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https://support.microsoft.com/en-us/help/832223/some-dns-name-queries-are-unsuccessful-after-you-deploy-a-windows-base
Mar 29, 2017 · Describes an issue that occurs because of the Extension Mechanisms for DNS (EDNS0) functionality that is supported in Windows Server DNS. Provides a resolution and workaround. Some DNS name queries are unsuccessful after you deploy a Windows-based DNS server
https://social.technet.microsoft.com/forums/windowsserver/en-US/108bea5a-b35f-4c0c-8a5e-687c929510b5/how-to-check-for-edns0-support-and-troubleshoot-it
Mar 16, 2012 · the above tells nslookup to run the EDNS0 test we already saw, but using the DNS resolver sitting at 4.2.2.6 instead of whatever locally configured DNS resolver; if the test will fail or return "no EDNS0" then, given that the resolver at 4.2.2.6 DOES support EDNS0, it most probably means that some of the hardware along the path is playing ...
https://en.wikipedia.org/wiki/Extension_mechanisms_for_DNS
Extension mechanisms for DNS (EDNS) is a specification for expanding the size of several parameters of the Domain Name System (DNS) protocol which had size restrictions that the Internet engineering community deemed too limited for increasing functionality of the protocol. The first set of extensions was published in 1999 by the Internet Engineering Task Force as RFC 2671, also known as EDNS0 ...
https://kb.isc.org/docs/aa-01350
Sep 20, 2018 · The EDNS fallback code was re-worked in BIND 9.10 to make it more resilient and reliable when: Encountering new authoritative servers that have not been queried before and for whom the capabilities/support for EDNS and large buffer sizes by both the server and the network path between it and the resolver is unknown.
https://social.technet.microsoft.com/Forums/en-US/4aea5fd1-4a79-4b8e-9f01-bc7d47d15da9/windows-server-2008-issue-with-dns-queries-that-contain-edns0-section
Dec 05, 2016 · >>From my POV, it appears more that it's the Windows Server itself that does not support EDNS0. EDNS0 was support by windows server 2008, and it is enabled by default in windows server 2008. Best Regards. ... If yes does it do the correct thing if the EDNS0 record has an unknown type. The protocol says the server should ignore the record, but ...
https://www.ibm.com/support/knowledgecenter/SSLTBW_2.1.0/com.ibm.zos.v2r1.hald001/intrareout.htm
The resolver might believe that the name server supports EDNS0 (EDNS0 Support = Up-level), that the name server does not support EDNS0 (EDNS0 Support = Down-level), or that the capability of the name server is undetermined (EDNS0 Support = Unknown).
https://github.com/coredns/coredns/issues/2328
Nov 20, 2018 · This domain is going to work after the 2019 DNS flag day BUT it does not support the latest DNS standards. As a consequence this domain cannot support the latest security features and might be an easier target for network attackers than necessary, and might face other issues later on.
https://blogs.msmvps.com/acefekay/2010/10/11/edns0-extension-mechanisms-for-dns/
Oct 11, 2010 · Windows 2003 and newer operating systems support EDNS0 Extension mechanisms for DNS). The first set of EDNS0 extensions were published in 1999 by the Internet Engineering Task Force as RFC 2671. EDNS0 supports a UDP query response larger than 512 bytes. Using the legacy method, UDP was used only as long as the DNS query was under 512 bytes.
https://morgansimonsen.com/2010/04/20/windows-and-extension-mechanisms-for-dns-edns/
RFC 2671 defines the Extension mechanisms for DNS (EDNS), or EDNS0 as it is also known. EDNS is a specification for expanding the size of several parameters of the Domain Name System (DNS) protocol. More info about EDNS here. As of Windows Server 2008 R2, the Windows DNS service will use EDNS in its queries to other DNS servers.
https://github.com/kamailio/kamailio/issues/2087
Oct 01, 2019 · We are running Kamailio in a Microsoft Azure VM. Azure started adding EDNS0 support - in the form of OPT pseudo-records at the end of replies - a few weeks ago and since then we see a lot of ERROR entries in Kamailio log. These do however have no function impact. From what I can see they are simply not handled in core/resolv.c (EDNS0 is type 41).
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