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Mohdanwarahmed
15 pts.
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Q:
Locking the IP address to the MAC address
Windows server, DHCP, cisco router or firewall, Cisco Routers, Routers, MAC address, Network administration
Hi all....

Aim: Ip address lets say 10.0.0.1 when assigned to a particular MAC let it be pc, should not be used by any other mac, even if i switch off the device.

I tried through dhcp reservation option which maps the ip address to a mac address, it works. but the problem is, when i switch off the pc, this ip address can be used on the other machine(pc).

Is there any such solution in microsoft dhcp or else can we do it through the cisco router???? If any please give me the detail procedure.
Posted: 06/15/2009 @ 01:35 AM (PDT)
ASKED: Jun 15 2009  9:06 AM GMT
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BlankReg
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You need to also remove the IP address from the DHCP pool, then it can not be used by any other PC. Do that and only the one with the correct MAC will get that IP address. Just make the address pool smaller, that is all you need to do.
Last Answered: Jun 15 2009  9:43 AM GMT by BlankReg   11270 pts.
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Petkoa   985 pts.  |   Jun 15 2009  4:57PM GMT

Hi Mohdanwarahmed,

It’s cool to assign fixed IP’s to specific PCs, but don’t assume that this DHCP solution is of any security significance… Anybody willing to circumvent your settings could do it by (1) wire-tapping the MAC of the “good” PC (its NIC, in fact) - e.g., by tcpdump; and (2) setting his/her PC’s (NIC, again) MAC to the wire-tapped in an appropriate moment - when the “good” PC is off-line. Nowadays almost any NIC/driver combination allows for this.

But, if you are setting IPs like this in a trustworthy and friendly environment… well, there are some benefits (I, personally did use and still use them), you probably thought them over, if you are asking about this kind of setup.

BR and good luck,

Petko

 
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