RTFM · Networking
When your ISP does not provide native IPv6
Native delegated IPv6 is simplest, but an IPv4-only connection can still be a useful place to learn and experiment.
Hurricane Electric options
Hurricane Electric provides free authoritative DNS hosting at dns.he.net, including A, AAAA, MX, TXT, and other record types, along with forward/reverse DNS and dynamic DNS features. It also operates a free IPv6 Tunnel Broker that can provide IPv6 connectivity over an IPv4 connection and may provide a routed /48.
Certification is worth doing
The certification programme walks through real skills: connectivity, web, mail, forward and reverse DNS, IPv6 nameservers, /64 and /48 concepts, and more. Someone who already understands IPv6 can work through it over several sessions or a couple of days, but it is educational for beginners too.
We earned IPv6 certification and Sage shirts around 2013/2014; ours lasted roughly ten years. That is our experience, not a guarantee that current participants receive a shirt. Check the present programme terms.
MailDragon warning
Hurricane Electric's current FAQ says SMTP TCP/25 over its IPv6 tunnels is filtered by default because of abuse. Do not tell a MailDragon operator that creating a tunnel automatically provides unrestricted SMTP. Current HE requirements, Sage certification status, and the process for requesting filter removal must be checked with HE.
A tunnel can still be valuable for web services, learning, administration, and IPv6 application testing. Use a different permitted mail path or provider arrangement if direct SMTP is not available.