global config to force phone to use private subnet in shared-network enviroment?

[Randall C Grimshaw]

The short answer is no.
The allow / deny rules control pool access... there is no global pool that would span all subnets - if you see what I mean. In addition, there is an issue with windows behavior as subsequent to obtaining the lease it does some network discovery using DHCP inform requests. If you do have any global values set such as DNS servers... any subnet local values provided to support i.e. a landing page for your private network will be overridden.

Randall Grimshaw rgrimsha at syr.edu
________________________________________
From: dhcp-users-bounces+rgrimsha=syr.edu at lists.isc.org [dhcp-users-bounces+rgrimsha=syr.edu at lists.isc.org] On Behalf Of Sue True [bloomingtonian at gmail.com]
Sent: Wednesday, July 20, 2011 11:56 AM
To: Users of ISC DHCP
Subject: global config to force phone to use private subnet in shared-network   enviroment?

Greetings,

I've been trying to get this work with no luck, so I'll ask the list to
see if it's possible.

In our config, we usually have two subnets in a shared-network, one is
private(10.10.x.x) used for phones, the other is public, right now we have
class defined for phone, and config 'allow/deny member' to each
private/public subnet so phones pickup address from 10.10 network only.

Since we have hundreds of networks and I wonder if there is a way achieve
the above using global option, I've tried

if binary-to-ascii(10,8,".",substring(leased-address,0,2)) = "10.10" {
     allow members of "i2004-clients";
}else{
     deny members of "i2004-clients";
}

But got error:
/etc/dhcpd/dhcpd.conf line 147: expecting allow/deny key
     deny members



Thanks in advance..
Sue
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