johnjiang85

可以返回任意的记录结果、nxdomain 、servfail 等，但是最好别直接丢弃，部分网络库和客户端工具要等待 ptr 请求返回才会进行下一步处理，比如部分版本的 ping 、tcpdump 等，如果直接丢包 ptr 请求，会导致工具卡顿，部分工具可以通过指定-n 或者其他类似参数跳过该步骤，但是不能保证所有网络库都能方便的跳过 ptr 请求。

@Nyarime 具体要看对应产品的规划，可能在几个月左右吧

162.14.21.178 和 162.14.21.56 是最早的 doh 、dot 测试 IP ，不建议再继续使用，也只有海外访问这两个 IP 才会走海外递归，国内访问则依然走国内递归。
预计短期内将会下线这两个测试 IP ，后续都会替换为 1.12.12.12 和 120.53.53.53 ，当前国内已经替换，海外的替换会在海外优化完 1.12.12.12 和 120.53.53.53 的递归之后进行替换。

他们掌握的 IP 可能比我们更全，毕竟我们不是搞安全的。

@microluo061 有问题的 IP 其实很多，只公告了很少一部分，更多的 IP 也可以参考这个吧： https://mp.weixin.qq.com/s/6r4KxS3rtj6k1T4yCNV2Dw

@microluo061 暂时恢复了，就先下掉了，但是隐患还是存在的。

@bclerdx 可以通过全球 ping 找到。119.29.29.29 目前应该是北京、上海、广州、香港、新加坡、孟买、硅谷、法兰克福

@biglee0304 和 dnspod 没啥关系，应该是有个阿里云和华为云的租户，租用了阿里和华为的资源搭建了递归 dns ；然后不知道通过什么手段修改了用户路由器上的 dns ；然后这个 dns 经常解析各种域名有问题。

@52acca 从成都的 2402:4e00:1701:c000::1 测试 2402:4e00::，基本都是没有缓存，总体在正常范围内吧，应该主要还是用 ipv6 的太少了，缓存命中率太低的原因，且没有支持乐观 dns

```

[root@blog ~]# dig @2402:4e00:0::2ae4:2e8d www.lovelyping.com

; <<>> DiG 9.18.0 <<>> @2402:4e00:0::2ae4:2e8d www.lovelyping.com
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 23442
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1232
; COOKIE: d5dd7fc35a32c667 (echoed)
;; QUESTION SECTION:
;www.lovelyping.com. IN A

;; ANSWER SECTION:
www.lovelyping.com. 600 IN A 42.193.40.3

;; Query time: 102 msec
;; SERVER: 2402:4e00::2ae4:2e8d#53(2402:4e00:0::2ae4:2e8d) (UDP)
;; WHEN: Tue Aug 06 14:01:42 CST 2024
;; MSG SIZE rcvd: 75

[root@blog ~]# dig @2402:4e00:0::2ae4:2e8d www.qq.com

; <<>> DiG 9.18.0 <<>> @2402:4e00:0::2ae4:2e8d www.qq.com
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 42918
;; flags: qr rd ra; QUERY: 1, ANSWER: 3, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1232
; COOKIE: 8ce1025a22679f2c (echoed)
;; QUESTION SECTION:
;www.qq.com. IN A

;; ANSWER SECTION:
www.qq.com. 300 IN CNAME ins-r23tsuuf.ias.tencent-cloud.net.
ins-r23tsuuf.ias.tencent-cloud.net. 120 IN A 109.244.211.81
ins-r23tsuuf.ias.tencent-cloud.net. 120 IN A 109.244.211.100

;; Query time: 174 msec
;; SERVER: 2402:4e00::2ae4:2e8d#53(2402:4e00:0::2ae4:2e8d) (UDP)
;; WHEN: Tue Aug 06 14:01:49 CST 2024
;; MSG SIZE rcvd: 131

[root@blog ~]# dig @2402:4e00:0::2ae4:2e8d www.baidu.com

; <<>> DiG 9.18.0 <<>> @2402:4e00:0::2ae4:2e8d www.baidu.com
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 1396
;; flags: qr rd ra; QUERY: 1, ANSWER: 3, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1232
; COOKIE: 672f6cf8ff8c1704 (echoed)
;; QUESTION SECTION:
;www.baidu.com. IN A

;; ANSWER SECTION:
www.baidu.com. 1200 IN CNAME www.a.shifen.com.
www.a.shifen.com. 120 IN A 183.2.172.42
www.a.shifen.com. 120 IN A 183.2.172.185

;; Query time: 137 msec
;; SERVER: 2402:4e00::2ae4:2e8d#53(2402:4e00:0::2ae4:2e8d) (UDP)
;; WHEN: Tue Aug 06 14:01:55 CST 2024
;; MSG SIZE rcvd: 113

[root@blog ~]# dig @2402:4e00:0::2ae4:2e8d www.sina.com.cn

; <<>> DiG 9.18.0 <<>> @2402:4e00:0::2ae4:2e8d www.sina.com.cn
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 5085
;; flags: qr rd ra; QUERY: 1, ANSWER: 10, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1232
; COOKIE: 1bd50e8d1afefdcc (echoed)
;; QUESTION SECTION:
;www.sina.com.cn. IN A

;; ANSWER SECTION:
www.sina.com.cn. 60 IN CNAME spool.grid.sinaedge.com.
spool.grid.sinaedge.com. 60 IN CNAME ww1.sinaimg.cn.w.alikunlun.com.
ww1.sinaimg.cn.w.alikunlun.com. 60 IN A 110.185.116.236
ww1.sinaimg.cn.w.alikunlun.com. 60 IN A 110.185.116.231
ww1.sinaimg.cn.w.alikunlun.com. 60 IN A 110.185.116.232
ww1.sinaimg.cn.w.alikunlun.com. 60 IN A 110.185.116.229
ww1.sinaimg.cn.w.alikunlun.com. 60 IN A 110.185.116.230
ww1.sinaimg.cn.w.alikunlun.com. 60 IN A 110.185.116.233
ww1.sinaimg.cn.w.alikunlun.com. 60 IN A 110.185.116.234
ww1.sinaimg.cn.w.alikunlun.com. 60 IN A 110.185.116.235

;; Query time: 137 msec
;; SERVER: 2402:4e00::2ae4:2e8d#53(2402:4e00:0::2ae4:2e8d) (UDP)
;; WHEN: Tue Aug 06 14:02:02 CST 2024
;; MSG SIZE rcvd: 262

[root@blog ~]# dig @2402:4e00:0::2ae4:2e8d www.taobao.com

; <<>> DiG 9.18.0 <<>> @2402:4e00:0::2ae4:2e8d www.taobao.com
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 19397
;; flags: qr rd ra; QUERY: 1, ANSWER: 3, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1232
; COOKIE: 2c2d03db44bbdec6 (echoed)
;; QUESTION SECTION:
;www.taobao.com. IN A

;; ANSWER SECTION:
www.taobao.com. 579 IN CNAME www.taobao.com.danuoyi.tbcache.com.
www.taobao.com.danuoyi.tbcache.com. 60 IN A 163.177.180.107
www.taobao.com.danuoyi.tbcache.com. 60 IN A 163.177.180.108

;; Query time: 33 msec
;; SERVER: 2402:4e00::2ae4:2e8d#53(2402:4e00:0::2ae4:2e8d) (UDP)
;; WHEN: Tue Aug 06 14:02:12 CST 2024
;; MSG SIZE rcvd: 132

[root@blog ~]# dig @2402:4e00:0::2ae4:2e8d www.jd.com

; <<>> DiG 9.18.0 <<>> @2402:4e00:0::2ae4:2e8d www.jd.com
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 63704
;; flags: qr rd ra; QUERY: 1, ANSWER: 4, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1232
; COOKIE: 8e1a619943fb5cdc (echoed)
;; QUESTION SECTION:
;www.jd.com. IN A

;; ANSWER SECTION:
www.jd.com. 120 IN CNAME www.jd.com.gslb.qianxun.com.
www.jd.com.gslb.qianxun.com. 60 IN CNAME www.jd.com.s.galileo.jcloud-cdn.com.
www.jd.com.s.galileo.jcloud-cdn.com. 60 IN CNAME wwwv6.jcloudimg.com.
wwwv6.jcloudimg.com. 60 IN A 117.72.225.3

;; Query time: 370 msec
;; SERVER: 2402:4e00::2ae4:2e8d#53(2402:4e00:0::2ae4:2e8d) (UDP)
;; WHEN: Tue Aug 06 14:02:16 CST 2024
;; MSG SIZE rcvd: 181

[root@blog ~]# dig @2402:4e00:0::2ae4:2e8d www.pinduoduo.com

; <<>> DiG 9.18.0 <<>> @2402:4e00:0::2ae4:2e8d www.pinduoduo.com
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 23905
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1232
; COOKIE: 5c77ebe23d32511f (echoed)
;; QUESTION SECTION:
;www.pinduoduo.com. IN A

;; ANSWER SECTION:
www.pinduoduo.com. 60 IN A 150.158.224.195

;; Query time: 70 msec
;; SERVER: 2402:4e00::2ae4:2e8d#53(2402:4e00:0::2ae4:2e8d) (UDP)
;; WHEN: Tue Aug 06 14:02:27 CST 2024
;; MSG SIZE rcvd: 74
```