Turn any Linux into a router with two Brook commands

https://www.txthinking.com/talks/
Updated at: 2023-03-19
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Requires

A Linux using wired network, such as Ubuntu, it is recommended to configure a static IP first, such as 192.168.1.10

In theory, a virtual machine would work too. The macOS or Windows using wired network is the host machine, and a virtual machine Ubuntu is installed in it, but the performance may not be good.

Disable systemd-resolved which uses port 53

systemctl stop systemd-resolved
systemctl disable systemd-resolved
echo nameserver 8.8.8.8 > /etc/resolv.conf

Turn Linux into a gateway

brook tproxy --link 'brook://...' --dnsListen :53

Then configure the DNS and gateway of other machines to the IP of this Linux

• 😡 If the DNS configuration of other machines is not the IP of this Linux, such as 8.8.8.8, and you allow clients to do so, then your --dnsListen needs to explicitly specify the IP of the listening Linux, such as 192.168.1.10:53
• brook tproxy will not proxy current linux traffic. So if you still need to proxy current linux traffic, you can choose brook CLI to create socks5，or tun2brook，or Brook GUI for Linux
• more brook tproxy --help

Turn Linux into a DHCP Server

• For example, you want the client to automatically obtain IP, gateway, and DNS instead of manually configuring
• For example, some devices cannot manually configure the gateway and DNS, such as Google Home, Chromecast Google TV, Apple TV

😡 Turn off other DHCP services in the LAN, such as turning off the DHCP of your hardware router

brook dhcpserver --serverip 192.168.1.10 --start 192.168.1.100 --gateway 192.168.1.10 --dnsserver 192.168.1.10

• Adjust the specific parameters according to your own situation, see brook dhcpserver --help