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| DNS: Windows Server 2008 R2 DNS fails on some queries |
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Problem:
We had a strange issue where commonly used hostnames (such as www.microsoft.com) would fail but others (such as www.google.com) would work.
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Solution:Investigating the issue, we saw that large answers would fail consistently while small ones worked.
www.microsoft.com. 1750 IN CNAME toggle.www.ms.akadns.net.
toggle.www.ms.akadns.net. 229 IN CNAME g.www.ms.akadns.net.
g.www.ms.akadns.net. 229 IN CNAME lb1.www.ms.akadns.net.
lb1.www.ms.akadns.net. 229 IN A 65.55.21.250
www.google.com. 86228 IN CNAME www.l.google.com.
www.l.google.com. 100 IN A 74.125.79.99
www.l.google.com. 100 IN A 74.125.79.104
www.l.google.com. 100 IN A 74.125.79.147
Noticing the difference in response sizes we came across the dnscmd 'AddressAnswerLimit' setting: http://technet.microsoft.com/en-us/library/cc940770.aspx
From the command line, type 'dnscmd /Config /AddressAnswerLimit 0'
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