On Fri, May 20, 2005 at 07:28:51AM +0800, Lai Zit Seng wrote: Hi Lai, please Bottom post and Trim. > On Thu, 19 May 2005, Phil wrote: > > > I did but it does not provide a way to disable certain MAC addresses... > > > > On 5/19/05, Rick Stevens <rstevens@xxxxxxxxxxxxxxx> wrote: > >> Phil wrote: > >>> Hi, > >>> > >>> I am running DHCP (also with DDNS) on Fedora Core 2. > >>> > >>> I am getting some instances of blank hostnames getting an IP > >>> address... I want to prevent those people from renewing their IP. > >>> > >>> So I actually have a 2 questions; > >>> > >>> 1- Can I prevent blank host names from getting a DHCP address? (I know > >>> I can deny unknown hosts, but that would require me to enter in all my > >>> known hosts manually, somethign I do not want to do, since there is > >>> over 250 of them) > >>> 2- Since I know their MAC addresses is there a way to deny them a IP from DHCP? > >> > You can use 'deny known clients', and then list all the MAC addresses you > want to ban with a host declaration. Also - Be aware that many Ethernet cards can be configured with ANY MAC address someone want to put in them. If you are trying to do this as a security measure or access control thing, you may be more vulnerable than you think. OTOH - for easing an admin's life it works great. -- Jeff Kinz, Emergent Research, Hudson, MA.
