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Here's what I got:

audrianore@HP-Mini-210-1000:~$ sudo airmon-ng stop eth1
[sudo] password for audrianore: 

Interface   Chipset     Driver

eth1        Unknown         wl (monitor mode disabled)

audrianore@HP-Mini-210-1000:~$ sudo ifconfig eth1 down
audrianore@HP-Mini-210-1000:~$ sudo macchanger --random eth1
Permanent MAC: 00:00:00:00:00:00 (Xerox Corporation)
Current   MAC: ee:68:56:21:3b:2a (unknown)
ERROR: Can't change MAC: interface up or not permission: Too many open files in system

I don't know why, the Chipset is Unknown, but that doesn't matter (I think).
I was just curious with macchanger's error.

What I did today are:

  1. sudo apt-get install build-essential
  2. sudo apt-get install libssl-dev
  3. sudo apt-get install aircrack-ng
  4. sudo apt-get install macchanger


02:00.0 Network controller: Broadcom Corporation BCM4312 802.11b/g LP-PHY (rev 01)

I've been googling, and I found out that this is a hardware problem (Broadcom).
Is there anything I can do with it?

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Which Ubuntu version? Which wifi card? – izx Jul 26 '12 at 15:26
Ubuntu version is on the tag. Wifi card, based on my lspci: 02:00.0 Network controller: Broadcom Corporation BCM4312 802.11b/g LP-PHY (rev 01) – Drie Jul 26 '12 at 15:31

To change your mac address you can try this:

  1. sudo service network-manager stop
  2. sudo ifconfig eth0 hw ether xx:xx:xx:xx:xx:xx - Here you have to add a mac address you want. If you are connecting to the Internet over a wireless connection, then replace "eth0" with "wlan0" (wlan1, wlan2, etc.)
  3. sudo service network-manager restart
  4. ifconfig - check is mac changed

You can read more here.

If this is a hardware problem, I'm not sure if it will work, but try.

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