Why TUN mode matters on Windows

If you are searching for Clash Verge Rev TUN mode, you have probably already noticed that enabling the normal system proxy does not control every application. Browsers and many desktop programs read Windows proxy settings, but command-line tools, game launchers, development environments, virtual machines, background services, and applications with their own network stack may connect directly. The result is a confusing split: a web page opens through Clash while another program reports a timeout, an API request fails, or a game ignores the selected proxy group completely.

TUN mode addresses that gap by creating a virtual network interface. Traffic from Windows is captured at the network layer and passed to the Mihomo core inside Clash Verge Rev, where your rules, proxy groups, DNS behavior, and final policy determine what happens next. In practical terms, the application does not need to understand HTTP or SOCKS proxy settings because its packets are intercepted before they leave the computer.

That does not mean TUN mode is automatically better for every situation. It changes the routing path for a much wider range of traffic, so a careless configuration can affect printers, corporate portals, local file shares, games, banking applications, or other services that should remain direct. The reliable approach is to enable it deliberately, verify that the virtual adapter is working, and inspect live connections instead of assuming that an enabled switch proves successful routing.

This guide focuses on Clash Verge Rev on Windows. Menu labels can vary slightly between releases, especially when the application changes between a stable build and a newer Mihomo-compatible build. Look for the same concepts: the TUN switch, service or administrator permission, a running profile, a selected mode, and the Connections or Logs view.

Check the profile and Windows prerequisites first

Before touching TUN mode, make sure Clash Verge Rev has a usable configuration. TUN mode can capture traffic, but it cannot invent proxy servers or repair an invalid subscription. Open the application and confirm that a profile has been imported, the profile parses without an error, and at least one proxy group contains a working node. If the profile was downloaded from a provider, keep the subscription URL private because it may contain an account token.

Next, close or disable other tools that may install a competing virtual adapter. Another VPN client, a previous Clash fork, a security product with traffic interception, or a virtualization utility can all create overlapping routes. Multiple tunnel drivers do not necessarily fail in an obvious way. You may instead see intermittent DNS resolution, a connection that alternates between direct and proxied paths, or a Windows route table that changes after every application starts.

It is also worth recording your current state before making changes. Note whether Windows system proxy is enabled, which DNS provider is active, and whether another VPN is connected. This gives you a clean comparison when troubleshooting. If TUN mode produces an unexpected result, you can return to the previous state rather than changing several unrelated settings at once.

  • Windows account: have access to an administrator account or be prepared to approve a Windows elevation prompt.
  • Clash profile: confirm that the selected configuration contains proxy groups and rules, not only an empty template.
  • Available node: test a node through the normal system proxy before diagnosing TUN mode.
  • Conflicting software: temporarily stop other VPNs, tunnel clients, and proxy managers.
  • Security software: be ready to review firewall or endpoint protection prompts without blindly disabling protection.

Testing the normal proxy first is important. If a browser cannot reach a test page through Clash when system proxy mode is active, TUN mode will not solve an unavailable node, an expired subscription, or a broken rule group. Establish one known-good baseline before expanding the routing scope.

Enable TUN mode step by step

Launch Clash Verge Rev normally and wait until the main interface shows that the Mihomo core is running. Select the profile you want to use, then open the settings area and locate the section named TUN, Service Mode, System, or a similar network-related label. The exact location depends on the build, but the setting usually appears near the core, proxy, or system integration options rather than inside an individual proxy group.

  1. Open Clash Verge Rev and select a valid active profile.
  2. Go to the settings page and locate the TUN mode switch.
  3. Turn on TUN mode and read the permission prompt carefully.
  4. Approve the administrator or service installation request if Windows displays one.
  5. Wait for the virtual interface or service status to change to running.
  6. Choose the intended operating mode, normally Rule mode for everyday split routing.
  7. Generate a test connection and confirm it appears in the Connections panel.

The permission request is expected because a transparent tunnel needs to create or control a virtual network interface and adjust routing behavior. If Windows asks whether the application may make changes, confirm that the publisher and file location match the Clash Verge Rev installation you intended to run. Do not approve an unrelated executable simply because its name contains “service” or “helper.”

Some versions separate the TUN switch from Service Mode. In that design, enable the service first, restart the application if requested, and then enable TUN. Other builds install the required service automatically when you toggle TUN. If the switch immediately turns itself off, do not repeatedly click it. Read the status message, restart Clash Verge Rev as administrator once, and check whether Windows Security or endpoint protection blocked the helper component.

For most users, Rule mode is the sensible first choice. It allows local networks and explicitly direct destinations to bypass the proxy while selected domains use the chosen proxy group. Global mode is useful as a diagnostic tool: if a destination works only in Global mode, the problem is probably a rule, DNS classification, or policy-group selection rather than the TUN driver itself. Direct mode is useful for returning to an unproxied baseline, but it should not be used as proof that TUN is broken.

Do not enable every advanced option at the same time. Options related to strict routing, auto-route, DNS hijacking, IPv6, and system proxy integration can each change the result. Start with the defaults recommended by the build, verify basic traffic, and then change one option at a time. A controlled sequence makes it possible to identify which setting caused a new failure.

Understand DNS, rules, and local network exceptions

A functioning TUN interface does not guarantee correct name resolution. Many routing failures that look like tunnel failures are actually DNS problems. A domain may resolve to an address that does not match the rule engine’s expectations, or a fake-IP response may be passed to an application that does not handle it correctly. During testing, compare a hostname-based request with the connection entry shown by Mihomo and note whether the request is classified as a domain, an IP address, or a fake-IP mapping.

Keep the first test simple. Use a normal HTTPS website, then try the application that originally motivated you to enable TUN. If the website works but the application fails, inspect the application’s destination names in the Connections panel. Do not add random domains from forum posts before you know what the program actually contacts. Modern applications often use separate hosts for login, API calls, updates, telemetry, downloads, and certificate checks.

Rule mode depends on the order and scope of your rules. A broad GEOIP,CN,DIRECT rule, a private-network rule, or a final DIRECT policy may be correct for local traffic but can also expose a destination that your profile does not classify as expected. When you see a failed connection, check the matched rule and the selected outbound group. The useful question is not only “is TUN enabled?” but also “which rule made this connection DIRECT?”

  • Keep local resources direct: printers, NAS devices, private IP ranges, and trusted office portals often should not traverse a remote node.
  • Check localhost behavior: development services on 127.0.0.1 or localhost should normally remain reachable without tunneling.
  • Review IPv6 separately: if IPv6 remains outside the intended path, an application may bypass the IPv4 rules entirely.
  • Watch UDP requirements: some games, calls, and discovery protocols need UDP behavior that a selected node or profile does not support.
  • Respect enterprise policy: do not bypass organizational controls or inspect traffic that your employer forbids you to intercept.

Windows applications can also retain connections for a long time. After changing a rule, mode, or DNS option, close and reopen the affected application instead of judging the change from an existing connection. In some cases, restart the application after flushing its own DNS cache. The Connections panel should show a new session with the updated rule and outbound group.

Verify that TUN mode is actually routing traffic

The Windows taskbar icon is not sufficient evidence. A client can display an enabled switch while the service is stopped, the profile is inactive, or traffic is excluded by a route. Use several independent checks so that one misleading indicator does not waste your time.

First, open the Clash Verge Rev Connections view and generate traffic from a program that normally ignores system proxy settings. The connection should appear with a destination, process or metadata information where supported, a matched rule, and an outbound proxy group. If the application is active but no corresponding connection appears, TUN capture may not be attached correctly, the process may be excluded, or the traffic may be using a protocol the current build does not handle as expected.

Second, compare an external IP or region test in two states: with TUN disabled and with TUN enabled. Use a service you trust and avoid treating a single web page as conclusive. The important evidence is a consistent change that agrees with the selected node and the outbound connection shown inside Clash. If the external result never changes, check whether the browser is using its own secure DNS or VPN feature, because that can obscure what the Windows network stack is doing.

Third, test the original application with a deliberately visible change. For example, temporarily select a different proxy group or use Global mode for one controlled request. If the connection entry changes group and the application behavior follows, the tunnel is capturing traffic and the remaining issue is likely policy selection. Return to Rule mode after the test and make the narrowest rule adjustment needed.

Command-line checks can provide additional evidence, but interpret them carefully:

ipconfig /all
route print
nslookup example.com
curl -I https://example.com

ipconfig can reveal whether a virtual adapter is present, while route print helps show whether Windows has installed the expected routes. These commands do not prove that every packet uses the proxy. The most valuable correlation is between a fresh command-line request, the route state, and a new entry in Clash Verge Rev Connections.

If your browser works but a terminal tool does not, remember that the terminal may still use its own proxy variables or a custom certificate store. If the terminal works but a game does not, inspect UDP behavior, game launcher processes, and exclusions. Verification should identify the traffic lane that fails rather than forcing every application into the same assumption.

Fix the most common Windows TUN problems

Permission or service errors

If TUN refuses to start, restart Clash Verge Rev with administrator privileges once and try again. Check Windows Event Viewer, Windows Security history, and any endpoint protection console for a blocked driver or helper. Avoid permanently disabling security software as a first response. A better fix is to verify the installation source, update to a compatible build, and add only the narrowly scoped exception permitted by your security policy.

TUN is enabled but no traffic appears

Confirm that a profile is active and that the Mihomo core is running. Check whether the target application was excluded, launched before TUN started, or is communicating through a separate VPN or sandbox. Restart the application, test with a simple command-line request, and compare the Connections panel. If only one program remains invisible, investigate that program’s protocol and network isolation rather than reinstalling Clash immediately.

Websites or local devices fail after activation

Temporarily switch to Global mode to distinguish capture problems from rule problems. If Global mode works, inspect Rule mode and preserve direct exceptions for local subnets, printers, intranet hosts, and trusted services. If everything fails, disable TUN and verify the normal proxy baseline, then review DNS and conflicting adapters. Rebooting Windows can be reasonable after a service or route change, but it should not replace reading the status message.

IPv6, UDP, or game-specific failures

Some nodes support TCP reliably but provide poor UDP performance, while some applications prefer IPv6 when it is available. Compare the application behavior with IPv6 disabled only as a controlled diagnostic, and restore the setting if your network requires it. For games and voice applications, inspect whether the selected profile and node support the required UDP path. A successful HTTPS browser test does not prove that real-time traffic will behave identically.

How to revert without losing connectivity

When troubleshooting becomes unclear, select Direct mode, disable TUN, and restore the Windows system proxy state you recorded earlier. Close applications that keep persistent sockets, then reopen them after the change. Once basic connectivity returns, enable TUN again with the simplest profile and default options. Make one adjustment per test and write down the result. This small habit is faster than changing DNS, rules, service permissions, and node groups simultaneously.

Choose a predictable routing workflow

Some lightweight proxy tools are easy to open but offer limited visibility when an application ignores system proxy settings. Others expose a tunnel switch without making rule matches, DNS decisions, process behavior, or outbound groups easy to inspect. On Windows, that lack of evidence turns a simple setup into guesswork. Clash Verge Rev is more useful for this scenario because its TUN workflow combines Mihomo routing, selectable Rule and Global modes, live Connections inspection, profile-based groups, and the ability to preserve direct access for local resources. If you want a Windows client that lets you see why traffic was routed instead of merely hoping a VPN icon means success, Download Clash for free and browse freely.