Urgh, this month I learned you should *not* block #ipv6 ICMP traffic, or you'll have some *interesting* connectivity issues.

Let's cut the bullshit and spell out a few things. The IT security industry is about as trustworthy as the food supplement and vitamin industry, but somehow they escaped the same reputation. Their products are overwhelmingly based on flawed ideas, and the quality of their software is exceptionally bad. And while not everyone will agree with the harshness of my words, I'll say this: Essentially everyone in IT security who knows anything in principle knows this.