Hide Client IP from Server (VPN Tunneling)
A VPN tunnel can make destination servers see the VPN’s public egress IP instead of your device’s public IP. For reliable coverage, route IPv4 and IPv6 through the VPN, or block IPv6, send DNS through the tunnel, and use a fail-closed firewall rule. The VPN provider can still see the IP address used to connect to it.
If your goal is to keep websites and other destination services from seeing your home or office IP, the key is routing, not just connecting to a VPN. A connection can appear active while some traffic still uses your regular network. I use a simple sequence to check the route, DNS, and what happens if the tunnel drops.
Plan what the VPN should hide
A VPN creates an encrypted connection between your device and a VPN endpoint. Destination services usually see the endpoint’s public IP when your traffic exits there. The VPN provider can generally see your original connection IP, so first decide which party you want to keep it from.
A VPN is useful when the privacy boundary is between your device and the destination service. It does not make your activity anonymous, and it does not remove other identifying details such as account logins or browser fingerprints.
Before changing settings, note your device’s operating system, VPN provider, supported protocol, and whether the service supports IPv4 and IPv6. Also decide whether every app should use the tunnel. For the goal in this guide, full-tunnel routing is the clearest starting point. Split tunneling sends some traffic outside the VPN and can expose your regular IP to those destinations.
NIST SP 800-77 Rev. 1 offers guidance on IPsec VPNs, and RFC 4301 describes the IPsec architecture. WireGuard is defined in its project documentation, not in an IETF RFC. These references describe VPN technologies; your provider’s instructions determine how to configure its service.
Configure full-tunnel routes, DNS, and IPv6
Full-tunnel routing sends a device’s internet traffic through the VPN rather than only selected networks. For IPv4, the route should cover 0.0.0.0/0; for IPv6, it should cover ::/0, or IPv6 must be blocked outside the tunnel.
Ask the provider which protocol, endpoint, and authentication method it supports. Use its maintained client and current recommended cryptographic settings. Avoid weakening encryption settings to work around a connection problem.
DNS matters too. DNS is the system that looks up a site name, such as example.com, and returns an address. Configure it to use a resolver reachable through the tunnel, and prevent the device from falling back to the local network’s resolver if the VPN is unavailable.
IPv6 needs its own check. An IPv4-only VPN may leave native IPv6 traffic on the regular network, even while the VPN says it is connected. Either route IPv6 through the VPN or block it with a firewall rule that also applies when the tunnel fails.
| Setting | Full-tunnel target | What to check |
|---|---|---|
| IPv4 route | 0.0.0.0/0 through VPN | No internet-bound IPv4 route bypasses the tunnel |
| IPv6 route | ::/0 through VPN, or IPv6 blocked | IPv6 test does not show your regular-network address |
| DNS | Resolver reached through VPN | DNS tests do not show local-network fallback |
| Disconnect behavior | Non-tunnel traffic denied | Internet access stops when the tunnel drops |
Apply fail-closed protection
A fail-closed kill switch blocks traffic that would otherwise leave through the regular network when the VPN is down. It is stronger than a setting that only tries to reconnect, because reconnection may take time and traffic could escape during that gap.
Look for a persistent kill switch in the provider’s client. Confirm whether it applies to all apps, both address families, and all networks. If you configure firewall rules yourself, use rules supported by your operating system and VPN client. A generic rule can cut off needed traffic, including VPN reconnection, so do not copy one without checking the platform’s documentation.
For a manual setup, the policy should allow traffic to the VPN endpoint as needed, allow intended traffic through the tunnel interface, and deny other outbound traffic when the tunnel is unavailable. The exact rule order and interface names vary by operating system and client. Test changes with a second way to access the device before relying on them.
I treat “VPN connected” as a status, not proof that every route is protected. The firewall policy is what should prevent a brief drop from sending traffic outside the tunnel.
Verify routes, IP addresses, and DNS
Verification checks what a destination can observe while the VPN is on and whether traffic stops when it is off. Results apply only to the device, network, and settings tested. Repeat the checks after updates or network changes.
Start with the provider’s app and confirm the endpoint and connection state. Then check routes and run separate IPv4 and IPv6 tests. A changed IPv4 result alone is not enough if the device can still use IPv6.
On Linux, these commands show route and resolver information:
ip route
ip -6 route
resolvectl status
Look for the VPN interface as the route for internet-bound traffic. A full IPv4 route covers 0.0.0.0/0. A full IPv6 route covers ::/0. If IPv6 is intentionally blocked, confirm the firewall blocks it outside the tunnel.
To check the address seen by a test destination, run:
curl -4 https://api.ipify.org
curl -6 https://api64.ipify.org
The second request needs working IPv6 access to the test service. If it fails, that alone does not prove IPv6 is safely blocked; check the route and firewall too. On Windows, inspect routes with Get-NetRoute -AddressFamily IPv4 and Get-NetRoute -AddressFamily IPv6, and check DNS settings with Get-DnsClientServerAddress. You can use curl.exe -4 and curl.exe -6 for address tests if those options are supported in your environment.
A configured DNS address does not by itself prove where a query went. Use a DNS leak test while connected, and compare the reported resolver with the VPN’s documented DNS behavior. A local resolver shown by a command may forward queries elsewhere, so interpret results with care.
Finally, test failure behavior. With the kill switch enabled, disconnect the VPN or use the client’s documented test method. Try to load a new page and repeat the address check. Expected result: non-tunnel internet traffic is blocked until the VPN reconnects. Do not rely on this test if you cannot safely restore your connection.
Practical scenarios and troubleshooting
These scenarios are illustrative examples, not reports of specific clients. They show how the same checks can help with common setups. The result depends on the VPN service, operating system, and network.
| Scenario | What can go wrong | Next step |
|---|---|---|
| Laptop on home Wi-Fi | IPv4 uses the VPN, but IPv6 uses the home connection | Test both address families; route IPv6 through the VPN or block it |
| Phone moves between Wi-Fi and mobile data | The tunnel reconnects, but traffic may pass during a gap | Enable the client’s always-on or kill-switch option if supported, then test a drop |
| Small office with split tunneling | Some apps use the VPN while others use the local route | Review app and route exclusions; remove them if all traffic must use the tunnel |
| VPN connects but sites show the usual IP | A route, DNS, or firewall setting may be incomplete | Check IPv4, IPv6, DNS, and the default routes separately |
In a typical laptop check, I would first confirm the VPN is connected, then compare the destination-observed IPv4 and IPv6 addresses with the address seen before connecting. If IPv4 changes but IPv6 does not, I would correct IPv6 handling rather than treating the connection as protected. If the IP tests look right but the DNS test reports the local resolver, I would check the provider’s DNS settings and any fallback behavior.
Maintain the setup
VPN protection can change after an operating system update, a client update, a switch between Wi-Fi and mobile networks, or a firewall change. Keep the VPN client current and repeat the route, IP, DNS, and disconnect checks after changes that may affect networking.
Keep a short record of the settings that matter: protocol, IPv4 and IPv6 behavior, DNS choice, split-tunneling status, and kill-switch status. That makes it easier to spot a change later. Do not treat a single successful test as proof for every device or network.
Frequently asked questions
Does a VPN hide my IP address from websites?
Usually, a correctly routed VPN connection makes destination websites see the VPN’s egress IP rather than your device’s public IP. Confirm this with separate IPv4 and IPv6 tests. A website may still identify you through an account, cookies, or other information.
Can my VPN provider see my original IP?
In general, yes. The provider receives your connection from your network and routes traffic onward. A VPN changes which IP destination services see; it does not hide your original connection IP from the VPN operator.
Is an IP address check enough to confirm protection?
No. Check IPv4 and IPv6 separately, test DNS behavior, and confirm that traffic is blocked when the VPN disconnects. A result only covers the device, network, and configuration used for that test.
Why does IPv6 matter if my VPN is connected?
IPv4 and IPv6 are separate network protocols. If the VPN handles IPv4 but not IPv6, a device may send IPv6 traffic over its regular connection. Route IPv6 through the tunnel or block it outside the tunnel.
Does changing DNS hide my public IP?
No. DNS resolves names to network addresses, but changing the resolver does not route all internet traffic through a VPN. Use tunnel routing, tunnel-reachable DNS, and leak controls for this goal.
Is split tunneling suitable for hiding my IP from every destination?
Not if excluded apps or destinations use your regular connection. Split tunneling is designed to send selected traffic outside the VPN. Review the exclusions or disable split tunneling when all traffic should use the tunnel.
What should happen when the VPN drops?
With a working fail-closed kill switch, traffic that would leave outside the tunnel should be blocked until the VPN reconnects. Test this behavior on each device rather than assuming the setting works everywhere.
How often should I repeat the tests?
Repeat them after VPN or operating system updates, firewall changes, or changes in network access. Also test each device separately, since one device’s successful result does not verify another’s configuration.
Which VPN protocol should I use?
Use a protocol supported by your provider and maintained client, with the provider’s current recommended settings. NIST SP 800-77 Rev. 1 discusses IPsec VPN guidance. WireGuard details are published in the project’s documentation.
Can private browsing replace a VPN tunnel?
No. Private browsing does not route traffic through a VPN or change the public IP seen by destination services. It is not a substitute for full-tunnel routing and leak protection.
(This article was written by one of our staff writers, Richard Montclair. Visit our Meet the Team page.)
