After releasing the video tutorial for installing Call Manager 5/6 in VMWare, I received a comment asking how to change the MAC address on the Virtual server. The same person, (DrM) later posted another comment confirming that he had actually changed the address in the Linux OS. I had tried changing the MAC in VMWare with version 5.x but eventually gave up. This tutorial will show you how to change the MAC address in order to duplicate a production environment within VMWare. Without changing the MAC address, it is not possible to completely replicate your CUCM environment in a test lab because the license files are attached to the MAC address.



WARNING: This should not be performed on a Production System! I am not responsible for any damages. Use at your own risk and in a testing environment only!

  1. Boot the CUCM server with CentOS 5.1 Disk1
  2. Type ‘linux rescue’ at the boot: prompt
  3. Use the chroot command to change the root to the CUCM partition
    Type 'chroot /mnt/sysimage'
  4. Edit the eth0 configuration file
    vim /etc/sysconfig/network-scripts/ifcfg-eth0
  5. Add or change the MACADDR variable in the ifcfg-eth0 file.
    MACADDR=00:11:22:33:44:55
  6. Save and close (or write and quit) with the ‘:wq’ option inside vim
  7. Edit the hardware config file
    vim /etc/sysconfig/hwconf
  8. Change the ‘network.hwaddr’ variable
    network.hwaddr: 00:11:22:33:44:55
  9. Save and close (or write and quit) with the ‘:wq’ option inside vim
  10. Exit Linux rescue mode
  11. Login with CUCM administation account
  12. Use cli to verify the mac address has been changed

  13. show network eth0 detail

  14. You can also check the new mac address in the CUCM OS Administration gui

  15. Show > Network

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