Starting with SP5, you can disable ICMP redirects, to prevent a denial of service attack, by using Regedt32 to navigate to:
HKEY_LOCAL_MACHINE\System\Currentcontrolset\Services\Tcpip\Parameters
On the Edit menu, Add Value name EnableICMPRedirects, a type REG_DWORD entry, and set the data value to 0. A data value of 1 enables ICMP redirects.
NOTE: See Q195686 - Explanation of ICMP Redirect Behavior.
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