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 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 and > geo10.t-mobile.com incorrectly return NXDOMAIN when queried for NS > records for epdg.epc.geo.mnc260.mcc310.pub.3gppnetwork.org and > 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 Returning NXDOMAIN for > WiFi Calling > _______________________________________________ > dns-operations mailing list > [email protected] > https://lists.dns-oarc.net/mailman/listinfo/dns-operations >
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