How to turn off spoof detection in the ISA firewall

Question #1262

How do I turn off spoof detection in the ISA firewall? (2204)

Answer

Click Start, click Run, type regedit, and then click OK.
Locate and then click the following registry subkey:
HKEY_LOCAL_MACHINE/SYSTEM/CurrentControlSet/Services/FwEng/Parameters
If the Parameters subkey is not displayed, follow these steps to create this subkey:
Click the FwEng subkey.
On the Edit menu, point to New, and then click Key.
To name the key, type Parameters, and then press ENTER.
Right-click Parameters, point to New, and then click DWORD Value.
To name the value, type DisableSpoofDetection, and then press ENTER.
Right-click DisableSpoofDetection, and then click Modify.
In the Value data box, type 1, and then click OK.

Warning This setting disables IP Spoof Detection on the ISA Server 2004-based computer. To enable IP Spoof Detection, set the DisableSpoofDetection value to 0. This is the default value.
Exit Registry Editor, and then restart the ISA Server 2004 services.

http://support.microsoft.com/default.aspx?scid=kb;en-us;838114

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