Setting up a very simple (but IPv6 capable) home router with OpenBSD 7.7 (or 7.8!)

[When I wrote this post, I used OpenBSD 7.7. In the less-than-a-month since I posted this, OpenBSD 7.8 has been released! I&rsquo;ve upgraded my router, and all the advice below is still applicable with 7.8] &#xA; I&rsquo;ve just replaced our old home router with a tiny OpenBSD router, and I&rsquo;ve been surprised and delighted by it. &#xA; The old router - a TEW813-DRU - was getting long in the…