# Interfaz MAC order **URL:** \ **Category:** Rocky Linux Help & Support\ **Created:** [April 2, 2024, 12:16pm UTC](https://forums.rockylinux.org/t/interfaz-mac-order/13419 "2024-04-02T12:16:40Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![dominTxomin](https://sea2.discourse-cdn.com/flex020/user_avatar/forums.rockylinux.org/domintxomin/32/2727_2.png) [@dominTxomin](https://forums.rockylinux.org/u/dominTxomin)\ **Post date:** [April 2, 2024, 12:16pm UTC](https://forums.rockylinux.org/t/interfaz-mac-order/13419/1 "2024-04-02T12:16:41Z")
Good afternoon The ROCKY LINUX operating system recognizes my network interfaces but it recognizes them in this order: eth0: 00:00:00:00:aa:20 eth1: 00:00:00:00:aa:21 eth2: 00:00:00:00:aa:22 And I want it to be this: eth0: 00:00:00:00:aa:22 eth1: 00:00:00:00:aa:21 eth2: 00:00:00:00:aa:20 I can’t get it to work. I have tried to generate the file /etc/udev/rules.d/70-persistent-net.rules: SUBSYSTEM==“net”, ACTION==“add”, DRIVERS==“?_“, ATTR{address}==“00:00:00:00:aa:22”, NAME=“eth0” SUBSYSTEM==“net”, ACTION==“add”, DRIVERS==”?_”, ATTR{address}==“00:00:00:00:aa:21”, NAME=“eth1” SUBSYSTEM==“net”, ACTION==“add”, DRIVERS==“?\*”, ATTR{address}==“00:00:00:00:aa:20”, NAME=“eth2” I have modified the files: /etc/sysconfig/network-scripts/ifcfg-eth0, ifcfg-eth1 and ifcfg-eth2 putting HWADDR with the MAC And nothing, there is no way. Any suggestions? Thank you ---
**Author:** ![jlehtone](https://avatars.discourse-cdn.com/v4/letter/j/e9a140/32.png) [@jlehtone](https://forums.rockylinux.org/u/jlehtone)\ **Post date:** [April 2, 2024, 12:18pm UTC](https://forums.rockylinux.org/t/interfaz-mac-order/13419/2 "2024-04-02T12:18:33Z")
> [@dominTxomin](#): > > I want it to be this Why? Why does it matter what the names are? ---
**Author:** ![dominTxomin](https://sea2.discourse-cdn.com/flex020/user_avatar/forums.rockylinux.org/domintxomin/32/2727_2.png) [@dominTxomin](https://forums.rockylinux.org/u/dominTxomin)\ **Post date:** [April 2, 2024, 12:26pm UTC](https://forums.rockylinux.org/t/interfaz-mac-order/13419/3 "2024-04-02T12:26:36Z")
eth0 is on the motherboard and eth1 and eth2 go on an additional pci with two interfaces. I want to control the order so that eth0 is always the one on the motherboard whether the additional PCI is plugged in or not. ---
**Author:** ![jlehtone](https://avatars.discourse-cdn.com/v4/letter/j/e9a140/32.png) [@jlehtone](https://forums.rockylinux.org/u/jlehtone)\ **Post date:** [April 2, 2024, 12:47pm UTC](https://forums.rockylinux.org/t/interfaz-mac-order/13419/4 "2024-04-02T12:47:43Z")
EL8 and EL9 should use persistent names by default. That is not names like “eth0”. [https://access.redhat.com/documentation/en-us/red\_hat\_enterprise\_linux/9/html/configuring\_and\_managing\_networking/consistent-network-interface-device-naming\_configuring-and-managing-networking](https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/9/html/configuring_and_managing_networking/consistent-network-interface-device-naming_configuring-and-managing-networking) > [@dominTxomin](#): > > I have modified the files: /etc/sysconfig/network-scripts/ifcfg-eth0, ifcfg-eth1 and ifcfg-eth2 putting HWADDR with the MAC > > And nothing, there is no way. The EL9 does not use `/etc/sysconfig/network-scripts/ifcfg-*`, so I presume that you have Rocky 8. Docs might differ form EL9: [Chapter 1. Implementing consistent network interface naming Red Hat Enterprise Linux 8 | Red Hat Customer Portal](https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/configuring_and_managing_networking/consistent-network-interface-device-naming_configuring-and-managing-networking#doc-wrapper) I have not seriously looked at ifcfg-files in years (since ~EL7.3); I do use NetworkManager to do the config. On initial install the Anaconda installer generates connections for each interface – at least on some conditions. The installer adds `802-3-ethernet.mac-address`, but does not set `connection.interface-name` for a connection. That connection is bound to interface with that MAC, regardless of the name. If one adds connection manually with `nmcli con add`, then one must supply `ifname`. It is possible to later add `802-3-ethernet.mac-address` and remove the `connection.interface-name` with `nmcli con mod`. When system boots and NetworkManager activates connections, it does pass the current name of interface to FirewallD (along with value of `connection.zone`) and FirewallD uses that name when creating rules. * * * Therefore, (1) names are not important for the NetworkManager+FirewallD setup, and (2) the name of the interface on the motherboard should persist, stay same, whether addon card is there or not. Why does you system get those `eth[012]` names to begin with? Is there some other configuration that desperately depends on names? ---
**Author:** ![dominTxomin](https://sea2.discourse-cdn.com/flex020/user_avatar/forums.rockylinux.org/domintxomin/32/2727_2.png) [@dominTxomin](https://forums.rockylinux.org/u/dominTxomin)\ **Post date:** [April 3, 2024, 2:30pm UTC](https://forums.rockylinux.org/t/interfaz-mac-order/13419/5 "2024-04-03T14:30:59Z")
Hello thank you very much. I have explained myself poorly. My problem is not the names but the order of the interfaces. I have Rocky 8. I have a shared application with old versions of CentOS and that’s why I stick with eth0, eth1, etc. But that, the name of the interfaces seems fine to me and I have no problem with that. I explain again what I have and what I want to achieve: - I have computers with only the two network interfaces on the motherboard and I have other computers to which a PCI with 2 additional network interfaces is added. What happens to me on my RL8: - Devices only with the two network interfaces on the motherboard: eth0 and eth1 (Ok, correct) - Equipment with both motherboard + additional PCI network card: eth0, eth1, eth2 and eth3 (eth0 and eth1 are those of the additional PCI and eth2 and eth3 are those of the motherboard) - What I want is that the motherboard interfaces are always the first (eth0 and eth1) and the rest (if they exist) are eth2, eth3 In the old versions (I am talking about CentOS 6 and 7) it worked for me by generating the file /etc/udev/rules.d/70-persistent-net.rules. In that file I related the MAC to the name of the interface (eth0, eth1, etc) but now in Rocky Linux 8.7 this has not worked for me (I’m also missing something else). I don’t know how to do it in RL8. Anyway, I’m going to read what you gave me in case it helps me. ---
**Author:** ![jlehtone](https://avatars.discourse-cdn.com/v4/letter/j/e9a140/32.png) [@jlehtone](https://forums.rockylinux.org/u/jlehtone)\ **Post date:** [April 3, 2024, 2:53pm UTC](https://forums.rockylinux.org/t/interfaz-mac-order/13419/6 "2024-04-03T14:53:22Z")
> [@dominTxomin](#): > > My problem is not the names but the order of the interfaces. I disagree with that description. You don’t actually care about the “order” as long as that one interface on the motherboard _always gets the same name_ – “eth0”. Persistently. > [@dominTxomin](#): > > I have a shared application with old versions of CentOS and that’s why I stick with eth0 In other words, you do have an application for which you have to tell the name of interface. (Or worse yet, one that is hardcoded with name “eth0”.) That might add requirement that the name has to be not only persistent, but “eth0” too. Unfortunately. * * * The old eth_N_ styles have _never_ been officially persistent. I had CentOS 7 (VM), where names “eth0” and “eth1” did swap interfaces on _every_ boot. That is when I started to bind NM connections with MAC. Looking at my system: ```auto dmesg | grep eth0 [1.776101] e1000e 0000:00:1f.6 eth0: (PCI Express:2.5GT/s:Width x1) 10:..:42 [1.776104] e1000e 0000:00:1f.6 eth0: Intel(R) PRO/1000 Network Connection [1.776197] e1000e 0000:00:1f.6 eth0: MAC: 13, PHY: 12, PBA No: FFFFFF-0FF [1.777186] e1000e 0000:00:1f.6 eno1: renamed from eth0 ``` The device `eno1` had initially name `eth0`. You want to rename some interface to `eth0`. At that moment there is probably some other interface with name `eth0`, which probably creates name conflict that leads to failure? ---
**Author:** ![dominTxomin](https://sea2.discourse-cdn.com/flex020/user_avatar/forums.rockylinux.org/domintxomin/32/2727_2.png) [@dominTxomin](https://forums.rockylinux.org/u/dominTxomin)\ **Post date:** [April 15, 2024, 9:52am UTC](https://forums.rockylinux.org/t/interfaz-mac-order/13419/7 "2024-04-15T09:52:57Z")
Hello. I see the ethx interfaces correctly → ifconfig eth0: flags=4099\ mtu 1500 ether 00:00:00:00:aa:20 txqueuelen 1000 (Ethernet) RX packets 0 bytes 0 (0.0 B) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 0 bytes 0 (0.0 B) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 device interrupt 16 eth1: flags=4099\ mtu 1500 ether 00:00:00:00:aa:21 txqueuelen 1000 (Ethernet) RX packets 0 bytes 0 (0.0 B) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 0 bytes 0 (0.0 B) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 device interrupt 17 eth2: flags=4099\ mtu 1500 ether 00:00:00:00:aa:22 txqueuelen 1000 (Ethernet) RX packets 0 bytes 0 (0.0 B) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 0 bytes 0 (0.0 B) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 device interrupt 16 What I want to do in Rocky Linux 8.7 is make eth2 be eth0 and eth0 be eth2 I have configured this: cat ifcfg-eth0 TYPE=Ethernet PROXY\_METHOD=none BROWSER\_ONLY=no DEFROUTE=yes IPV4\_FAILURE\_FATAL=no IPV6INIT=no IPV6\_AUTOCONF=yes IPV6\_DEFROUTE=yes IPV6\_FAILURE\_FATAL=no IPV6\_ADDR\_GEN\_MODE=eui64 NAME=eth0 DEVICE=eth0 ONBOOT=no BOOTPROTO=static MACADDR=00:00:00:00:aa:22 cat ifcfg-eth2 TYPE=Ethernet PROXY\_METHOD=none BROWSER\_ONLY=no DEFROUTE=yes IPV4\_FAILURE\_FATAL=no IPV6INIT=no IPV6\_AUTOCONF=yes IPV6\_DEFROUTE=yes IPV6\_FAILURE\_FATAL=no IPV6\_ADDR\_GEN\_MODE=eui64 NAME=eth2 DEVICE=eth2 ONBOOT=no BOOTPROTO=static MACADDR=00:00:00:00:aa:20 I can’t change the order ---
**Author:** ![jlehtone](https://avatars.discourse-cdn.com/v4/letter/j/e9a140/32.png) [@jlehtone](https://forums.rockylinux.org/u/jlehtone)\ **Post date:** [April 15, 2024, 11:25am UTC](https://forums.rockylinux.org/t/interfaz-mac-order/13419/8 "2024-04-15T11:25:49Z")
> [@dominTxomin](#): > > What I want to do in Rocky Linux 8.7 is make eth2 be eth0 and eth0 be eth2 Lets presume that the system starts with `eth0 eth1 eth2` Now, some system – be it udev, systemd, initscripts, or whatever – has a rule: _Rename eth0 eth2_ That must fail, because you can’t create `eth2` while there is already another `eth2`. _If_ there were two orders: _Rename eth0 mythird_ _Rename eth2 eth0_ and _if_ they were used in that _order_, then there would not be name conflicts. ---
**Author:** ![system](https://us1.discourse-cdn.com/flex020/uploads/rockylinux/original/1X/91b7219eec10e30013422e4df76c1d898711a5d5.svg) [@system](https://forums.rockylinux.org/u/system)\ **Post date:** [June 14, 2024, 11:26am UTC](https://forums.rockylinux.org/t/interfaz-mac-order/13419/9 "2024-06-14T11:26:31Z")
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