[CentOS] Re: ISC dhcpd and Vista clients

Scott Silva ssilva at sgvwater.com
Thu Jul 31 20:45:29 UTC 2008

on 7-31-2008 1:30 PM Glenn spake the following:
> At 03:41 PM 7/31/2008, you wrote:
>> on 7-31-2008 12:24 PM Tim Utschig spake the following:
>>> 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.
>> SO... I have to flood my network with broadcast traffic or pay the 
>> microsoft extortion... Bill strikes again!
>> Thanks for that. I had been reading the dhcp man page (I should say 
>> book! What a long one.) I guess I missed that. I'll have to set any 
>> Vista clients to named hosts so I can limit the traffic.
>> According to that man page, ISC implies that Vista is broken, and 
>> Microsoft implies that ISC is broken. Were playing the blame game again!
>> How fun!  ;-P
>> And I thought it was going to get boring...
> Nice. Microsoft is regressing to its good old formula of flooding the 
> LAN with lots of 'me too' and 'I am here' packets. Way to improve 
> efficiency!
> Yep. Think I'll stick with XP SP2 where and when I can, until I am 
> forced to move on.
> Cheers!
I found a tool on the net to at least make it easier to change the Vista 
behavior. Will have to test it tom. and post a link if anyone wants it.

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You hope everybody uses it, and
you notice quickly if they don't!!!!

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