DHCP client how to make it pose as windows dhcp client

Ralph Droms rdroms at cisco.com
Sun Apr 27 16:15:55 UTC 2008

Search for "dhcp os fingerprinting"; you should be able to track down  
info about what options to send to mimic Windows behavior.

- Ralph

On Apr 27, 2008, at Apr 27, 2008,10:23 AM, Glenn Satchell wrote:

>> Date: Sun, 27 Apr 2008 15:40:07 +0530
>> From: "Arup Malakar" <amalakar at gmail.com>
>> To: dhcp-users at isc.org
>> Subject: Re: DHCP client how to make it pose as windows dhcp client
>> On Sun, Apr 27, 2008 at 3:26 PM, Lars Jacobsen <lars-jacobsen at newmail.dk 
>> >
>> wrote:
>>> Have you tried releasing the IP form Windows before requesting IP  
>>> from
>>> Linux. Or let the lese time out. If neigher worksy you should  
>>> contact the
>>> ISP to hear if they may have something misconfigured.
>> I haven't tried releasing the ip from windows, which I will try and  
>> let you
>> know. As I have heard from other users of the ISP it seems the ISP  
>> have
>> mis-configured the dhcp server and other users are also facing the  
>> same
>> problem. They have tried mailing the customer care, but their  
>> customer care
>> is shit and there is no way I could make the ISP change the  
>> configuration.
>> And I don't have the option of going for another ISP either.  So  
>> the only
>> way is to pose as a windows machine and get connected.
>> Regards,
>> Arup Malakar
> Can you install a packet sniifer on WIndows, eg Wireshark, and look at
> what gets sent and received in the DHCP packets? Then do the same for
> Linux.
> Packet sniffing is the only reliable way to see what is happenning in
> the conversation between your computer and the ISP.
> Otherwise one solution might be to use a Windows machine with Internet
> Connection Sharing as a gateway for the Linux machines.
> regards,
> -glenn

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