[CentOS] 2 DHCP server in one subnet

Bleier Thomas Thomas.Bleier at arcs.ac.at
Wed Nov 28 13:43:25 UTC 2007

Hi Fajar,

on the Linux DHCPD I would add an "allow" directive to the pool, and put your LTSP clients in a class:

subnet netmask {
  class "ltsp" {
    match if ...

  pool {
    allow members of "ltsp";

Afaik W2K DHCP does not have such an option - so you could probably try to fill the W2K DHCP address range with reservations, so that it does not have any more IP addresses to serve for other clients that you want. But I did not test that, so YMMV...

You said you have to have your W2K server running - but couldn't you just disable the DHCP-Server on it and serve all your clients form the Linux DHCPD? Recent versions of dhcpd also support dynamic DNS registration, so I don't see any (technical) reason why to keep the W2K DHCP...

Just my 2c,

Thomas Bleier, DI
Information Management
Austrian Research Centers GmbH - ARC
HG Wien - FN 115980i - ATU14703506
2444 Seibersdorf, Austria

Mobile: +43 (664) 8251279
E-Mail: thomas.bleier at arcs.ac.at

-----Original Message-----
From: centos-bounces at centos.org [mailto:centos-bounces at centos.org] On Behalf Of Fajar Priyanto
Sent: Wednesday, November 28, 2007 2:18 PM
To: CentOS mailing list
Subject: [CentOS] 2 DHCP server in one subnet

Hello all,
In the network there is already a W2K server serving as DHCP server for the network. Then we want to implement LTSP, so we need to setup another DHCP server, right?

Due to unexpected reason (little by little migration of w98 clients to LTSP), we need to keep the W2K server running in that network. Can we then have 2 DHCP server in the same subnet, only serving pre-determine clients using mac address? Any clue on how to setup the dhcpd.conf?

Thank you very much.
Fajar Priyanto | Reg'd Linux User #327841 | Linux tutorial http://linux2.arinet.org
20:16:32 up 14 min, 2.6.22-14-generic GNU/Linux Let's use OpenOffice. http://www.openoffice.org The real challenge of teaching is getting your students motivated to learn.

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