Diff client IDs -> multiple leases

Ralph Blach rcblach at blach.dnsalias.org
Sun Mar 12 19:46:49 UTC 2006

Linux can send a client ID.  Just send the same client ID that windows 

This is configurable.


Jesse Saletan wrote:
> I run a lab of about 250 systems and have been using ISC's DHCP ever since 
> I replaced the MS DHCP server set up by my predecessor.  It's been working 
> beautifully, but now I find myself coming up against a problem that has 
> been discussed on this list before.
> There are a number of systems on my network that multiboot between Windows 
> and Linux.  When a Windows system requests a lease it sends its MAC 
> address as the client ID.  When that same system is rebooted into linux 
> the DHCP client does not send a client ID, and it is therefore issued a 
> new lease with a different IP address.  I would like to limit clients 
> to a single lease and IP address.
> Back in 2004/2005 a guy named Didi posted some patches to change the way 
> the dhcp server handles client IDs in order to address this problem.  Some 
> discussion followed about whether it was proper to violate the the RFC to 
> produce the desired result, and it was proposed that an option be added to 
> dhcpd.conf to control this behavior, with appropriate warnings that it was 
> not RFC compliant.
> Can anyone bring me up to date on the status of this issue?  Does the 
> current dhcp server include any option for how to handle client IDs?  Or 
> is there some other way to produce the desired result, other than 
> modifying all the dhcp clients' settings?
> Thanks,
> Jesse

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