Not seeing an issue in Fremont, where your tunnel is:
~# dig aaaa www.google.com @74.82.42.42
; <<>> DiG 9.7.1-P2 <<>> aaaa www.google.com @74.82.42.42
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 14872
;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;www.google.com. IN AAAA
;; ANSWER SECTION:
www.google.com. 60400 IN CNAME www.l.google.com.
www.l.google.com. 24 IN AAAA 2001:4860:b006::93
;; Query time: 0 msec
;; SERVER: 74.82.42.42#53(74.82.42.42)
;; WHEN: Fri May 13 12:20:38 2011
;; MSG SIZE rcvd: 80
~# dig aaaa www.google.com @2001:470:20::2
; <<>> DiG 9.7.1-P2 <<>> aaaa www.google.com @2001:470:20::2
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 28129
;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;www.google.com. IN AAAA
;; ANSWER SECTION:
www.google.com. 60359 IN CNAME www.l.google.com.
www.l.google.com. 283 IN AAAA 2001:4860:b006::63
;; Query time: 5 msec
;; SERVER: 2001:470:20::2#53(2001:470:20::2)
;; WHEN: Fri May 13 12:21:19 2011
;; MSG SIZE rcvd: 80
~# dig a www.google.com @74.82.42.42
; <<>> DiG 9.7.1-P2 <<>> a www.google.com @74.82.42.42
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 63763
;; flags: qr rd ra; QUERY: 1, ANSWER: 6, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;www.google.com. IN A
;; ANSWER SECTION:
www.google.com. 60275 IN CNAME www.l.google.com.
www.l.google.com. 121 IN A 74.125.224.83
www.l.google.com. 121 IN A 74.125.224.81
www.l.google.com. 121 IN A 74.125.224.82
www.l.google.com. 121 IN A 74.125.224.80
www.l.google.com. 121 IN A 74.125.224.84
;; Query time: 0 msec
;; SERVER: 74.82.42.42#53(74.82.42.42)
;; WHEN: Fri May 13 12:22:43 2011
;; MSG SIZE rcvd: 132
~# dig a www.google.com @2001:470:20::2
; <<>> DiG 9.7.1-P2 <<>> a www.google.com @2001:470:20::2
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 54105
;; flags: qr rd ra; QUERY: 1, ANSWER: 6, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;www.google.com. IN A
;; ANSWER SECTION:
www.google.com. 60266 IN CNAME www.l.google.com.
www.l.google.com. 112 IN A 74.125.224.83
www.l.google.com. 112 IN A 74.125.224.81
www.l.google.com. 112 IN A 74.125.224.82
www.l.google.com. 112 IN A 74.125.224.80
www.l.google.com. 112 IN A 74.125.224.84
;; Query time: 5 msec
;; SERVER: 2001:470:20::2#53(2001:470:20::2)
;; WHEN: Fri May 13 12:22:52 2011
;; MSG SIZE rcvd: 132