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Entra: IPv6 Sign in logs from arm

Fabian 0 Reputation points
2026-02-13T19:58:55.08+00:00

Is it expected that ARM will use Unique Local Addresses (ULAs)? How should we deal with this? We use IP blocking, and releasing the entire IPv6 range would be too insecure for me.

Background, we are using an spn which has the permissions to manage/create an aks.

Microsoft Security | Microsoft Entra | Microsoft Entra ID
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  1. kagiyama yutaka 1,165 Reputation points
    2026-02-13T21:28:02.81+00:00

    ARM’s been leaking those v6 ULA hops for a while now, it’s just backend plumbing.

    you can’t really fence that stuff with IPs and the trick is lock the spn down with CA + tight roles, not the addr. chasing v6 blocks is… kinda a fool’s errand tbh.


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