Restricting leases
Patrick Trapp
ptrapp at nex-tech.com
Thu Jan 29 16:40:15 UTC 2015
Thanks, Jason. I'm off to educate myself enough to have an intelligent question when I return. ;-)
Have a great day!
________________________________
From: dhcp-users-bounces at lists.isc.org [dhcp-users-bounces at lists.isc.org] on behalf of Jason Gerfen [jason.gerfen at gmail.com]
Sent: Thursday, January 29, 2015 10:26 AM
To: Users of ISC DHCP
Subject: Re: Restricting leases
Good morning Patrick,
While the typical RTFM is always encouraged I believe the option(s) that will benefit you the most regarding a wildcard whitelist of nodes per network segment would be the section within the dhcpd.conf titled 'client classing' & 'subclasses'.
The examples provided should give you some insight into allowing devices based on the hardware identifier or other unique device identifiers. More information on these can be obtained in RFC-2132 (https://www.ietf.org/rfc/rfc2131.txt) table 3 (fields and options in a DHCP message).
Hope this helps
On Thu, Jan 29, 2015 at 9:12 AM, Patrick Trapp <ptrapp at nex-tech.com<mailto:ptrapp at nex-tech.com>> wrote:
First, an apology - I'm not even sure how to ask this question, so my pre-post research really got me nowhere. So I'm really looking for a direction as much as an answer - I hate wasting people's time asking a question when I don't really know enough to ask the question well.
Second, the question(s) - Can we/how can we/should we limit the devices that the DHCP server provides addresses to? For example, legitimate devices on this network are 80% produced by two specific manufacturers. There should be virtually no workstations on this network - legitimate workstations accessing this network will do so via another network and get their addresses from a different DHCP system. The only reason a workstation should be on this network is if a technician is troubleshooting.
So I am looking at the viability of allowing devices from the known manufacturers and whitelisting the specific devices carried by our technicians and not providing addresses for unexpected devices.
I fully expect and deserve an RTFM - I'm hoping someone can give me some ideas where I should be looking and what key words will get me where I need to go.
Thanks for reading,
Patrick
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