Fixing Clash Meta TUN Mode Internet Issues: Proper DNS Configuration

Experiencing connectivity issues in Clash Meta's TUN mode often stems from improper DNS configuration. Ensuring that DNS settings are correctly configured is crucial for seamless internet access. Here's a comprehensive guide to address and resolve these issues.

Understanding the Role of DNS in TUN Mode

In TUN mode, Clash Meta creates a virtual network interface to manage network traffic. If DNS settings aren't properly configured, DNS queries might bypass the proxy, leading to potential DNS leaks and connectivity problems.

Steps to Configure DNS Settings in Clash Meta

1. Enable the Built-in DNS Server

Clash Meta offers a built-in DNS server designed to minimize DNS pollution and enhance network performance. To activate it, include the following in your configuration file:

yaml
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dns:
  enable: true
  listen: 0.0.0.0:53
  enhanced-mode: fake-ip
  fake-ip-range: 198.18.0.1/16
  default-nameserver:
    - 119.29.29.29
    - 114.114.114.114
  nameserver:
    - https://doh.pub/dns-query
    - tls://223.5.5.5:853
  fallback:
    - 'https://1.0.0.1/dns-query#DNS'
    - 'tls://8.8.4.4:853#DNS'
  fallback-filter:
    geoip: false
    geosite:
      - gfw
    domain:
      - '+.example.com'
    ipcidr:
      - 0.0.0.0/32

Explanation:

• enable: Activates the DNS service.
• listen: Sets the listening address and port for DNS queries.
• enhanced-mode: Uses 'fake-ip' mode to intercept DNS requests, allowing Clash to manage domain resolutions effectively.
• fake-ip-range: Defines the IP range for fake IP addresses.
• default-nameserver: Specifies default DNS servers for resolving domain names.
• nameserver: Lists primary DNS servers, supporting DoH and DoT protocols.
• fallback: Provides backup DNS servers, with the option to route queries through specific proxies by appending the proxy name after a # symbol.
• fallback-filter: Configures filtering rules for fallback DNS servers, including geoip, geosite, domain, and ipcidr filters.

For a detailed explanation of these settings, refer to the Clash Meta DNS Configuration Documentation.

2. Configure TUN Settings

Proper TUN configuration ensures that all traffic, including DNS queries, is routed through Clash Meta:

yaml
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tun:
  enable: true
  stack: system
  auto-route: true
  auto-detect-interface: true

Explanation:

• enable: Activates TUN mode.
• stack: Specifies the network stack to use; 'system' is recommended for better performance.
• auto-route: Automatically manages routing rules to ensure traffic passes through the TUN interface.
• auto-detect-interface: Automatically detects the network interface for routing.

More details are available in the Clash Knowledge Base on TUN Device.

3. Disable Browser Features That May Cause DNS Leaks

Modern browsers have features like QUIC and Secure DNS that can bypass proxy settings:

• Disable QUIC Protocol:

• In Chrome, navigate to chrome://flags/#enable-quic and set it to 'Disabled'.

• In Edge, go to edge://flags/#enable-quic and disable it.

• Disable Secure DNS:

• In Chrome, go to chrome://settings/security and turn off 'Use Secure DNS'.

• In Edge, navigate to edge://settings/privacy and disable 'Use secure DNS to specify how to look up the network address of websites'.

Disabling these features ensures that DNS queries are handled by Clash Meta, preventing potential leaks.

4. Adjust System Settings to Prevent DNS Leaks

• Disable Smart Multi-Homed Name Resolution (Windows):
• Press Win + R, type gpedit.msc, and press Enter.
• Navigate to Computer Configuration > Administrative Templates > Network > DNS Client.
• Find and enable 'Turn off smart multi-homed name resolution'.

This setting prevents the system from sending DNS queries over multiple network interfaces, which can cause leaks.

Conclusion

By meticulously configuring the DNS and TUN settings in Clash Meta and adjusting browser and system settings, you can resolve connectivity issues and prevent DNS leaks in TUN mode. Regularly updating your configurations and staying informed about potential leaks will ensure a secure and seamless browsing experience.