突然 dig +nocmd pop3.pauperis.org aaaa +noall +answer 什麼也沒返回

該命令dig +nocmd pop3.pauperis.org aaaa +noall +answer在我的筆記型電腦中返回以下內容：

pop3.pauperis.org.  3111    IN  CNAME   pauperis.org.
pauperis.org.       3111    IN  AAAA    2001:41d0:1:8ade::1

但是我的伺服器上的相同命令，突然，在沒有明顯的配置更改後什麼都不返回：

# dig +nocmd pop3.pauperis.org aaaa +noall +answer
#

這是我伺服器上的響應，但有+trace選項：

dig +nocmd pop3.pauperis.org aaaa +noall +answer +trace
.           44679   IN  NS  e.root-servers.net.
.           44679   IN  NS  m.root-servers.net.
.           44679   IN  NS  l.root-servers.net.
.           44679   IN  NS  b.root-servers.net.
.           44679   IN  NS  g.root-servers.net.
.           44679   IN  NS  i.root-servers.net.
.           44679   IN  NS  a.root-servers.net.
.           44679   IN  NS  d.root-servers.net.
.           44679   IN  NS  h.root-servers.net.
.           44679   IN  NS  f.root-servers.net.
.           44679   IN  NS  j.root-servers.net.
.           44679   IN  NS  k.root-servers.net.
.           44679   IN  NS  c.root-servers.net.
.           44679   IN  RRSIG   NS 8 0 518400 20220316050000 20220303040000 9799 . WHZ//zKcRc0aFze+haFiC5a0GwaCwCsopDkMLzMZrOTTvejeb96R01h+ 2mlnsd4qivrbop0a7fBz+Vs/m+YVOPku+vCO/fnZ+NW/KgrtXpHoPopE WayXrfwtEC+Iu/G7gD1bePIhXqeEMSYlfLD84g7ezASeXc4q3Yrfw3+s SnKkG/vwlZ3IFcSw90bqyYoV597fRLZYdEoUzDjp9onU/NcwqmWJ6muV Ms2IO7kHTaUfMO7z6mgf5PGC2ylTywz+4WZLFd6t8QvZypEMGFwPSxJ2 W86Sdh2QJSDznW3V5CFW3tW+59ZzKsJHuGlHTwqem+egipZMXoMW9y+F 08ZVlg==
;; Received 1137 bytes from 127.0.0.1#53(127.0.0.1) in 0 ms

org.            172800  IN  NS  b2.org.afilias-nst.org.
org.            172800  IN  NS  a2.org.afilias-nst.info.
org.            172800  IN  NS  d0.org.afilias-nst.org.
org.            172800  IN  NS  a0.org.afilias-nst.info.
org.            172800  IN  NS  b0.org.afilias-nst.org.
org.            172800  IN  NS  c0.org.afilias-nst.info.
org.            86400   IN  DS  26974 8 2 4FEDE294C53F438A158C41D39489CD78A86BEB0D8A0AEAFF14745C0D 16E1DE32
org.            86400   IN  RRSIG   DS 8 1 86400 20220321170000 20220308160000 9799 . m3lulShGydigMRJiRixpAFeO9YBBkntgr2Gk42/sts9JLeGVavWmrAyd 5uFDMPf+DqWjgz65BCR1kipEpJAbETmqiwf17rrk9yDIXYGDfrdv04tg w5+4LjANeRzCqr9CH2FFokRt5cl2AdCSn2kNonndSM72Zfhots5ggn8G nTXyt3Aj3Hg4xagS1ZqPhodM15r95NVWw4ozPywSt76vI/oOgEBF6ckw Hz9AEg5i4MdSoLTwiT9fLE51KfiJQO6Xfp8ZANUFtwrydLb0pqJtXMbC BoJnhXjyjWzlOA5/ze5PR3nCh7tbtbTdxdowiB2Jrc3j5Cirfw7dAske TAjiiQ==
;; Received 817 bytes from 192.36.148.17#53(i.root-servers.net) in 3 ms

pauperis.org.       86400   IN  NS  ns111.ovh.net.
pauperis.org.       86400   IN  NS  dns111.ovh.net.
pauperis.org.       86400   IN  DS  18975 7 2 9CE6DA2D7883298D589BDBD5DFD29BB76FB24329C12B453A055F06F6 4EEC0C0C
pauperis.org.       86400   IN  RRSIG   DS 8 2 86400 20220322152315 20220301142315 30573 org. mE8EiULvqr8ZBCDb6rQnXHlxVoZtaTzbLjMtRi9w2jyGYYcKbX0m8N7R +b4NmqrsiQa7nz3DBbDDwt8IbXZfEIqVmGLJrx7Gp+uMDECa54mz06kG Xz1LWb6j/B6CA+1+fa+MyDBJt7A6inBLZQix8Fr9xkWRYznsQqyeeHnW YYo=
;; Received 305 bytes from 199.19.57.1#53(d0.org.afilias-nst.org) in 83 ms

pop3.pauperis.org.  3600    IN  CNAME   pauperis.org.
pop3.pauperis.org.  3600    IN  RRSIG   CNAME 8 3 3600 20220403112323 20220304112323 37698 pauperis.org. OhXaHFQ1xfLU2T3zjUIBpKsW6k62NZVlnCf4aQKUhbtDcVTGbWDNbwo7 MkpsDh2zpwG3vIqzqdw9t0Uuq7A1U+TDH0SetnBDVvlR1dNNZRbEiWBd C1dJiNuItE37iDNexAebRBvSnM/9hfjDUwDaX7Q78iQS836gxkTSV/g7 Bys=
pauperis.org.       3600    IN  AAAA    2001:41d0:1:8ade::1
pauperis.org.       3600    IN  RRSIG   AAAA 8 2 3600 20220403112323 20220304112323 37698 pauperis.org. dZP/Vxls3u1x8lMQ4A4NULX/UMrf7M+YkBNim4pJ/O9qkHCHn3N19Fku JciU5LCsWd4dw856ejt6CLBDy1c5RSADfrP+q3O3x9kstsgrH+Wf0pP8 cU2y/mTJRSQWPp+6jBUITshXJvcuV+XFpHeA931570XelUGN7ZuEStzD COc=
;; Received 432 bytes from 2001:41d0:1:4a9b::1#53(dns111.ovh.net) in 3 ms

有人能告訴我可能出了什麼問題嗎？

非常感謝你在高級:)

請參閱https://dnsviz.net/d/pop3.pauperis.org/YifJYQ/dnssec/DS此名稱具有巨大的 DNSSEC 錯誤配置（父 aka 註冊中心的記錄 不匹配的典型案例，以及在DNSKEY子節點中找到的記錄）。這需要在整個域正常工作之前解決。

通過驗證解析器（因此使用 DNSSEC 驗證）比較正常答案，然後明確禁止 DNSSEC 驗證，也很容易發現：

$ dig pop3.pauperis.org @9.9.9.9

; <<>> DiG 9.18.0 <<>> pop3.pauperis.org @9.9.9.9
;; global options: +cmd
;; Sending:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 39260
;; flags: rd ad; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
; COOKIE: c145784edda54901
;; QUESTION SECTION:
;pop3.pauperis.org. IN A

;; QUERY SIZE: 58

;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 39260
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 512
; EDE: 9 (DNSKEY Missing)

SERVFAIL可以是很多東西但是 DNSSEC 致命錯誤總是SERVFAIL錯誤程式碼，然後在傳遞時注意擴展 DNS 錯誤：DNSKEY Missing。

然後同樣繞過 DNSSEC（感謝 dig+cd標誌）：

$ dig pop3.pauperis.org @9.9.9.9 +cd

; <<>> DiG 9.18.0 <<>> pop3.pauperis.org @9.9.9.9 +cd
;; global options: +cmd
;; Sending:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 1480
;; flags: rd ad cd; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
; COOKIE: c028e114f2c210f8
;; QUESTION SECTION:
;pop3.pauperis.org. IN A

;; QUERY SIZE: 58

;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 1480
;; flags: qr rd ra cd; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1232
;; QUESTION SECTION:
;pop3.pauperis.org. IN A

;; ANSWER SECTION:
pop3.pauperis.org.  1h IN CNAME pauperis.org.
pauperis.org.       1h IN A 91.121.85.222

現在你得到NOERROR. 刪除 DNSSEC 驗證的簡單事實可以很好地證明該錯誤與 DNSSEC 相關。

引用自：https://serverfault.com/questions/1095693