Using two DHCP daemons in the same subnet, ignore a specific client

[Darshaka Pathirana]

On 10/06/2010 02:12 PM, Thomas Lange wrote:
> If you have two DHCP daemons in the subnet of your FAI infrastructure,
> and one uses the option allow unknown-clients you are in trouble,
> because if this daemon responses faster it will give the install
> client an IP address and the other daemon has no chance to control the
> clients boot parameters for FAI.
>
> Now I've found a solution for this.
>
> I have a DHCP daemon A which includes the allow unknown-clients
> option. In the same subnet I like to run a second DHCP daemon B for my
> FAI infrastructure which includes deny unknown-clients and contains a
> list of all my install clients using their MAC address.
>
> Since I know the MAC addresses of my install clients (that should be
> controlled by B), I can tell DHCP A to ignore those clients.
>
> For each install client I add a line into DHCPd.conf (of DHCP A) like this:
>
> host demohost {hardware ethernet 00:14:0b:06:6e:4a;ignore booting;}
>
> That's it. If demohost does a PXE boot, DHCP A will ignore it, and
> DHCP B can answer the request.

Cool. Thx for sharing!

Regards,
  - Darsha