DNS on affected devices and point to a stable DNS like 1.1.1.1 or 9.9.9.9 temporarily to test.
- Ensure DNS suffix search lists don’t override local Tailscale names.
- Adjust split-tunneling and firewall rules
- If your VPN uses split-tunnel, try forcing all traffic through VPN to isolate the problem, then revert.
- Temporarily disable firewall rules that block traffic to or from Tailscale interfaces ts0, tailscale0, etc..
- Confirm MTU compatibility
- Check MTU on both Tailscale and VPN interfaces. A typical safe MTU is 1280–1420 bytes for WireGuard under VPNs; adjust if you see fragmentation.
- Check ACLs and peer routes
- Review Tailscale ACLs to ensure your devices have permission to reach each other via the VPN path.
- Verify no conflicting routes exist in the VPN that would prevent Tailscale peer traffic.
- Reinstall or reset as a last resort
- Reinstall Tailscale on problematic devices.
- Reset VPN app settings to default to rule out stubborn misconfigurations.
Step-by-step: diagnosing and fixing common scenarios
Scenario A: DNS overrides break hostname resolution
- Step 1: Temporarily switch to a public DNS e.g., 1.1.1.1 on the affected device.
- Step 2: Clear DNS cache ipconfig /flushdns on Windows; sudo dscacheutil -flushcache; sudo killall -HUP mDNSResponder on macOS; sudo systemd-resolve –flush-caches on Linux.
- Step 3: Try reaching a Tailscale device by IP first, then by hostname.
- Step 4: If hostname works after changing DNS, pin DNS settings in VPN to a stable resolver or use Tailscale DNS MagicDNS properly configured.
Scenario B: Split-tunnel VPN blocks Tailscale traffic
- Step 1: In your VPN client, switch to full-tunnel all traffic through the VPN for testing.
- Step 2: If Tailscale devices can communicate, the issue is likely split-tunnel policy.
- Step 3: Implement a targeted split-tunnel rule: route only non-Tailscale outbound traffic through your VPN, while Tailscale traffic uses its own path. This minimizes conflicts.
- Step 4: Re-test with typical work scenarios and adjust as needed.
Scenario C: Firewall or security software blocks Tailscale
- Step 1: Temporarily disable third-party firewall or antivirus network protection.
- Step 2: Ensure ports used by Tailscale/WireGuard are allowed: usually UDP 3478 and other ephemeral ports for peer discovery.
- Step 3: Add Tailscale executables to allowed apps/permissions.
- Step 4: Re-enable protection and test connectivity.
Scenario D: VPN interferes with multicast/broadcast discovery
- Step 1: Confirm whether your VPN blocks multicast traffic.
- Step 2: Manual peer addition: connect to devices by IP instead of relying on multicast discovery.
- Step 3: If you rely on autodiscovery, consider temporarily disabling multicast requirements or using an alternative discovery mechanism if your VPN allows.
Scenario E: MTU mismatch causing packet loss
- Step 1: Check MTU on your primary network path and the Tailscale interface.
- Step 2: Increase or decrease MTU in small increments for example, from 1280 to 1300.
- Step 3: Re-test Tailscale connection and device reachability.
Best practices to prevent future conflicts
- Use a consistent naming and routing policy: keep Tailscale subnets and VPN subnets separate to reduce route collisions.
- Centralize DNS: decide if you want DNS managed by Tailscale MagicDNS or the VPN’s DNS. If both are used, ensure they don’t override each other accidentally.
- Document your ACLs and routing rules: a simple diagram of who can reach whom helps reduce misconfigurations.
- Regularly update both Tailscale and VPN clients: vendor updates often fix known compatibility issues.
- Favor per-device policies: especially on mobile devices where network environments change frequently.
Advanced tips: troubleshooting with logs and diagnostics
- Tailscale logs: On Windows, check the tailscale.exe and tailscaled service logs. On macOS/Linux, use tailscale bugs or journalctl -u tailscaled.
- VPN logs: Look for DNS override messages, MTU negotiations, and firewall rule hits during your test sessions.
- Use network analysis tools: traceroute, mtr, and wireshark can help identify routing vs DNS vs firewall problems.
- Snapshot your network: keep a simple table of which devices work under which configurations to quickly reproduce fixes.
Data-backed insights: what users typically experience
- A large share of users report that DNS configuration clashes are the primary culprits when Tailscale stops working with VPNs.
- In environments with strict corporate VPNs, full-tunnel setups reduce the number of moving parts, but you may lose direct peer discovery unless you configure explicit routes.
- On consumer VPNs with aggressive privacy features, disabling DNS leakage protections can resolve issues, but you must accept higher risk of leakage and ensure this aligns with your security posture.
Real-world scenario examples
- Example 1: A remote worker uses Windows with a corporate VPN and Tailscale. They disabled MagicDNS in Tailscale and pointed Windows DNS to the VPN DNS. After a restart, devices appeared online and could ping by IP, but hostnames failed until DNS was switched back.
- Example 2: A developer on macOS runs Linux servers with Tailscale behind an IPsec VPN. They found the VPN blocked UDP traffic to ports used by Tailscale, so they opened the necessary UDP ports and set MTU to 1420 to reduce fragmentation.
- Example 3: A gamer uses a home VPN and Tailscale on a gaming PC. They disabled split-tunneling, tested full-tunnel mode, and then gradually added selective routes so that game traffic bypassed the VPN while Tailscale remained connected.
Comparison: when to use Tailscale with VPN or vice versa
- Choose Tailscale for secure, identity-based device connectivity across multiple networks without needing complex VPN server management.
- Choose a VPN when you need geographical IP masking, access to regional content, or centralized encryption for all traffic.
- In many setups, you’ll run Tailscale for device-to-device access and a VPN for internet-protected routes, using careful routing to prevent conflicts.
Practical example setup: a typical small team scenario
- Devices: 3 laptops, 2 phones, 1 server
- VPN: Full-tunnel for all corporate traffic
- Tailscale: Private mesh for internal services Git, database, internal docs
- Settings:
- VPN DNS: Point to corporate DNS with a fallback
- Tailscale DNS: Enabled with MagicDNS for internal names
- ACLs: Tight but practical, allow only needed devices to reach each service
- MTU: Start at 1420, adjust if needed
Troubleshooting flow:
- Confirm Tailscale devices show online
- Verify DNS works by hostname resolution
- Test ping by Tailscale IP
- Switch VPN to full-tunnel, test again
- If issues persist, adjust ACLs and MTU
- Reintroduce split-tunnel in small steps and monitor
Tools and resources to stay ahead
- Tailscale documentation and troubleshooting guides
- VPN vendor support pages for split-tunnel and DNS settings
- Community forums and Reddit threads on VPN + Tailscale conflicts
- Your organization’s network admin guidance on routing policies
Frequently Asked Questions
Q1: Why is Tailscale not working when my VPN is on?
A1: The most common reason is conflicting routing and DNS rules between the VPN and Tailscale. DNS overrides and split-tunnel configurations often cause connectivity issues.
Q2: How do I fix DNS conflicts with Tailscale and VPN?
A2: Temporarily set a stable DNS resolver, disable VPN DNS overrides, and consider using Tailscale’s MagicDNS. Ensure hostname resolution works both with and without the VPN. Astrill vpn funziona in cina si ma solo se fai questo prima: guida pratica, alternative e consigli ultimi aggiornamenti
Q3: Should I use full-tunnel or split-tunnel with Tailscale?
A3: For testing, full-tunnel helps identify if the problem is tunnel routing. After identifying the conflict, you can optimize split-tunnel rules to allow Tailscale traffic while still using the VPN for other traffic.
Q4: What about MTU issues?
A4: MTU mismatches can cause packet loss. Start with a safe MTU 1280–1420 and adjust based on ping tests and observed fragmentation.
Q5: How can I test if the problem is DNS?
A5: Try resolving a Tailscale host by IP first, then by name. If IP works but hostname fails, DNS is likely the root cause.
Q6: Can firewall rules block Tailscale?
A6: Yes. Ensure the Tailscale and WireGuard ports are allowed, and that the firewall isn’t blocking Tailscale processes.
Q7: Does MagicDNS cause issues with VPN DNS?
A7: It can if VPN DNS overrides are too aggressive. You may need to disable VPN DNS or configure a split-tunnel that preserves Tailscale DNS resolution. Gxr World Not Working With VPN Here’s How To Fix It
Q8: How do I reset to a clean state?
A8: Reinstall Tailscale, reset VPN settings to default, and reconfigure step-by-step with careful testing after each change.
Q9: Can I use Tailscale on mobile behind cellular networks?
A9: Yes, but expect occasional DNS and roaming issues due to cellular networks. Verify with both VPN and Tailscale running, and adjust routes as needed.
Q10: Is there a recommended order to troubleshoot?
A10: Start with basic connectivity, then DNS, then routing split-tunnel/full-tunnel, then MTU, and finally firewall rules. Re-test after each step.
Q11: Should I keep both VPN and Tailscale active all the time?
A11: It depends on your security posture and workflow. If possible, keep Tailscale for internal device connectivity and use VPN for external access, but avoid overlapping routes that cause conflicts.
Q12: Where can I find the most up-to-date guidance?
A12: Check the official Tailscale docs, VPN vendor support pages, and community forums for the latest compatibility notes and fixes. Dedicated ip addresses what they are and why expressvpn doesnt offer them and what to do instead
If you found this guide helpful and you’re comparing VPNs for your setup, give NordVPN a try. The broad server network and strong privacy features can complement Tailscale in many environments. For quick access, you can use the affiliate link included in this guide: NordVPN.
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