Looks like they have removed the IPv6 addresses.
% dig nameserver1.mc.duke.edu aaaa
;; BADCOOKIE, retrying.
; <<>> DiG 9.21.0-dev <<>> nameserver1.mc.duke.edu aaaa
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 51760
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 1
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1232
; COOKIE: c31ab4004b3f1bf30100000066ecc7400b8f7da8be92918a (good)
;; QUESTION SECTION:
;nameserver1.mc.duke.edu. IN AAAA
;; AUTHORITY SECTION:
mc.duke.edu. 3290 IN SOA nc1-bc-hm1.dhe.duke.edu. hostmaster.dhe.duke.edu.
635464169 1200 180 1209600 3600
;; Query time: 0 msec
;; SERVER: ::1#53(::1) (UDP)
;; WHEN: Fri Sep 20 10:52:16 AEST 2024
;; MSG SIZE rcvd: 142
% dig nameserver2.mc.duke.edu aaaa
;; BADCOOKIE, retrying.
; <<>> DiG 9.21.0-dev <<>> nameserver2.mc.duke.edu aaaa
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 19848
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 1
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1232
; COOKIE: 662d3c7183a5df740100000066ecc74855728ea060130e36 (good)
;; QUESTION SECTION:
;nameserver2.mc.duke.edu. IN AAAA
;; AUTHORITY SECTION:
mc.duke.edu. 3283 IN SOA nc1-bc-hm1.dhe.duke.edu. hostmaster.dhe.duke.edu.
635464169 1200 180 1209600 3600
;; Query time: 0 msec
;; SERVER: ::1#53(::1) (UDP)
;; WHEN: Fri Sep 20 10:52:24 AEST 2024
;; MSG SIZE rcvd: 142
%
> On 20 Sep 2024, at 02:59, Seth Mattinen via NANOG <nanog@nanog.org> wrote:
>
> Is there anyone from duke.edu on this list? I am having problems with IPv6 on
> one of their sub-delegations causing mail delays. Trying to go through the
> front door writes me off with "not our problem".
>
>
> dm.duke.edu. 21600 IN NS nameserver1.mc.duke.edu.
> dm.duke.edu. 21600 IN NS nameserver2.mc.duke.edu.
> ;; Received 135 bytes from 152.3.105.232#53(dns-auth-02.oit.duke.edu) in 76 ms
>
> nameserver1.mc.duke.edu has address 152.16.1.4
> nameserver1.mc.duke.edu has IPv6 address 2620:0:691:dc50::4
>
> nameserver2.mc.duke.edu has address 152.16.1.12
> nameserver2.mc.duke.edu has IPv6 address 2620:0:691:dc57::12
>
>
> Works on IPv4:
>
> ; <<>> DiG 9.10.3-P4-Debian <<>> MX dm.duke.edu @152.16.1.4
> ;; global options: +cmd
> ;; Got answer:
> ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 4622
> ;; flags: qr aa rd; QUERY: 1, ANSWER: 1, AUTHORITY: 2, ADDITIONAL: 1
> ;; WARNING: recursion requested but not available
>
> ;; OPT PSEUDOSECTION:
> ; EDNS: version: 0, flags:; udp: 1232
> ; OPT=15: 00 12 ("..")
> ;; QUESTION SECTION:
> ;dm.duke.edu. IN MX
>
> ;; ANSWER SECTION:
> dm.duke.edu. 3600 IN MX 10 mx.oit.duke.edu.
>
> ;; AUTHORITY SECTION:
> dm.duke.edu. 86400 IN NS nameserver1.mc.duke.edu.
> dm.duke.edu. 86400 IN NS nameserver2.mc.duke.edu.
>
> ;; Query time: 77 msec
> ;; SERVER: 152.16.1.4#53(152.16.1.4)
> ;; WHEN: Thu Sep 19 06:37:13 PDT 2024
> ;; MSG SIZE rcvd: 140
>
>
> ; <<>> DiG 9.10.3-P4-Debian <<>> MX dm.duke.edu @152.16.1.12
> ;; global options: +cmd
> ;; Got answer:
> ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 7136
> ;; flags: qr aa rd; QUERY: 1, ANSWER: 1, AUTHORITY: 2, ADDITIONAL: 1
> ;; WARNING: recursion requested but not available
>
> ;; OPT PSEUDOSECTION:
> ; EDNS: version: 0, flags:; udp: 1232
> ; OPT=15: 00 12 ("..")
> ;; QUESTION SECTION:
> ;dm.duke.edu. IN MX
>
> ;; ANSWER SECTION:
> dm.duke.edu. 3600 IN MX 10 mx.oit.duke.edu.
>
> ;; AUTHORITY SECTION:
> dm.duke.edu. 86400 IN NS nameserver2.mc.duke.edu.
> dm.duke.edu. 86400 IN NS nameserver1.mc.duke.edu.
>
> ;; Query time: 76 msec
> ;; SERVER: 152.16.1.12#53(152.16.1.12)
> ;; WHEN: Thu Sep 19 09:57:48 PDT 2024
> ;; MSG SIZE rcvd: 140
>
>
> Fails on IPv6:
>
> ; <<>> DiG 9.10.3-P4-Debian <<>> MX dm.duke.edu @2620:0:691:dc50::4
> ;; global options: +cmd
> ;; connection timed out; no servers could be reached
>
> ; <<>> DiG 9.10.3-P4-Debian <<>> MX dm.duke.edu @2620:0:691:dc57::12
> ;; global options: +cmd
> ;; connection timed out; no servers could be reached
>
>
>
> ~Seth
--
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742 INTERNET: ma...@isc.org
