Turn Windows into a Gateway with Brook

Updated at: 2024-01-01

Requirements

A Windows using wired network, since the wireless network card performance will be poor
Prevent machine from hibernating or sleeping
The upstream network of this machine needs to support dual-stack, and the downstream devices must disable IPv6
Your Brook Server must support dual-stack, and then use the IPv6 Brook Server here. Do not use the IPv4 Server, otherwise the machine will freeze
Turn off all Bypass-related modules

Enabling Forwarding

Open the Registry Editor (regedit).
Navigate to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters.
In the right pane, find the value IPEnableRouter, and set its data to 1 to enable IPv4 forwarding.
Restart the computer.

Run Brook

On this Windows, normally start Brook in TUN mode (The GUI defaults to TUN mode), or running a tun2brook is also fine.

Note that you should disable FakeDNS(The GUI defaults to having FakeDNS enabled). Because other devices do not have the route to the Fake IP, they can't communicate back, of course, you can tweak things yourself, but the I think this is a bit cumbersome and unnecessary.

Test

Try on other device:

Then set the gateway of the other devices to the IP of this Windows
Then set the DNS of the other devices to 8.8.8.8
```
curl http3.ooo -v
```

Restore

Change the value of the above registry entry to 0 and restart.

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