"deny duplicates;" not working?

[Sten Carlsen]

As mentioned, I never used this.

I would look into man dhcpd.conf - spawning classes.
You should be able to spawn a new subclass for each MAC address and
allocate IP addresses accordingly.

On 08/01/13 22:23, Neff, Glen wrote:
> I guess i'm using the default, which is UID, so I guess I have to
> specify a class?
>  
> How do I specify a class that includes all MAC addresses?
>  
> -G
>
> /*
>  * Glen R. J. Neff
>  * USD Lab Operations Infrastructure Team
>  * glen.neff at emc.com
>  *
>  * EMC^2 == E^2
>  */
>  
> ------------------------------------------------------------------------
> *From:* dhcp-users-bounces+glen.neff=emc.com at lists.isc.org
> [dhcp-users-bounces+glen.neff=emc.com at lists.isc.org] On Behalf Of Sten
> Carlsen [stenc at s-carlsen.dk]
> *Sent:* Tuesday, January 08, 2013 3:49 PM
> *To:* dhcp-users at lists.isc.org
> *Subject:* Re: "deny duplicates;" not working?
>
> How is your configuration? do you specifically use the MAC or is it
> the default (which is UID)?
>
> On 08/01/13 20:13, Neff, Glen wrote:
>> >The main piece of information to identify a client is actually the
>> UID, so with a new UID -> a new client, obviously it >can not get the
>> same IP, that is reserved for the old client.
>> >You may have luck looking into classes and subclasses. Possibly with
>> "spawn". I have never used these features >but I have a feeling they
>> may actually do what you need.
>> >Use the hardware = MAC to create your subclass and that could be
>> independant from the UID - I think.
>> Is dhcpd.conf(5) erroneous then?:
>>  
>>        The duplicates keyword
>>         allow duplicates;
>>         deny duplicates;
>>        Host declarations can match client messages based on  the 
>> DHCP  Client
>>        Identifier  option  or  based on the client's network hardware
>> type and
>>        MAC address.   If the MAC address is used, the  host 
>> declaration  will
>>        match  any  client  with that MAC address - even clients with
>> different
>>        client identifiers.   This doesn't normally  happen,  but  is 
>> possible
>>        when  one computer has more than one operating system
>> installed on it -
>>        for example, Microsoft Windows and NetBSD or Linux.
>>        The duplicates flag tells the DHCP server that if a request is
>> received
>>        from  a  client that matches the MAC address of a host
>> declaration, any
>>        other leases matching that MAC  address  should  be 
>> discarded  by  the
>>        server,  even  if the UID is not the same.   This is a
>> violation of the
>>        DHCP protocol, but can prevent clients whose client
>> identifiers  change
>>        regularly  from  holding  many  leases  at  the same time.  By
>> default,
>>        duplicates are allowed.
>> -G
>>
>> /*
>>  * Glen R. J. Neff
>>  * USD Lab Operations Infrastructure Team
>>  * glen.neff at emc.com
>>  *
>>  * EMC^2 == E^2
>>  */
>>
>>
>> _______________________________________________
>> dhcp-users mailing list
>> dhcp-users at lists.isc.org
>> https://lists.isc.org/mailman/listinfo/dhcp-users
>
> -- 
> Best regards
>
> Sten Carlsen
>
> No improvements come from shouting:
>        "MALE BOVINE MANURE!!!"
>
>
> _______________________________________________
> dhcp-users mailing list
> dhcp-users at lists.isc.org
> https://lists.isc.org/mailman/listinfo/dhcp-users

-- 
Best regards

Sten Carlsen

No improvements come from shouting:
       "MALE BOVINE MANURE!!!"

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