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Thread: Changing a MAC address?




  1. #11
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    it isn't possible to change the MAC address physically on a NIC unless you flash it like was mentioned before, the only other thing you could do is force the software to make it something else.. lans run on mac addresses, not ip adresses, unless you introduce routing and some other elements. but when you are say at a game lan somewhere, your computers all talk via mac addresses, not ip's. your nic only listens to traffic sent to it, not other machines, if you were to change your mac address via software (like in the os) i dont know whether you would recieve your traffic, i imagine the software will read it and take it for your nic, but im not sure on that one. cheers!!
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  2. #12
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    Quote Originally Posted by The Wizard
    it isn't possible to change the MAC address physically on a NIC unless you flash it like was mentioned before, the only other thing you could do is force the software to make it something else.. lans run on mac addresses, not ip adresses.
    That is what I said earlier, so I agree fully. Without a MAC address, TCP/IP DHCP wouldn't work well. Beause when the computer boots, it's gonna broadcast for an IP because it doesn't have one. Then the first DHCP server that hears the request gives the offering. But how does the machine get the offering from the DHCP server? It doesn't have an IP address. But it's MAC address was in the packets that it boradcast for a DHCP server.

    Obviosly there is more to this, but I don't wanna explain it. If you wanna find out, search for the OSI 7 layer model. And there are other examples of these types of dependency. Anyway

    Later

  3. #13

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    All the info i've seen is for software MAC changes, which is possible, in doing that one would nearly have to renew their IP manually as to the DHCP/Network machines, it would be as if u had just changed your NIC and booted again. then again...

    flashin ya ROM would be another way, but thats painful, for the few advantages one or two people may gain...

    in terms of the NIC having trouble with obtaining an IP, during boot up, the NIC usually has to wait until the software starts the device so by then, the software can "cloak" the MAC...

    as far as my knowledge goes, this is where it stops!
    sKuLLsHoT
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  4. #14

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    changing the EPROM would be good if u were unlucky enough to get two generic NICs with shared MAC addresses like some created by ****ty manufacturers, they use a smaller number of MAC addresses than cards they make so some re-use the MAC's... not a prob until u get a matching pair...

    would be okto use software maskiung but an EPROM burn would be better if u were gonna use multi-os' etc on either machine..
    alternatively one could just buy a new nic... i mean sif htey r gonna get the same nic anyway.. .except it is probable that it may happen in a workplace with say 600+ machines that in a big batch order of machines with generic nics that there MAY be double ups....
    SileNceR, Messenger of the Dark and the Night. To post quality, or not to post at all, THAT is the Question - Never again ask what can my post count do for me besides increasing my ego, but instead ask what can I do to help someone else!
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  5. #15

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    most organisations that would buy an excess amount of PCs will spend the extra few bux for an intel or even 3com NIC, khkeldar will tell ya...

    if u r buying a large volume of PCs the manufacturer should know better than to supply generic crap...

    generic...hehe
    sKuLLsHoT
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  6. #16
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    Quote Originally Posted by skullshot
    most organisations that would buy an excess amount of PCs will spend the extra few bux for an intel or even 3com NIC, khkeldar will tell ya...

    if u r buying a large volume of PCs the manufacturer should know better than to supply generic crap...

    generic...hehe
    I guess I'm one unlucky mofo then.. Where i work we bought 5 gross [thats 720] 3com 905C-TX NICs when we upgraded all our PCs from 10 MB NICs to 10/100 NICs.. we had 4 which had duplicate MAC addresses of others within the company.. I guess thats not bad and 3com was good enough to send us replacements free of charge. But I'm just saying that it happened with a brand name NIC to me..

  7. #17

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    see, it happens :D
    SileNceR, Messenger of the Dark and the Night. To post quality, or not to post at all, THAT is the Question - Never again ask what can my post count do for me besides increasing my ego, but instead ask what can I do to help someone else!
    Overclockers Melbourne (http://www.ocmelbourne.com).

  8. #18
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    yer the man silencer. hehe :)
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