Re: Duplicate MAC problems

On Nov 23, 11:01 am, Dave Uhring <daveuhr...@xxxxxxxxx> wrote:
On Thu, 22 Nov 2007 17:56:31 -0800, Sonny wrote:
Sorry if this is a newbie question, I hope somebody can help. It is
about getting different IP addresses for same (software) MAC from the
DHCP server. For example, I have 2 PCs. We copy the software MAC from
the first PC to the other PC.

Why do you want to do something as totally stupid as that?

When we do that, the DHCP gives the same
IP address, therefore both PCs have the same IP address. Is there a way
to configure the DHCP server that besides the MAC, there is another
factor to determine what IP address will be given, let's say the host
name? Thanks in advance!

Even if the DHCP server could be twisted to allocate different addresses
for the same Ethernet address, the systems still could not communicate
either with each other or with any other system on the same network.
Within a network IP addresses are *not* used; Ethernet addresses are.


We are in an ISP company. Hackers know how the DHCP works, and using
this knowledge they copy MAC addresses of legitimate clients to have
Internet connections. We want to know how to configure the DHCP to
assign IP addresses not just based only on MAC so only legitimate
clients can have access.
.

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