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Mac address on my motherboard changed randomly - Page 2

post #11 of 21
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Quote:
Originally Posted by 420Assassin View Post
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
sorry, also that software just changes the available setting thats in my network adapter configuration.
Changing it to "Not Preset" just defaults it to the MAC address which is the same as my dads computer.
The only reason i have internet access currently is because i changed that setting from "not preset" to my old mac address.
Id rather have my mac address returned back to normal (saved in the ROM of the NIC) instead of masking it with another MAC
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post #12 of 21
do u know what orig mac btw? if so use program and change back to orig. u can enter a mac manually with it
     
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post #13 of 21
Quote:
Originally Posted by patawic View Post
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.
Ok but your router cannot change mac addreses (Dynamic host configuration protocol) assigns IP's from a pool and has no idea or concern for MAC addresses as its on a different network layer entirely the mac is on the data link layer (2) DHCP is on layer (3) although yes i know they can communicate as the data/packets are encapsulated and passed through the layers. but that layer 2 protocol( data link) does not assign IP's or Macs it is the physical address of the card.

I have read the page suggested and yes it would appear i am wrong- you can change a Mac but only as windows see's it the mac is still hard burned into the Nic unless you can switch the chip out with a different one.
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post #14 of 21
but on routes there options to only allow a connection with a mac address from the list below.. that way if a comp with a mac not in list cant get on network
     
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post #15 of 21
http://en.wikipedia.org/wiki/OSI_model

Just for information

Here is the link to the osi model which most networks today use and how it maps to the tcp/ip protocol- this will inform you of the reasons why a router or any other hardware componant cannot change your MAC. and that tcp/ip dhcp have no interaction or control over layer 2 protocols other than to receive and send packets from this layer, logical (ip) and physical addressing(MAC) is seperate and is kept seperate within the osi network model

I still stand by what io said earlier if your Mac has changed you will need a new NIC or use software as mentioned above to spoof it.
regards

o and something i just remembered we ran into while installing a new server. some ISP's and services including some software will bind to a specific mac address so if you change it you may find the service no longer works. This is more prominent in fixed IP or commercial networks but something to consider.
Edited by Ghilly - 6/15/11 at 5:24am
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post #16 of 21
Quote:
Originally Posted by patawic View Post
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.
OK this is impossible as a mac address is a 48bit hexadecimal number and an IP is a 32 bit binary number(ipv4) so i think you may have confusion over the definition of a MAC and /or IP
Edited by Ghilly - 6/15/11 at 6:17am
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post #17 of 21
I am surprised that this is even being discussed on here. Mac addresses cannot be changed, they can however be spoofed. That should be the end of that discusion.

Now onto the OP, I am unlcear as to what your issue really is. Mac address can't be changed, nor is the router going to hand out a mac address. Is it possible for you to give us screen shots of what you are talking about? Also maybe some symptons of the issue you are experiencing?
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post #18 of 21
Thread Starter 
my original mac address was
1C6F648F125B
it is now displaying as
00252291a68b in both my bios, windows, and in the linux livecd i booted.
My MAC address has changed, and its not being spoofed.
Edited by patawic - 6/15/11 at 2:19pm
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post #19 of 21
Your MAC cannot permanently change. A device's MAC address is hard-coded at the time of manufacturing. MACs can be spoofed but they cannot be changed. Something else is going on...

Also, you may want to ask a mod to move this thread to the Networking & Security section. You'll get more relevant traffic there.
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post #20 of 21
Your original mac address (1C6F648F125B) is not even on the vendor list. The new one is ASROCK (00252291a68b) and is on the vendor list. Your sig rig says it's a gigabyte board, not sure if you haven't updated your sig rig, or something is really amiss.
 
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