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Automatic MAC with GNU/Linux VMs

When an NIC is configured to use an Automatic MAC, a random MAC is generated for it, with our assigned prefix 2c:c2:60.

When your GNU/Linux VM boots, it detects a change in MAC and therefore assigns a new name, such as eth1. As a result, your VM does have network connectivity.

For this reason, before enabling Automatic MAC, some system files should be updated:

  1. In RHEL/CentOS/Fedora/etc only: in all files /etc/sysconfig/network/scripts/ifcfg-eth*, remove the UUID="..." and HWADDR="..." lines for the code.
  2. Remove all rules in /etc/udev/rules.d/70-persistent-net.rules (removing the file is also okay.)
  3. Copy /lib/udev/rules.d/75-persistent-net-generator.rules to /etc/udev/rules.d/75-persistent-net-generator.rules.
  1. In /etc/udev/rules.d/75-persistent-net-generator.rules, after the lines:
    # match interface type
    ENV{MATCHIFTYPE}="$attr{type}"
    add:
    # ignore KVM virtual interfaces
    ENV{MATCHADDR}=="52:54:00:*", GOTO="persistent_net_generator_end"

 

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