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From: James Bryan
Date: Tue, 11 Oct 2022 05:20:11 +0000
Message-ID: <CAPKJoo4XEQnft5jR11U14AwHtbeQC-5jZ42H2SZ5h86Cb2h8eA@mail.gmail.com>
Subject: [SurgeMail List] Possible dns bug
To: surgemail-list@netwin.co.nz
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There have random 'no mx/a record' on some domain even try to change new dns server
In log file "dnsx: truncated packet" it might be that surgemail ignores response UDP query that has over 512 bytes limit.
Modern dns is not actually limited to 512 bytes payload for UDP anymore.
Here is some responses on linux dig command with some of public dns servers
$dig
yahoo.com mx @
1.1.1.1; <<>> DiG 9.10.3-P4-Debian <<>>
yahoo.com mx @
1.1.1.1;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 9144
;; flags: qr rd ra; QUERY: 1, ANSWER: 3, AUTHORITY: 0, ADDITIONAL: 1
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1232 <---
;; QUESTION SECTION:
;
yahoo.com. IN MX
;; ANSWER SECTION:
yahoo.com. 631 IN MX 1
mta5.am0.yahoodns.net.
yahoo.com. 631 IN MX 1
mta6.am0.yahoodns.net.
------
---------
; EDNS: version: 0, flags:; udp: 1232
; EDNS: version: 0, flags:; udp: 4096
It show that it return more than 512 bytes