Use of BROADCAST (B) flag in dhcp...
15th Nov 2006, 09:30 GMT
DHCP server or relay agent sending or relaying a DHCP message directly to a DHCP client should examine the BROADCAST bit in the ’flags’ field. If this bit is set to 1, the DHCP message SHOULD be sent as an IP broadcast using an IP broadcast address as the IP destination address and the link-layer broadcast address as the link-layer destination address. If the BROADCAST bit is cleared to 0, the message SHOULD be sent as an IP unicast to the IP address specified in the ’yiaddr’ field and the link-layer address specified in the ’chaddr’ field. By default, Windows Vista will start with BROADCAST(B) flag set to 1 which means DHCP Server or realy agent has to sent reply to broadcast address. User can change this setting by defining REG_DWORD value DhcpConnForceBroadcastFlag under HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\Interfaces\{GUID} registry key. Thanks, Govind K Saoji SDE | Microsoft DHCP Team
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