====== Persistent Interface Name ======

**General Information**

Persistent network interface names prevent interfaces being renamed from "eth0" to "eth1" upon reboot.\\
Instead, a name based upon BIOS/firmware information can be used if available.

**Checklist**
  * Distro(s): Debian Based or Enterprise Linux

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====== Enable BIOS Device Names ======

Install biosdevname<code bash>yum install biosdevname</code>

Enable biosdevname as a parameter passed to the kernel
  * EL7<code bash>vim /etc/default/grub

# Add to GRUB_CMDLINE_LINUX values
GRUB_CMDLINE_LINUX="biosdevname=1"
</code>
  * EL6<code bash>vim /boot/grub/grub.conf

# Append biosdevname=1 to all kernel lines. Example:
kernel /vmlinuz-2.6.32-279.22.1.el6.x86_64 ro root=/dev/sda3 biosdevname=1
</code>

Update Grub config
  * EL 7<code bash>grub2-mkconfig -o /boot/grub2/grub.cfg</code>
  * EL 6: manual changes already made above.

  * Ubuntu<code bash>update-grub</code>

===== Naming Scheme Preference =====

The following preference order is used for biosdevname:
  - Firmware/BIOS index numbers for on board devices
    - Example: eno2
    - Not Available?: Fallback to number 2
  - Firmware/BIOS provided PCI Express slot index numbers
    - Example: ens2
    - Not Available?: Fallback to number 3
  - Physical Location of the connector
    - Example: enp3s0
    - Not Available?: Fallback to number 5
  - Interfaces MAC address (not used by default, but can be user selected)
    - Example: enx080027e468c1
    - Not Available?: Fallback to number 5
  - Traditional unpredictable naming
    - Example: eth0

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