Home > Uncategorized > Dead gateway detection in the Windows TCP/IP stack

Dead gateway detection in the Windows TCP/IP stack

I just had an “ahh hah” moment when I came across DeadGWDetectDefault/EnableDeadGWDetect registry value (located at HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters).

This is what causes a static route entry to be placed in the table if the gateway assigned to a route inclusive of the address fails to route the packets.

To quote:

[When set to a value of 1,] allows TCP to detect failure of the default gateway and to adjust the IP routing table to use another default gateway.

1 is the default setting.

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