revers don't works

[ringoid]

my configuration
ifconfig sit0 up
ifconfig sit0 inet6 tunnel ::216.66.80.30
ifconfig sit1 up
ifconfig sit1 inet6 add 2001:0470:1f0a:41c::2/64
route -A inet6 add ::/0 dev sit1

Non-authoritative answer:
2.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.c.1.4.0.a.0.f.1.0.7.4.0.1.0.0.2.ip6.arpa       name = ringoid-pt.tunnel.tserv6.fra1.ipv6.he.net.

Authoritative answers can be found from:
0.7.4.0.1.0.0.2.ip6.arpa        nameserver = ns1.ipv6.he.net.
0.7.4.0.1.0.0.2.ip6.arpa        nameserver = ns2.ipv6.he.net.
ns1.ipv6.he.net internet address = 64.71.188.2
ns2.ipv6.he.net internet address = 64.71.189.2

i was point to ns1.afraid.org ns2.afraid.org ns3.afraid.org but that don't work :-S what is the problem?

[broquea]

We don't delegate rDNS for the tunnel's point to point allocation, only the routed /64 and /48 allocations. The rDNS page that you enter nameserver information states this quite clearly:

"Also please note that this is for delegation of reverse DNS for the netblocks listed below, your routed /64 and /48. The Point to Point /64 reverse DNS is never delegated."

[snarked]

Your reverse zone (for a /64) should be:

c.1.4.0.b.0.f.1.0.7.4.0.1.0.0.2.ip6.arpa
          ^
Your /64 subnet allocation is:  2001:0470:1f0b:41c::/64
(The third quad's value is +1 from your tunnel endpoint's /64).