"deny duplicates;" not working?
stenc at s-carlsen.dk
Tue Jan 8 20:49:06 UTC 2013
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
> client identifiers. This doesn't normally happen, but is
> 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
> 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
> duplicates are allowed.
> * 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
No improvements come from shouting:
"MALE BOVINE MANURE!!!"
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