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The DNS server encountered a bad packet from

Posted on 2011-02-17
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Last Modified: 2012-05-11
Two days ago we started getting these errors on 2 DNS servers (WIndows 2008 R2)
They all come from about 6-7 different Akamai DNS servers. Im pretty sure the problem is not on our servers but Akamai support is giving me some bogus solution about changing our DNS resolution from UDP to TCP. This may help, if I knew how to do it, but it does not solve the problem why Akamai is sending us bad packets for 2 out of the 10 sites we host there.

Questions
1. Akamai tech is asking me to enable the TCP based resolution, I am not sure how.
He doesnt even know what it means, hes just reading from their KB articles.
"Unfortunately, my understanding of win 2k8 is very limited...
You may want to check it with windows helpline..."

2. Are there any other things I can troubleshoot from my side to prove its not my servers having issues?

Thanks
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Question by:bluerealm604
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Expert Comment

by:Darius Ghassem
ID: 34918182
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Accepted Solution

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hyperoxic earned 125 total points
ID: 35130174
Your Windows Server 2008 R2 DNS server does recursive lookups using EDNS.  Akami and others don't yet support this functionality, and so in the meantime you'll need to disable EDNS Probing until they do, read: a few years.

Disable EDNS from the cmd prompt (no DNS restart required):

dnscmd /config /EnableEDNSProbes 0

Disable EDNS from the Registry (service restart required):

1. Navigate to HKLM\SYSTEM\CurrentControlSet\services\DNS\Parameters
2. Create a DWORD called EnableEDNSProbes and set it to 0
3. Restart the DNS Server service
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Author Closing Comment

by:bluerealm604
ID: 35158745
Yes disabling EDNS did stop the errors but it doesnt explain why they were happening on only 2 out of 10 sites we host with Akamai.
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