阿里公共 DNS 的后端是不是有问题

[loukky]

最近用 adguard home 解析域名发现一半的时间会解析到国外的 CDN 节点上面，比如 jd 抖音的域名。
于是在远程 vps 上面测试了下。发现阿里公共 dns 有时候传递了 esc ，有时候又没有。导致一会儿是国内 CDN 节点，一会是国外 CDN 节点。
也找不到地方反馈一下，哎

[opc@instance-sjc2 ~]$ dig @223.5.5.5 txt o-o.myaddr.l.google.com +subnet=27.8.59.1/24

; <<>> DiG 9.11.4-P2-RedHat-9.11.4-26.P2.el7_9.16 <<>> @223.5.5.5 txt o-o.myaddr.l.google.com +subnet=27.8.59.1/24
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 21080
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
; CLIENT-SUBNET: 27.8.59.0/24/24
;; QUESTION SECTION:
;o-o.myaddr.l.google.com. IN TXT

;; ANSWER SECTION:
o-o.myaddr.l.google.com. 17 IN TXT "47.254.235.11"

;; Query time: 172 msec
;; SERVER: 223.5.5.5#53(223.5.5.5)
;; WHEN: Sat Mar 01 20:40:40 CST 2025
;; MSG SIZE rcvd: 89

[opc@instance-sjc2 ~]$ dig @223.5.5.5 txt o-o.myaddr.l.google.com +subnet=27.8.59.1/24

; <<>> DiG 9.11.4-P2-RedHat-9.11.4-26.P2.el7_9.16 <<>> @223.5.5.5 txt o-o.myaddr.l.google.com +subnet=27.8.59.1/24
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 51080
;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1408
; CLIENT-SUBNET: 27.8.59.0/24/24
;; QUESTION SECTION:
;o-o.myaddr.l.google.com. IN TXT

;; ANSWER SECTION:
o-o.myaddr.l.google.com. 44 IN TXT "47.254.235.11"
o-o.myaddr.l.google.com. 44 IN TXT "edns0-client-subnet 27.8.0.0/25"

;; Query time: 171 msec
;; SERVER: 223.5.5.5#53(223.5.5.5)
;; WHEN: Sat Mar 01 20:40:41 CST 2025
;; MSG SIZE rcvd: 133

[mytsing520]

经反馈，现已 fix

[loukky]

@mytsing520 感谢，简单测试了下，确实每次都能携带 esc 了

[flyqie]

@mytsing520 #1

有点好奇阿里的 dnsserver 主要是什么语言编写的，网络上似乎没有相关内容，感觉应该是 cpp 为主？