[CentOS] Traditional network interface naming scheme vs. persistent naming

[Les Mikesell]

On Wed, Feb 4, 2015 at 11:23 AM, Niki Kovacs <info at microlinux.fr> wrote:
> Hi,
>
> I'm currently experimenting with CentOS 7 in order to get a grasp of
> everything that's new.
>
> After having read the FAQ entry on network interface names, I decided to
> revert to the tradictional interface naming scheme by adding the relevant
> kernel options to the bootloader. This went well, I have now two interfaces
> names 'eth0' and 'eth1' as expected.
>
> In my office I have another server with two network interface cards, running
> Slackware64 14.1. On a stock Slackware installation, as soon as there is
> more than one NIC, the system creates a file
> /etc/udev/rules.d/70-persistent-net.rules, which looks like this:
>
>  # PCI device 0x8086:/sys/devices/pci0000:00/0000:00:02.0/0000:02:00.0
> (e1000e)
> SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*",
> ATTR{address}=="2c:27:d7:15:54:a1", ATTR{dev_id}=="0x0", ATTR{type}=="1",
> KERNEL=="eth*", NAME="eth0"
>
> # PCI device 0x8086:/sys/devices/pci0000:00/0000:00:04.0/0000:03:00.0
> (e1000e)
> SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*",
> ATTR{address}=="00:22:64:8a:4c:c2", ATTR{dev_id}=="0x0", ATTR{type}=="1",
> KERNEL=="eth*", NAME="eth1"
>
> Usually I have a 50 % chance of getting the network interface right (well,
> according to Murphy, I have more like a 100 % chance of getting it wrong the
> first time :oD). In that case, I simple edit the 70-persistent-net.rules
> file, permutate the "eth0" and "eth1" entries and then reboot.
>
> How would I go about that under CentOS with traditional interface names? The
> 70-persistent-net.rules file doesn't exist. Do I have to create it from
> scratch?
>

Probably more than you want to know about this weirdness and the
multiple ways of doing it:

https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/pdf/Networking_Guide/Red_Hat_Enterprise_Linux-7-Networking_Guide-en-US.pdf

-- 
  Les Mikesell
    lesmikesell at gmail.com