Blake Hudson blake at
Tue Feb 12 17:56:31 UTC 2008

-------- Original Message  --------
From: Peter Saksi <Peter at>
To: dhcp-users at
Date: Tuesday, February 12, 2008 11:22:32 AM
> Hi All,
> Im trying to figure out how to deny MAC-addr to connect to the dhcp server.
> The story,
> I have access to 2 dhcp server, one I have admin access but not the other.
> When I run my IPTV reciver (box) on the net it will connect to "my" dhcp
> server and use that ipaddr result will be no TV pic. It should be connecting
> to the one I dont have admin access. How do I deny the MAC-addr of the box
> not to connect to my server ?
> ultra_10:~# uname -a
> Linux ultra_10 2.6.18-5-sparc64 #1 Sat Dec 22 03:07:31 UTC 2007 sparc64
> GNU/Linux ultra_10:~# dhcpd3 -v Internet Systems Consortium DHCP Server
> V3.0.4 Copyright 2004-2006 Internet Systems Consortium.
> All rights reserved. 
> Peter
> ---------EOF--------------------
It sounds like you are connecting your DHCP to the net. If your ISP has 
not taken preventative steps this can cause a lot of problems for them. 
I would primarily suggest that you separate your internal network from 
your ISP's network via a SOHO/Linux/BSD router. If this is not possible, 
or practical, you should set your DHCP server to allocate addresses only 
to known hosts...

In your subnet/pool stanza, define 'deny unknown-clients;'. Then, 
manually define each host that should be receiving an IP from your DHCP 
server. man dhcpd.conf for examples and specifics.


More information about the dhcp-users mailing list