Locking the IP address to the MAC address

15 pts.
Tags:
cisco router or firewall
Cisco Routers
DHCP
MAC address
Network administration
Routers
Windows Server
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)

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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.

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  • petkoa
    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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  • Mohdanwarahmed
    I only just recently discovered the world of blogs, and I have to say you're quickly becoming one of my favorites. Great post and look forward to seeing more from you.
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