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List:       nanog
Subject:    Microsoft have releases a fix for the misbehaviour of their DNS servers.
From:       Mark Andrews <marka () isc ! org>
Date:       2019-04-29 2:52:22
Message-ID: C49E7298-6A26-451D-997D-FD82048AB90D () isc ! org
[Download RAW message or body]

If you are using Microsoft for your DNS servers you really should update to
a version that includes this fix from March 19, 2019 monthly updates.

	• Addresses minor issues with unknown options (unknown OPT) in the
	  Extension Mechanisms for DNS (EDNS) for the Windows DNS Server role.

https://support.microsoft.com/en-nz/help/4489893/windows-8-1-update-kb4489893

Older versions have even more egregious misbehaviour, with really old versions
(pre-EDNS support) being flagged as dead by recursive servers as they do not
respond consistently to EDNS queries.  They respond a single time then do not
respond at all for a period of time.

Mark
-- 
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742              INTERNET: marka@isc.org

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