[SpenserJ]

I haven't enabled IPv6 on any of my servers yet, as I can say with 99.9% certainty that my visitors do not know what it is, let alone have it enabled. Additionally, this is intended as a quickstart or beginners guide, and obviously leaves quite a bit out. That being said, it is definitely something you want to consider, and I've added a followup to the post mentioning that.

[txutxu]

The problem with IPv6 was not that it could be enabled... it's that it is enabled by default. In all major linux distributions.

That being said, I've read your update, and that is the point that people seeking for "recipes" should get. If they are going to touch ssh or iptables, they need to be ready to explore the documented options (which are many), to validate that the changes are working, to dive into networking, etc.