On 02/04/15 22:53, Niki Kovacs 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?
>
> Cheers,
>
> Niki Kovacs
Those are udev rules (which's now integrated with systemd in CentOS 7).
You don't have to create a new one, but you have to find the one. I
suggest reading up on the udev rules file.