Why Enabling TUN Mode Bypasses Geo-Restrictions
First, the reason we usually hit geo-restrictions is that certain services are only available to users in specific regions. If your IP doesn’t match these regional restrictions, you’re blocked.
If you log in using a US IP through proxy mode, these services won’t recognize you as being from the US.
This is related to how proxy mode works.
How Proxy Mode Works
Every computer operating system has a built-in network proxy feature. When you enable proxy mode in the Clash client, it writes a proxy configuration to this OS-level network proxy setting.
When other apps send requests, they can choose whether to use your network proxy or not. It’s just an operating system configuration item. Many common programs like command-line tools don’t bother with this setting at all — they send requests through the normal network path directly.
So you often find that even with the proxy enabled, command-line software updates are still painfully slow, because these tools couldn’t care less about this configuration. But browsers and similar applications will respect your proxy settings for their requests.
Many geo-restricted services simply don’t honor your network proxy configuration, so they don’t recognize you as a US IP.
How TUN Mode Works
TUN mode works by creating a virtual network interface on your computer. Since the network interface is the final exit point for all traffic, this effectively hijacks all your traffic. Most applications don’t check for this either, so using TUN mode allows you to better conceal whether you’re running a proxy.
Once you enable this mode, those geo-restricted services are already convinced they’re in a US IP network environment.
Because it involves intercepting all traffic, you need administrator authentication when using TUN mode.
Core Differences Between the Two Modes
| Feature | Proxy Mode | TUN Mode |
|---|---|---|
| Principle | OS-level proxy configuration item | Virtual interface intercepts all traffic |
| Coverage | Only apps that respect proxy settings | All network traffic |
| Stealth | Low — apps can choose to ignore | High — systematically intercepts |
| Permission Required | No special permissions | Administrator authentication required |
| Command Line Effect | Usually ineffective | Effective |
Tips: In older versions of Clash software, TUN mode was called Enhanced mode.
I also saw some Twitter users mentioning the need to change Google addresses. I tested it myself today and it’s not necessary — my Google region is Singapore.