How to set up working X11 forwarding on WSL2

Question

When moving from WSL1 to WSL2 many things change; apparently this applies to X11 forwarding as well.
What steps do I need to make in order to use X11 forwarding with WSL

Answer 1

Using /etc/resolv.conf nameserver won't work for me since I disabled resolv.conf generation in /etc/wsl.conf (I have a custom resolv.conf).

Ultimately you want the WSL2 host IP address, which should also be your default route. Here's my ~/.bashrc entry for my Debian WSL2 distro:

export DISPLAY=$(ip route | awk '/^default/{print $3; exit}'):0