I can't get to the HE IPv4 Anycast DNS, but can get to the IPv6 site. I don't know if HE started blocking outside access to their v4 address? Considering most do not route the IPv4 across the tunnel, they take two paths.
mills@Dilbert:~> dig aaaa google.com @2001:470:20::2
; <<>> DiG 9.7.3 <<>> aaaa google.com @2001:470:20::2
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 7546
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;google.com. IN AAAA
;; ANSWER SECTION:
google.com. 190 IN AAAA 2001:4860:800c::67
;; Query time: 14 msec
;; SERVER: 2001:470:20::2#53(2001:470:20::2)
;; WHEN: Wed May 11 09:52:42 2011
;; MSG SIZE rcvd: 56
mills@Dilbert:~> dig aaaa google.com @74.82.42.42
; <<>> DiG 9.7.3 <<>> aaaa google.com @74.82.42.42
;; global options: +cmd
;; connection timed out; no servers could be reached
mills@Dilbert:~> ping 74.82.42.42
PING 74.82.42.42 (74.82.42.42) 56(84) bytes of data.
^C
--- 74.82.42.42 ping statistics ---
9 packets transmitted, 0 received, 100% packet loss, time 7995ms
mills@Dilbert:~> ping6 2001:470:20::2
PING 2001:470:20::2(2001:470:20::2) 56 data bytes
64 bytes from 2001:470:20::2: icmp_seq=1 ttl=63 time=16.6 ms
64 bytes from 2001:470:20::2: icmp_seq=2 ttl=63 time=17.4 ms
64 bytes from 2001:470:20::2: icmp_seq=3 ttl=63 time=15.3 ms
^C
--- 2001:470:20::2 ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 1999ms
rtt min/avg/max/mdev = 15.339/16.474/17.433/0.876 ms