Worst advice ever :-(. Many ISPs (and hosters) do support IPv6, and it’s worthwhile to learn a bit about it. If you are running an internet-facing server, I’d

Worst advice ever :-(. Many ISPs (and hosters) do support IPv6, and it’s worthwhile to learn a bit about it. If you are running an internet-facing server, I’d say it’s part of being a good citizen to support the latest standards. To address the parent question, the firewall rules actually need to be a bit different than for IPv4. As an example, IPv6 makes supporting ICMP (for ping and the like) mandatory. I wrote a post with a simple ip6tables setup about 4 years ago (in German, though, and there might be better posts): http://blogs.noname-ev.de/commandline-tools/archives/74-ip6tables,-grundlegendes-Setup-bei-IPv6.html http://blogs.noname-ev.de/commandline-tools/archives/74-ip6t...