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FWIW, we have `qname-minimization disabled;` in our config.
Using RPZ in BIND seems to make it do things differently, causing it to
surface problems like this more often than it would without RPZ. See
this comment about a similar issue:
https://gitlab.isc.org/isc-projects/bind9/-/issues/4787#note_470454
On 2025-11-19 00:49, Crist Clark wrote:
QNAME minimization. Their non-compliant load balancers pretending to
be authoritative servers give responses that break QNAME minimization.
On Tue, Nov 18, 2025 at 8:06 PM Richard Laager via dns-operations
<[email protected]> wrote:
---------- Forwarded message ----------
From: Richard Laager <[email protected]>
To: [email protected]
Cc:
Bcc:
Date: Tue, 18 Nov 2025 21:55:06 -0600
Subject: geo9/geo10.t-mobile.com <http://geo10.t-mobile.com>
Returning NXDOMAIN for WiFi Calling
Anyone have a good contact for T-Mobile authoritative DNS? I've
had no response from [email protected].
My customers are reporting that T-Mobile WiFi calling (sometimes)
does not work on our Internet service. This appears to be due to
DNS resolution failures.
The cause of the failures seems to be that geo9.t-mobile.com
<http://geo9.t-mobile.com> and geo10.t-mobile.com
<http://geo10.t-mobile.com> incorrectly return NXDOMAIN when
queried for NS records for
epdg.epc.geo.mnc260.mcc310.pub.3gppnetwork.org
<http://epdg.epc.geo.mnc260.mcc310.pub.3gppnetwork.org> and
epc.geo.mnc260.mcc310.pub.3gppnetwork.org
<http://epc.geo.mnc260.mcc310.pub.3gppnetwork.org>. Note that they
correctly return an answer when queried for A records. See also:
https://dnsviz.net/d/epdg.epc.mnc260.mcc310.pub.3gppnetwork.org/dnssec/
--
Richard
---------- Forwarded message ----------
From: Richard Laager via dns-operations <[email protected]>
To: [email protected]
Cc:
Bcc:
Date: Tue, 18 Nov 2025 21:55:06 -0600
Subject: [dns-operations] geo9/geo10.t-mobile.com
<http://geo10.t-mobile.com> Returning NXDOMAIN for WiFi Calling
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--
Richard
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