Selective wireguard use with a namespace

Today I decided to make a clean Wireguard client configuration on my dev computer, that would allow accessing any IP with any program while letting any other traffic out without going through it. I quickly found a post on the infamous Pro Custodibus blog , which contains many great Wireguard configs I&rsquo;ve used countless times ( Renn.es &rsquo;s VPS-to-homeserver tunnel couldn&rsquo;t have…