All right, but if  I know  the MAC address of the computers that are
stealing IP's from my network, (not the one's that belongs to my network!)
it should be more easy if I manage to deny access to those computers to my
server, because there are "only" a few computers stealing IP's from my
server.

----- Original Message -----
From: "Filipe Joel de Almeida" <[EMAIL PROTECTED]>
Sent: Thursday, March 07, 2002 6:47 PM
Subject: RE: DHCP Block


If you get a list of all the MAC addresses of your computer NIC's, all
you have to do is:

- Create a DHCP reservation for every one of your computers
- Create an exclusion range in the DHCP scope, excluding all IP's. This
way, your DHCP server will only give IP's to the computers which MAC
addresses you inserted in the Reservations.

To know the MAC address of a computer remotely you do this command in an
command prompt:

Nbtstat -a <IP>

Where <IP> is the IP address of the machine you want to know the MAC
Address.

Filipe Joel de Almeida
Network Consultant
[EMAIL PROTECTED]
Mobile: +351 967819600


-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]] On Behalf Of pedro
Sent: ter�a-feira, 5 de Mar�o de 2002 20:23
To: NT 2000 Discussions
Subject: DHCP Block

I have a DHCP Server on my network and I'm having some problems. My
network
has about 60 workstations and I my DHCP has 60 IP�s to distribute.
Unfortunately, my network is inside a campus and it is connected to
several
other�s networks. So, when someone from another network inside the
campus
tries to acquire an IP from a DHCP server, the machine "steals" one IP
from
my DHCP Server. Is there any way that I can block those machines from
stealing IP�s from my DHCP server? If I know the MAC address of the
network
adapter from the client, I could block it from getting IP�s from my
Server??
If anyone has suggestions, I would appreciate.



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