Missing Extended DNS error code

[mtillberg]

Proposed changes

• https://developers.cloudflare.com/1.1.1.1/infrastructure/extended-dns-error-codes/

Subject Matter

EDE Code 18

Content Location

Placed in the table or error codes

Additional information

I run my own primary nameserver, and I'm having issues with cloudflare reaching my DNS server. In the responses, I'm seeing occasional "EDE: 18 (Prohibited)" in the responses, usually alongside a EDE: 23 (Network Error) timeout. I can verify the packets are not being received on my end, so the timeout is reasonable. However, I can't tell if the Prohibited code is coming from Cloudflare refusing to send the request, or if it's from my ISP refusing the packet. My secondary DNS is at a third party, so the DNS request eventually gets handled. It would be good to know in the documentation potential causes for the EDE:18 errors.

$ dig @1.1.1.1 inv.kyossystems.com

; <<>> DiG 9.18.28-1~deb12u2-Debian <<>> @1.1.1.1 inv.kyossystems.com
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 28241
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1232
; EDE: 18 (Prohibited)
; EDE: 23 (Network Error): (72.65.106.158:53 timed out for inv.kyossystems.com A)