[Fedora] Re: DHCP security

[Ashley M. Kirchner]

Ed Kasky wrote:
> That depends on your wireless device.  I use Linksys and use static 
> dhcp based on mac address as well as WEP for  a more secure netowrk. 
> If the mac address is not in the list, it won't get access.
    This might work for wireless, however in a mixed environment, where 
one DHCP server is serving both wired as well as wireless, that might 
not work.  Assuming a client actually broadcasted a DHCPREQUEST to get 
an IP, you can have the DHCP server deny it based on it being an unknown 
MAC.  But if someone manually configures their machine and simply plugs 
into your network, how will your DHCP server know to block them?  It 
never assigned an IP to them, it never even received a request for an 
IP, so how would it know what to do?