forward相关域名到2001:470:20::2即可
$ dig @2001:470:20::2 docs.google.com AAAA
; <<>> DiG 9.7.1 <<>> @2001:470:20::2 docs.google.com AAAA
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 23954
;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;docs.google.com. IN AAAA
;; ANSWER SECTION:
docs.google.com. 66510 IN CNAME writely.l.google.com.
writely.l.google.com. 100 IN AAAA 2001:4860:8011::64
;; Query time: 307 msec
;; SERVER: 2001:470:20::2#53(2001:470:20::2)
;; WHEN: Tue Dec 7 23:17:57 2010
;; MSG SIZE rcvd: 85
$ dig @2001:470:20::2 docs.google.com AAAA
; <<>> DiG 9.7.1 <<>> @2001:470:20::2 docs.google.com AAAA
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 23954
;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;docs.google.com. IN AAAA
;; ANSWER SECTION:
docs.google.com. 66510 IN CNAME writely.l.google.com.
writely.l.google.com. 100 IN AAAA 2001:4860:8011::64
;; Query time: 307 msec
;; SERVER: 2001:470:20::2#53(2001:470:20::2)
;; WHEN: Tue Dec 7 23:17:57 2010
;; MSG SIZE rcvd: 85