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Configuration·8 min read·06 / 30

System proxy, PAC or TUN: choose the least complex mode that works

System proxy covers applications that honor OS settings, PAC decides by rule, and TUN captures a wider set of traffic through a virtual interface.

Steps

  1. Start with Set system proxy. If browsers and your normal applications work, there is no reason to enable TUN immediately.
  2. Use PAC when applications support system proxy and you need simple domain-based direct/proxy decisions. Test both local and proxied destinations.
  3. Enable TUN only for games, store apps or software that ignores system proxy, and grant only the permissions the feature needs.
  4. After switching modes, test the browser, target app, DNS and LAN access. Change one variable at a time.

Why this matters

System proxy is easy to reverse. TUN is broader but introduces virtual-adapter, DNS and routing failure modes. Starting simple keeps troubleshooting clear.

How to verify

The target app works, local printers or routers remain reachable, and exiting v2rayN restores the expected system state.

Things to watch

TUN is not a speed boost and cannot fix a bad server profile. Corporate VPNs, virtual machines and security tools may conflict with virtual routes.

Official references

System proxy and routing↗UI and advanced settings↗