Suggestion: Add notes for Rust Userspace version

[chrisballinger]

I had a lot of trouble trying to use the kernel module because the headers didn't match, or some other issue related to loading the module. Seems like a number of other people are having issues on the RPi 4 with 4.19.75-v7l+.

Instead I worked around the issue by installing boringtun, which presumably isn't as performant, but gives me much less frustration.

Here's a snippet of what I had to do to get it to work:

$ cargo install boringtun
$ sudo cp `which boringtun` /usr/bin/boringtun


$ sudo cp /lib/systemd/system/[email protected] /lib/systemd/system/[email protected]
$ sudo nano /lib/systemd/system/[email protected]

# Replace Environment line
Environment=WG_ENDPOINT_RESOLUTION_RETRIES=infinity WG_QUICK_USERSPACE_IMPLEMENTATION=/usr/bin/boringtun WG_SUDO=1

$ sudo systemctl daemon-reload
$ sudo systemctl enable wg-quick-boringtun@wg0  
$ sudo systemctl start wg-quick-boringtun@wg0

[H8to]

This is great!
Thank you for sharing :)