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Introduction
Yes, you can get your WireGuard tunnel back online fast. This guide walks you through practical, no-fluff steps to fix a WireGuard connection that shows “no internet access.” Think of this as a step-by-step playbook: check basic network status, verify configs, test routes, and apply quick fixes that actually work. We’ll cover common causes from DNS woes to MTU mismatches, plus handy tips you can implement today. Along the way, you’ll find bite-size formats—checklists, quick tests, and small tables—that make troubleshooting painless. If you’re in a rush, jump to the sections that match your symptoms.
Useful resources unlinked text
NordVPN – dpbolvw.net/click-101152913-13795051?sid=0401
WireGuard official documentation – wireguard.com
RFC 9000 MTU and path MTU discovery basics – ietf.org
IKEv2 vs WireGuard comparison – techblog.example
What you’ll learn
- How to confirm your VPN tunnel status and internet reachability
- Common culprits behind “no internet access” in WireGuard
- Step-by-step fixes: DNS, routing, MTU, firewall, and peer configuration
- Quick tests you can run to verify each fix
- An extensive FAQ to cover edge cases
Section overview
- Quick checks and basic troubleshooting
- Confirming tunnel status and reachability
- Connection setup and config sanity checks
- Network path and MTU troubleshooting
- DNS and split tunneling considerations
- Firewall, NAT, and port-forwarding tips
- Advanced troubleshooting for stubborn cases
- FAQ
Quick checks and basic troubleshooting
Before diving into configs, start with the basics. It’s easy to overlook the obvious.
- Is your host internet working without the VPN? Try loading a web page or pinging a known host.
- Is the WireGuard service running? Check the status on your device systemctl status wg-quick@your-profile on Linux, or the corresponding service manager on other systems.
- Are the peers online? If you’re using a commercial provider or a self-hosted server, verify the server status.
- Are you connected to the correct profile? A mix-up between profiles can cause a tunnel that looks connected but has no traffic.
Checklist
- Internet works without VPN
- WireGuard service running
- Correct profile selected
- Server/peer reachable ping, traceroute
- Local firewall not blocking
Confirming tunnel status and internet reachability
Start with a health check for the tunnel. You should see a valid handshake and non-zero transfer data in the interface statistics.
What to check
- Handshake time and last handshake timestamp
- Interface IP address assigned by WireGuard
- Routes: default route via WireGuard or specific allowed IPs
- DNS resolution through the VPN test with nslookup or dig
Quick tests Why Your VPN Isn’t Working With Virgin Media And How To Fix It
- Run: wg show
- Look for latest handshake: a recent timestamp means the peer is reachable.
- Check transfer counters to ensure data is moving.
- Check assigned IPs: you should see an IP from your VPN pool on the WireGuard interface e.g., wg0 with 10.0.0.x/24.
Expected outcomes
- Handshake recent within minutes
- IP address configured on wg0 or your interface
- Traffic routes show a default route through the VPN when intended
Connection setup and config sanity checks
Your WireGuard config is the heart of the tunnel. A small misconfiguration can break all traffic.
Key parts of a typical config
- block: PrivateKey, Address, DNS optional
- block: PublicKey, AllowedIPs, Endpoint, PersistentKeepalive optional
Common mistakes
- Incorrect AllowedIPs: too permissive or too restrictive
- Wrong Endpoint or port
- Misplaced DNS servers that don’t resolve through the tunnel
- PrivateKey/publicKey mismatches between peer and server
Checklist for config sanity Will a vpn work with a mobile hotspot everything you need to know
- PrivateKey corresponds to the correct key pair
- Address matches your VPN subnet and non-overlaps with local network
- Endpoint hostname/IP and port are correct
- PublicKey on the peer matches the server’s key
- AllowedIPs includes 0.0.0.0/0 for full-tunnel or appropriate routes for split-tunnel
- PersistentKeepalive set optional but helpful for NAT traversal
Step-by-step verification
- Validate keys: ensure you’re using the generated keys for both ends.
- Validate addresses: ensure no IP conflicts with your LAN.
- Validate endpoint: test DNS for the endpoint hostname; if it fails, you may need to use an IP or fix DNS.
- Validate routing: check that the default route points through the VPN when you want full-tunnel, or that only specific subnets go through the VPN for split-tunnel.
- Apply and test: restart the WireGuard interface and test connectivity.
Network path and MTU troubleshooting
Sometimes the issue is not authentication but the data path. MTU problems and routing mishaps are common culprits.
MTU matters
- If MTU is too large for the path e.g., 1420 or 1500 with extra headers, packets fragment or get dropped, leading to “no internet access” symptoms.
- Typical VPN MTU settings range from 1280 to 1420 depending on the network path; start with 1420 and adjust downward if you see fragmentation or connection drops.
How to adjust MTU
- In your , you can set MTU = 1420 or 1280 to start.
- If you frequently see connectivity issues, try 1360, then 1300, and so on, testing after each change.
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- Use ping with the DoNotFragment flag to determine the maximum packet size that passes through the path:
- On Windows: ping
-f -l - On Linux/macOS: ping -M do -s
- On Windows: ping
- Start with size = 1420, decrease by 10-byte steps until you no longer see fragmentation.
Routing checks
- Ensure there is a default route via wg0 if you want all traffic through the VPN.
- For split-tunnel, verify AllowedIPs correctly restricts only the intended subnets.
DNS and split tunneling considerations
DNS leaks can make it seem like you have no internet access when, in fact, DNS queries fail.
DNS through VPN
- Set DNS servers in the section to those provided by the VPN or use public DNS that resolves over the tunnel.
- If your VPN doesn’t provide DNS, explicitly use a DNS that works through the tunnel or set DNS via your OS to force DNS through the VPN.
Split tunneling
- Pros: local network access without VPN, reduced load on VPN, faster local resources.
- Cons: potential DNS leaks and inconsistent routing.
- Best practice: only route sensitive destinations through the VPN e.g., corporate resources while leaving general internet traffic on the local network, if your threat model allows.
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- From inside the VPN, resolve a domain that should be reachable only through the VPN.
- Try a DNS leak test from the VPN-connected device to confirm that DNS queries aren’t leaking to your local DNS.
Common DNS issues and fixes
- Issue: DNS resolution works locally but not over VPN.
- Fix: configure DNS servers in WireGuard or rely on the VPN’s DNS; ensure no firewall blocks outbound DNS 53/UDP.
- Issue: DNS queries are slow or time out.
- Fix: switch to faster public DNS or enable DNS over TLS if supported.
Firewall, NAT, and port-forwarding tips
Firewall rules can silently block traffic, making the VPN appear connected but unusable.
Firewall checks
- Ensure UDP port used by WireGuard often 51820 or your custom port is allowed through the firewall on both ends.
- Allow traffic from the VPN subnet to the internet if you’re routing all traffic through the VPN.
- Confirm that NAT is configured if you’re behind a router; you may need to masquerade or SNAT the WireGuard interface.
NAT and MASQUERADE
- On Linux, a common setup is:
- iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
- Replace eth0 with your actual internet-facing interface.
- Ensure IP forwarding is enabled:
- sysctl -w net.ipv4.ip_forward=1
Port-forwarding considerations Cyberghost vpn gui for linux your ultimate guide: Your Complete, Up-to-Date Guide to Using CyberGhost VPN GUI on Linux
- If you’re behind a consumer router, you typically don’t need to port-forward for WireGuard, but some setups with site-to-site require it.
- If you’re using a corporate firewall or NAT, verify that the correct UDP port is allowed and that VPN traffic is not being dropped by security policies.
Troubleshooting firewall issues
- Temporarily disable local firewall and test connectivity remember to re-enable afterward.
- If VPN works after disabling firewall, reintroduce rules incrementally to identify the culprit.
Advanced troubleshooting for stubborn cases
If you still see “no internet access” after the basics, try these advanced steps.
- Capture traffic with tcpdump or Wireshark on the WireGuard interface to see if packets leave the host.
- Verify MTU path discovery by testing fragmentation as described earlier.
- Check for IPv6 issues: if your tunnel also carries IPv6 and your DNS or routes aren’t set up for IPv6, disable IPv6 in the tunnel or fix IPv6 routes.
- Inspect peer configuration for ACL-type restrictions: some servers apply policies that restrict certain destinations; ensure AllowedIPs aligns with what you expect to route.
- If you’re using a dynamic endpoint hostname, DNS resolution failures can break the handshake; try using a static IP for the Endpoint to isolate DNS issues.
- Review system logs journalctl -u wg-quick@wg0 or equivalent for error messages or handshake failures.
Performance tips
- Keep-Alive: enable PersistentKeepalive every 25-60 seconds if you’re behind NAT or a firewall that closes idle connections.
- Choose a nearby server to reduce latency and packet loss.
- Consider split tunneling for stability if full-tunnel causes instability with your network.
Table: common symptoms and quick fixes
| Symptom | Likely cause | Quick fix |
|---|---|---|
| No internet access, handshake ok | DNS through VPN fails | Set VPN DNS, test with dig/nslookup, disable local DNS leaks |
| No internet access, no handshake | Wrong endpoint or keys | Re-check public/private keys, endpoint, and firewall |
| Slow connection or timeouts | MTU too large | Adjust MTU downward in Interface; test with ping DoNotFragment |
| Local LAN unreachable | Non-routable AllowedIPs | Update AllowedIPs to include local subnets if needed, adjust routing |
| VPN connects but only some sites load | Split tunneling misconfiguration | Review AllowedIPs, traffic rules, and DNS settings |
Example configurations: quick-start templates
Template A: Full-tunnel, Linux wg-quick Vpn Monster On Windows 10 Does It Work And Should You Actually Use It
PrivateKey = your_private_key
Address = 10.8.0.2/24
DNS = 1.1.1.1
PublicKey = server_public_key
Endpoint = vpn.example.com:51820
AllowedIPs = 0.0.0.0/0
PersistentKeepalive = 25
Template B: Split-tunnel, Linux wg-quick
PrivateKey = your_private_key
Address = 10.8.0.2/24
PublicKey = server_public_key
Endpoint = vpn.example.com:51820
AllowedIPs = 10.8.0.0/24, 192.168.1.0/24
PersistentKeepalive = 25 Nordvpn en Chine le guide ultime pour naviguer sans limites en 2026
Template C: Windows PowerShell WireGuard GUI-friendly
- Install WireGuard
- Create a config:
- PrivateKey=
Address=10.8.0.2/24 DNS=1.1.1.1 - PublicKey=
Endpoint=vpn.example.com:51820 AllowedIPs=0.0.0.0/0
- PrivateKey=
- Save and activate
Notes for users
- Always back up your config before making changes.
- If you’re using a managed or hosted VPN service, consult their help docs for recommended settings, but you’ll still benefit from the general troubleshooting steps here.
Real-world troubleshooting examples
Example 1: DNS breaking VPN on a Linux laptop
- Symptom: Web pages load sometimes, but DNS queries fail when connected to VPN.
- Fix: Set DNS server in to a reliable resolver that works over VPN e.g., 1.1.1.1 or your corporate DNS. Verify no DNS leaks with a DNS leak test.
Example 2: WireGuard on a home router with “no internet access”
- Symptom: VPN shows connected, but nothing else works on all devices behind the router.
- Fix: Enable NAT on the router for the wg0 interface; ensure IP forwarding is enabled; verify firewall rules don’t block VPN traffic.
Example 3: MTU drift causing timeouts Does nordvpn renew automatically heres how to manage your subscription
- Symptom: VPN connects but pages fail to load; large packets get dropped.
- Fix: Reduce MTU to 1360 or 1280, retest with ping DoNotFragment.
Example 4: Split-tunnel misconfig leading to local resources inaccessible
- Symptom: You can access local devices but not corporate resources.
- Fix: Update AllowedIPs to include the corporate subnet and adjust routes accordingly.
Frequently Asked Questions
How do I know if WireGuard is connected?
You can run wg show or check your system’s network interface e.g., ip a on Linux. Look for a recent handshake timestamp and non-zero transfer counters on the wg0 interface.
What is the best MTU for WireGuard?
MTU depends on the path. Start with 1420 and lower in small steps 1360, 1300 until you don’t see fragmentation or dropped packets. The exact value can vary by network.
Should I use DNS through VPN?
For privacy and leak prevention, yes—use DNS provided by the VPN or a trusted DNS that resolves over the tunnel. If DNS leaks occur, adjust DNS settings in the config or your OS.
How can I tell if a firewall is blocking WireGuard?
Temporarily disable the firewall to test connectivity. If the VPN works, reintroduce rules incrementally to identify the culprit. Does nordvpn provide a static ip address and should you get one
What if handshake is not updating?
Ensure the server is reachable, the endpoint is correct, and keys match. Check for NAT or firewall blocks, and verify that the server’s public key is correct in the peer config.
Can I run WireGuard on a router?
Yes. Many home routers support WireGuard either natively or via a firmware like OpenWrt. You’ll want to configure NAT and ensure the device forwards traffic properly.
How do I test DNS resolution through the VPN?
From a device connected to the VPN, run nslookup or dig for a domain and verify the response. Compare with a non-VPN test to see if DNS is going through the tunnel.
My local network devices aren’t reachable when VPN is on. Why?
This usually means your AllowedIPs don’t include your local subnets, or your routing rules isolate LAN access. Adjust AllowedIPs or set a specific route that excludes your local network.
What is PersistentKeepalive and should I enable it?
PersistentKeepalive helps maintain a NAT mapping alive on devices behind NATs or firewalls. It’s a good idea to enable it if you’re experiencing dropped connections or if you’re behind a firewall that closes idle connections. Does nordvpn comply with law enforcement the real story
Can I mix IPv4 and IPv6 with WireGuard?
WireGuard supports both, but mixing can cause complexity. If you don’t need IPv6, disable it in the config to reduce potential issues.
How do I diagnose a stubborn issue where nothing works?
- Recheck keys, endpoint, and AllowedIPs.
- Test from another device to see if the issue is device-specific.
- Capture traffic with tcpdump or Wireshark to see if packets are entering and leaving the interface.
- Temporarily disable security software that might block VPN traffic.
If you found this guide helpful and you’re looking to keep your online activity secure, consider trying a trusted VPN service. For a quick, reliable option, you can explore NordVPN by clicking here: NordVPN to learn more and start a trial. If you’re using WireGuard for both personal and professional use, this can help you maintain strong encryption and simplify access across devices.
Sources:
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