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Thread: Error during changing MAC address Backtrack 5

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  1. #1
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    Default Error during changing MAC address Backtrack 5

    Hello

    I am "new" to Backtrack and i have some problems with changing my mac address for networking and checking my own network.

    1.

    First of all, I want to know why I can't chage my mac address to for exapmle 00:00:00:00:00:00 or FF:FF:FF:FF:FF:FF.

    By this command: macchanger --mac 00:00:00:00:00:00 wlan0

    When i try to do this the error message is like this

    ERROR: Can't change MAC: interface up or not permission: Cannot assign requested adress

    But the interface is down (I know that sure)

    2.

    Now, I wan't to change my mac address to 01:00:5E:00:00:01.

    By the same command and i get the same error message.

    But if I change it to 00:00:00:00:00:01 --> than is their no problem.

    So if anyone can help me by this questions, plz let me know.


    Thanx in Advance



    PS: The network card is an Alfa Awus 036H - Backtrack 5 KDE 32bit - VmWare fusion 3.1.2 - Macbook Pro 15" (medio 2010)

    Sorry for the English can't write it that good.

  2. #2
    Just burned his ISO addyall's Avatar
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    Default Re: Error during changing MAC address Backtrack 5

    Quote Originally Posted by ToonVA View Post

    1.

    First of all, I want to know why I can't chage my mac address to for exapmle 00:00:00:00:00:00 or FF:FF:FF:FF:FF:FF.

    By this command: macchanger --mac 00:00:00:00:00:00 wlan0

    When i try to do this the error message is like this

    ERROR: Can't change MAC: interface up or not permission: Cannot assign requested adress

    But the interface is down (I know that sure)
    Well I know any broadcast packet (a packet stating to every wireless device "Hey! I'm a wireless AP! Heres my info!) from any wireless access point has the MAC address of FF:FF:FF:FF:FF:FF. So for lack of understanding and a better definition on my part, being able to change your MAC address to FF:FF:FF:FF:FF:FF would make anything you tried to do afterwards go bonkers.

    2.

    Now, I wan't to change my mac address to 01:00:5E:00:00:01.

    By the same command and i get the same error message.

    But if I change it to 00:00:00:00:00:01 --> than is their no problem.

    So if anyone can help me by this questions, plz let me know.
    I think this problem could possibly be because of some type of "class" conflict. I have absolutely no clue though, just a guess.

  3. #3
    Junior Member dec1bel's Avatar
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    Default Re: Error during changing MAC address Backtrack 5

    I know you can't choose ff:ff:ff:ff:ff:ff because it's the broadcast address and you can't choose 00:00:00:00:00:00 because it's reserved for devices with no configured mac address (or so I understand), but I'm not sure why you cannot change it to 01:00:5e:00:00:01. I tried it out just to see and I can change it with no problem.

  4. #4
    Very good friend of the forum maverik35's Avatar
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    Default Re: Error during changing MAC address Backtrack 5

    Try to bring down the iface, in your case it would be wlan0..
    Ifconfig wlan0 down
    macchanger -m xx:xx:xx:xx:xx:xx wlan0
    ifconfig wlan0 up
    Check it with ifconfig: ifconfig wlan0

  5. #5
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    Default

    Ok, thank you

    But why can't I choose the MAC adress of an existing client? (the mac adress that I posted early).

    That is so weird.

    I checked it with some other Mac adresses.

    And i can't even take 11:11:11:11:11:11 - 01:01:01:01:01:01 - 01:01:01:01:01:02


    Is this a backtrack problem or is my Alfa network card broken?

    I found some interessting things

    http://www.eric-a-hall.com/articles/19990517ncw1.html

    Read this and now i know why I can't choose MAC 01:00:5e:00:00:01


    Some network topologies provide unique multicast addresses at the MAC layer. These Layer 2 addresses can be mapped to Class D IP addresses. For instance, Ethernet offers a variety of multicast group addresses ranging from "01:00:5e:00:00:00" to "01:00:5e:7f:ff: ff." These addresses can be mapped to the Class D addresses, so that any traffic for "01:00:5e:00:00:01" is destined for the Class D address of "224.0.0.1."



    That explains some things but not all, I still can't spoof to some MAC adresses.
    Last edited by g0tmi1k; 10-07-2011 at 09:34 AM. Reason: Merged

  6. #6
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    Default Re: Error during changing MAC address Backtrack 5

    Try using 00:11:22:33:44:55 It works for me doing the exact same thing your doing


    and just an idea try quitting out of everything that could be connected to a network or the internet

  7. #7
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    Default Re: Error during changing MAC address Backtrack 5

    Go with what nooby said plus you need to take down the interface before issuing this command for it to update.

    Here is a good write up:
    http://www.debianadmin.com/change-yo...l-address.html

  8. #8
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    Default Re: Error during changing MAC address Backtrack 5

    I think what this address reserved.
    Check this: http://wiki.wireshark.org/Gratuitous_ARP

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