[[linux_wiki:persistent_interface_name]]

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

Enable BIOS Device Names

Install biosdevname

yum install biosdevname

Enable biosdevname as a parameter passed to the kernel

  • EL7
    vim /etc/default/grub
     
    # Add to GRUB_CMDLINE_LINUX values
    GRUB_CMDLINE_LINUX="biosdevname=1"
  • EL6
    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

Update Grub config

  • EL 7
    grub2-mkconfig -o /boot/grub2/grub.cfg
  • EL 6: manual changes already made above.
  • Ubuntu
    update-grub

The following preference order is used for biosdevname:

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

  • linux_wiki/persistent_interface_name.txt
  • Last modified: 2019/05/26 03:50
  • (external edit)