Does anyone have any experience in operating a ipv6-enabled site? What is involved?
Basic IPv6 is not that hard but when it comes to things like iptables you have to take care: Most iptables frontends can only handle IPv4 or do that as default. You have to take care of the IPv6 yourself or activate it.
E.g. Phusion Passenger/nginx installer did not activate the IPv6 module on compile time (not sure if this is still the case)
Also I've disabled all RA/autodiscovery functionality which is probably not a good idea to run/listen to on the server side anyway.
I can recommend a nice directory of IPv6 ready sites: http://sixy.ch/
Fast:~ schmidp$ host rails.io
rails.io has address 188.40.182.49
rails.io has IPv6 address 2a01:4f8:100:9461::49
rails.io mail is handled by 10 mail100.fks.de.moriz.net.
Fast:~ schmidp$ ping6 2a01:4f8:100:9461::49
PING6(56=40+8+8 bytes) 2001:470:1f0b:1751:685d:197d:eaff:7861 --> 2a01:4f8:100:9461::49
Request timeout for icmp_seq=0
Request timeout for icmp_seq=1
Request timeout for icmp_seq=2
^C
--- 2a01:4f8:100:9461::49 ping6 statistics ---
4 packets transmitted, 0 packets received, 100.0% packet loss
Fast:~ schmidp$ telnet -6 2a01:4f8:100:9461::49 80
Trying 2a01:4f8:100:9461::49...
^C
Fast:~ schmidp$ ping6 www.heise.de
PING6(56=40+8+8 bytes) 2001:470:1f0b:1751:685d:197d:eaff:7861 --> 2a02:2e0:3fe:100::7
16 bytes from 2a02:2e0:3fe:100::7, icmp_seq=0 hlim=59 time=28.155 ms
16 bytes from 2a02:2e0:3fe:100::7, icmp_seq=1 hlim=59 time=36.392 ms
^C
--- www.heise.de ping6 statistics ---
2 packets transmitted, 2 packets received, 0.0% packet loss round-trip min/avg/max/std-dev = 28.155/32.273/36.392/4.119 ms