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Mac address on my motherboard changed randomly

post #1 of 21
Thread Starter 
Ok, here's the issue.
My computer hard froze about 2 hours ago, upon reboot i was getting ip conflict errors like you wouldn't believe.

I then realised that my onboard NIC has the same MAC address as my dads computer, i have no idea as to how this could occur.

Is there any way that i can reflash my old mac address onto the cards ROM?
its a realtek 6168

thanks in advanced.
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post #2 of 21
As far as i know MAC addresses are burned into the hardware and cannot be changed, As all Mac addresses are unique and hardware vendors must ensure they cannot be changed.

I am at a loss as to how you could have changed the MAC address on your Nic- If you have then i beleive you will require a new Nic, this is what i understand to be the case - well is was when i did my CCNA.

Thats what i remember from my training anyway and i'm not aware of the IEEE changing the rules regarding MAC addresses.

PS Does your Motherboard have 2 Nics ? if it does use the other one as that will have a different MAC and resolve your issue.

Also i'm confused a sto haw your MAC is affecting your IP???? as most broadband providers assign IP's dynamically so your IP will change when you reboot your router But your MAC will never change unless you change NIcs

regards
Edited by Ghilly - 6/15/11 at 3:52am
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post #3 of 21
you can change your mac address check this site out
http://www.technitium.com/tmac/index.html
     
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post #4 of 21
Thread Starter 
my router is a DHCP server for my local network, and because its changed my MAC to the same ip as another computer on the network, it has assigned both computers with the same MAC.

No my motherboard only has 1 NIC, im currently using some crappy PCI card.
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post #5 of 21
Quote:
Originally Posted by ghilly View Post
as far as i know mac addresses are burned into the hardware and cannot be changed, as all mac addresses are unique and hardware vendors must ensure they cannot be changed.

I am at a loss as to how you could have changed the mac address on your nic- if you have then i beleive you will require a new nic, this is what i understand to be the case - well is was when i did my ccna.

Thats what i remember from my training anyway and i'm not aware of the ieee changing the rules regarding mac addresses.

Ps does your motherboard have 2 nics ? If it does use the other one as that will have a different mac and resolve your issue.

Also i'm confused a sto haw your mac is affecting your ip???? As most broadband providers assign ip's dynamically so your ip will change when you reboot your router but your mac will never change unless you change nics

regards
qft.
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post #6 of 21
Thread Starter 
Quote:
Originally Posted by 420Assassin View Post
you can change your mac address check this site out
http://www.technitium.com/tmac/index.html
does that change the MAC in the hardware itself, or is it just masking it?
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post #7 of 21
First you cant change or alter MAC address permanently
secondly it is not possible your Router DHCP allocate same IP's to two different machines.
the solution are many , one you can mannually assign IP or within router map your system MAC address with dedicated IP address this way that ip will only assign against same MAC address.
post #8 of 21
Quote:
Originally Posted by patawic View Post
does that change the MAC in the hardware itself, or is it just masking it?
dont take this wrong way did u read site at all they have a GREAT description on what it does and all. i recommend spend 5 min and reading it. mainly the Misconceptions part
     
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post #9 of 21
Thread Starter 
Quote:
Originally Posted by iphonelover View Post
First you cant change or alter MAC address permanently
secondly it is not possible your Router DHCP allocate same IP's to two different machines.
the solution are many , one you can mannually assign IP or within router map your system MAC address with dedicated IP address this way that ip will only assign against same MAC address.
well, my mac address has changed, I even booted up a linux livecd and it has changed to the ip address of my dads computer.

and the DHCP will allocate the same ip address to multiple computers if they have the same MAC address. It uses MAC addresses to identify devices.
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post #10 of 21
go onto router disable it real quick clear the list. change mac on botch comps have modem grab it put on recognized list re enable it, save then should be good
     
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