DNS Report
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http://www.dnsreport.com/ Fantastic site for trouble shooting DNS problem. Gives a simple PASS/FAIL/WARNING for all the possible DNS entries along with suggestion on how to set them up.
Scripted access to MS DNS
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http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dn...
This article describes how to use the DNS WMI Provider tool. It also includes scripts that show how a list of DNS provisioning requests collected over a morning of sales can be configured in a few seconds. The article uses the DNS WMI Provider tool, a Microsoft-provided script called Import.vbs, and an Excel file call Wwwimport.xls.
Dynamic DNS Webservice
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http://www.codeproject.com/webservices/ipmon.asp This collection of VS projects allows public DHCP address monitoring by a service on remote clients. When the IP address changes, it is reported to a web service, and then depending on the options for the account, may send an administrative email about the change, and may update a DNS entry.
How to locate your Internet Visitors
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http://www.maxmind.com/ Locate your visitors using GeoIP, an OPenSource/OpenData solution to finding IP address locations. MaxMind also offer "premium" solutions for those who need automatic updates and greater accuracy.