This free tunnel broker service allows you to reach the IPv6 Internet by tunneling over existing IPv4 connections from your IPv6-enabled host or router to
Read moreCategory: dualstack
Detecting phishing with spf macros
I run a test domain andritz.me with dual stack and mail enabled
SMTP server
ns.andritz.me 185.77.254.8 and 2a05:6740:40c0:4000:0:0:0:53
SPF record:
v=spf1 exists:i.%{i}.h.%{h}.o.%{o}.spf.andritz.me -all
%{ir} is replaced by the IP address
Moving to IPv6
http://www.trainsignal.com/blog/ipv6-implementation
Apache IPv6 Configuration: Dual Stacked IPv4 & IPv6 Virtual Hosts
http://www.cyberciti.biz/faq/ipv6-apache-configuration-tutorial