By default, the IP Spoof Detection feature is enabled in Microsoft Internet Security and Acceleration (ISA) Server 2004, in Microsoft Internet Security and Acceleration (ISA) Server 2006, in Microsoft Forefront Threat Management Gateway Medium Business Edition, and in Windows Essential Business Server 2008.
Although there is no way to disable this feature in the ISA Microsoft Management Console (MMC) snap-in, you can disable this feature in the Windows registry.
However, I have to tell you that you should have a very specific reason for disabling spoof detection. Don’t use this solution to fix a misconfiguration problem on your part. Otherwise, you’ll have broken the firewall’s security model and not fixed the original problem.
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Thomas W Shinder, M.D., MCSE
Sr. Consultant / Technical Writer