Linux 下如何优先使用 IPv6 DNS 呢?

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This topic created in 4172 days ago, the information mentioned may be changed or developed.

想让Ubuntu像Windows 8.1那样优先使用IPv6 DNS和优先查询AAAA记录. 但是发现Ubuntu还是会优先使用IPv4 DNS来查询.

结果是被GFW抢答.
$ dig @74.82.42.42 youtube.com AAAA

;; QUESTION SECTION:
;youtube.com. IN AAAA

;; ANSWER SECTION:
youtube.com. 3556 IN A 37.61.54.158

;; Query time: 73 msec
;; SERVER: 74.82.42.42#53(74.82.42.42)

正确的解析结果应该是:
$ dig @74.82.42.42 youtube.com AAAA

;; QUESTION SECTION:
;youtube.com. IN AAAA

;; ANSWER SECTION:
youtube.com. 10 IN AAAA 2607:f8b0:4001:c05::88

;; Query time: 33 msec
;; SERVER: 74.82.42.42#53(74.82.42.42)

在网上查了半天都没有找到什么好方法. IPv6用的是HE的6to4, 想让Ubuntu先用IPv6来解析, 我现在的设置是
/etc/gai.conf

label ::1/128 0
label ::/0 1
#label 2002::/16 2
label ::ffff:0:0/96 2
label fec0::/10 3
label fc00::/7 4
label 2001:0::/32 5
label ::/96 6

precedence ::1/128 50
precedence ::/0 40
precedence 2002::/16 30
precedence ::/96 20
precedence ::ffff:0:0/96 10

/etc/resolv.conf

nameserver 2001:4860:4860::8844
nameserver 2001:4860:4860::8888
nameserver 209.244.0.3

Supplement 1 · Jan 6, 2015

终于用了一个比较粗暴的方法解决了. GUI那个Network Manager好像有问题, 不认IPv6 DNS服务器, 导致所有流量都往IPv4 DNS跑了.

在/etc/resolvconf/resolv.conf.d/head 这里写入想用的DNS.

nameserver 2001:470:20::2
nameserver 2620:0:ccc::2
nameserver 2001:4860:4860::8888

然后运行$ sudo resolvconf -u
再 $cat /etc/resolv.conf 看看那些IPv6的DNS写进入没有.

$ sudo service network-manager restart
$ dig youtube.com

看输出底部是不是
;; Query time: 289 msec
;; SERVER: 2001:470:20::2#53(2001:470:20::2)
这样的, 如果是就OK了.

现在应该能解析出来IPv6地址了.

precedence

Label

nameserver

8 replies • 2015-01-06 16:54:14 +08:00