[dns-operations] trafficmanager.net problem affects download.microsoft.com

Mon Mar 31 15:04:37 UTC 2025

Am Mon, Mar 31, 2025 at 04:46:08PM +0200 schrieb Daniel Stirnimann via dns-operations:
> The authoritative name servers for trafficmanager.net respond differently
> depending on whether the query is made over IPv4 or IPv6.
> When queried over IPv4, I consistently receive the correct CNAME pointing to
> main.dl.ms.akadns.net.
> 
> However, when queried over IPv6, the response is always "No Data."

I can confirm this from our point of view as well. Had a encounter with an
unhappy customer a few hours ago who blamed our resolvers..

Quick fix for us was null-routing these 4 for IPv6 adresses:

2603:1061:0:F00::F0/128
2620:1EC:8EC:F00::F0/128
2620:1EC:BDA:F00::F0/128
2A01:111:4000:F00::F0/128