[CentOS] Re: ISC dhcpd and Vista clients

Tim Utschig tim at magnumsemi.com
Thu Jul 31 19:24:46 UTC 2008

On 07/31/08 12:02, Scott Silva wrote:
> The other answer is to get ISC dhcpd to honor the broadcast flag, and 
> broadcast all packets instead of unicasting the answer packets. That I 
> can't find a setting for.

I have no Vista clients to test with, but have you tried 
"always-broadcast on;" ?

 From "man dhcpd.conf" on CentOS 5.2:

     always-broadcast flag;

     The  DHCP and BOOTP protocols both require DHCP and BOOTP clients
     to set the broadcast bit in  the  flags  field  of  the  BOOTP
     message header.   Unfortunately, some DHCP and BOOTP clients do
     not do this, and therefore may not receive responses from the
     DHCP server.    The DHCP server can be made to always broadcast
     its responses to clients by setting this flag to 'on' for the
     relevant scope; relevant scopes would be inside a conditional
     statement, as a parameter for a class, or as a parameter for a
     host declaration.   To avoid creating excess broadcast  traffic
     on  your network, we recommend that you restrict the use of this
     option to as few clients as possible.   For example, the
     Microsoft DHCP client is known not to have this problem, as are
     the OpenTransport and ISC DHCP clients.

Tim Utschig <tim at magnumsemi.com>
408-934-3754 (desk)
408-644-3861 (cell)

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