6rd config for brightspeed

I had IPv6 working with xfinity, then I just moved to brightspeed. So
I get to do this all again.

Their chatbot says I should configure it for 6rd.

I found and followed this rather old guide.
<https://undeadly.org/cgi?action=article&sid=20130828151241>

It didn't work. I believe I followed it correctly. The one doubt I
have is the chatbot didn't have a response for border IP address.
Actually its response was select stateless. But I found a centurylink
guide that had one.

Does anybody have any more recent pointers or a working config they
can share?

Thanks.

Jon