How to configure the DHCP to make a priority between the subnets inside same shared network

[Tim Gavin]

On 02/01/2011 11:54 AM, José Queiroz wrote:
>
> 2011/2/1 Tim Gavin <livewire98801 at gmail.com 
> <mailto:livewire98801 at gmail.com>>
>
>     What's wrong with that, and why would it break?
>
>
> Each broadcast domain should correspond to a subnet range. If you have 
> several subnets on the same broadcast domain, the DHCP server cannot 
> tell apart which request came from which subnet.

The DHCP server doesn't need to know where the request is coming from. . 
. if it knows, the request should be a 'renew', and should renew the 
address no matter which block it was assigned from.

>
> The "right way" to solve your problem is break your network in several 
> broadcast domains (e.g. VLANs), and assign a subnet range to each 
> broadcast domain.

No, the "right way" is to have a big enough block to handle all your 
clients.  If that means segregating your client base into separate 
VLANs, then sure, but my ultimate solution was to get a bigger 
allocation of IPs.  Maybe neither one would work for someone else.  Or, 
like my example, my final solution was to get a bigger block, but I had 
to deal with two blocks on one VLAN for a while until that happened.

>
> Another way to deal with your problem is create fixed address 
> assignments, to the machines in all subnet ranges, except one. This 
> last one can work from the address pool, that now is unique.

In my example it was an ISP network. . . fixed assignments work in a 
corporate campus, but not on an ISP network, at least not well.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.isc.org/pipermail/dhcp-users/attachments/20110201/2fab5e76/attachment.html>