How to do DNS lookup in a Windows Azure web role?

StackOverflow https://stackoverflow.com/questions/8085635

  •  26-02-2021
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Question

I download DnDNS from http://dndns.codeplex.com/ and get it work at local IIS.

sample code:

request.Resolve("8.8.8.8", domain_a_string, NsType.MX, NsClass.INET, ProtocolType.Udp, null);

but on Windows Azure, not work, it says cannot connect to the DNS server, no response (or dropped)

Then, I tried 4.2.2.4 and plenty other public DNS server, none work.

Does anyone here have a working code or other DNS lookup solution for Azure?

Was it helpful?

Solution

I believe DNS works via UDP, and in Windows Azure, UDP traffic isn't routed. You'll need to use the DNS server inside Windows Azure. If there's a way with that library to just use the default DNS server Windows is configured to use, that should work. If not, you might derive some inspiration from http://smarxrole.codeplex.com/SourceControl/changeset/view/3accd48815c3, which is a PowerShell script that gets the right DNS server in Windows Azure.

OTHER TIPS

Check out StatDNS which allows you to perform DNS queries over HTTP, and to get reverse PTR records for both IPv4 and IPv6 addresses @ https://github.com/ghuntley/statdns

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