Configure DHCP Server for Unicast (Windows NT/2000/XP)

By default, the Windows DHCP server sends all DHCP responses as IP broadcasts to the limited broadcast address (255.255.255.255). However, the DHCP server can be configured send to unicast responses by applying this tweak.

This tweak can be easily applied using WinGuides Tweak Manager. Download a free trial now!

Open your registry and find or create the key below.

Create a new DWORD value, or modify the existing value, called "IgnoreBroadcastFlag" and set it according to the value data below.

Exit your registry; you may need to restart or log out of Windows for the change to take effect.

Note: Versions of the DHCP server prior to Windows NT 4.0 ignored the broadcast flag in client DHCP packets, and broadcast all replies.

		(Default)	REG_SZ	(value not set)
		IgnoreBroadcastFlag	REG_DWORD	0x00000000 (0)

	HKEY_LOCAL_MACHINE\CurrentControlSet\Services\DHCPServer\Par...

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Disclaimer: Modifying the registry can cause serious problems that may require you to reinstall your operating system. We cannot guarantee that problems resulting from modifications to the registry can be solved. Use the information provided at your own risk.