udev: renaming an ethernet interface without reboot

In English (para português, olhe abaixo)

To rename a network interface in Linux, switching from eth0 to eth1 and from eth1 to eth0, you should follow some steps.

1. Edit the /etc/udev/rules.d/70-persistent-net.rules file.

See bellow an example of the file:

# This file was automatically generated by the /lib/udev/write_net_rules
# program, run by the persistent-net-generator.rules rules file.
#
# You can modify it, as long as you keep each rule on a single
# line, and change only the value of the NAME= key.

# USB device 0x:0x (dm9601)
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="00:e0:4c:53:44:58", ATTR{dev_id}=="0x0", ATTR{type}=="1", KERNEL=="eth*", NAME="eth0"

# USB device 0x:0x (rt73usb)
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="00:1d:0f:df:59:c6", ATTR{dev_id}=="0x0", ATTR{type}=="1", KERNEL=="wlan*", NAME="wlan0"

# PCI device 0x10ec:0x8139 (8139too)
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="00:08:54:6a:3a:cd", ATTR{dev_id}=="0x0", ATTR{type}=="1", KERNEL=="eth*", NAME="eth1"

2. Change eth0 and eth1 names at end of lines.

See bellow the final situation (showing the relevant parts only):

[...]
# USB device 0x:0x (dm9601)
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="00:e0:4c:53:44:58", ATTR{dev_id}=="0x0", ATTR{type}=="1", KERNEL=="eth*", NAME="eth1"

[...]
# PCI device 0x10ec:0x8139 (8139too)
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="00:08:54:6a:3a:cd", ATTR{dev_id}=="0x0", ATTR{type}=="1", KERNEL=="eth*", NAME="eth0"

3. Look at lines and search the kernel modules used by each network interface. We have dm9601 for eth1 and 8139too for eth0.

4. Remove and reload the kernel modules. You can use these commands:

# modprobe -r dm9601 8139too
# modprobe -a dm9601 8139too

5. When you load a kernel module, udev reads the associated config file and loads the rules.

See the results:

root@canopus:~# ifconfig
eth0      Link encap:Ethernet  Endereço de HW 00:08:54:6a:3a:cd  
          inet end.: 192.168.1.180  Bcast:192.168.1.255  Masc:255.255.255.0
          endereço inet6: fe80::208:54ff:fe6a:3acd/64 Escopo:Link
          UP BROADCASTRUNNING MULTICAST  MTU:1500  Métrica:1
          RX packets:994 errors:0 dropped:0 overruns:0 frame:0
          TX packets:1151 errors:0 dropped:0 overruns:0 carrier:0
          colisões:0 txqueuelen:1000 
          RX bytes:663937 (648.3 KiB)  TX bytes:290276 (283.4 KiB)
          IRQ:22 

eth1      Link encap:Ethernet  Endereço de HW 00:e0:4c:53:44:58  
          endereço inet6: fe80::2e0:4cff:fe53:4458/64 Escopo:Link
          UP BROADCASTMULTICAST  MTU:1500  Métrica:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          colisões:0 txqueuelen:1000 
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

lo        Link encap:Loopback Local  
          inet end.: 127.0.0.1  Masc:255.0.0.0
          endereço inet6: ::1/128 Escopo:Máquina
          UP LOOPBACKRUNNING  MTU:16436  Métrica:1
          RX packets:26345 errors:0 dropped:0 overruns:0 frame:0
          TX packets:26345 errors:0 dropped:0 overruns:0 carrier:0
          colisões:0 txqueuelen:0 
          RX bytes:16608459 (15.8 MiB)  TX bytes:16608459 (15.8 MiB)

Hope that helps.

In Portuguese

Para renomear uma interface de rede no Linux, alterando de eth0 para eth1 e de eth1 para eth0, você deve serguir alguns passos.

1. Edite o arquivo /etc/udev/rules.d/70-persistent-net.rules file.

Veja abaixo um exemplo do arquivo:

# This file was automatically generated by the /lib/udev/write_net_rules
# program, run by the persistent-net-generator.rules rules file.
#
# You can modify it, as long as you keep each rule on a single
# line, and change only the value of the NAME= key.

# USB device 0x:0x (dm9601)
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="00:e0:4c:53:44:58", ATTR{dev_id}=="0x0", ATTR{type}=="1", KERNEL=="eth*", NAME="eth0"

# USB device 0x:0x (rt73usb)
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="00:1d:0f:df:59:c6", ATTR{dev_id}=="0x0", ATTR{type}=="1", KERNEL=="wlan*", NAME="wlan0"

# PCI device 0x10ec:0x8139 (8139too)
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="00:08:54:6a:3a:cd", ATTR{dev_id}=="0x0", ATTR{type}=="1", KERNEL=="eth*", NAME="eth1"

2. Altere os nomes eth0 e eth1 no fim das linhas.

Veja abaixo a situação final (apenas as partes relevantes):

[...]
# USB device 0x:0x (dm9601)
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="00:e0:4c:53:44:58", ATTR{dev_id}=="0x0", ATTR{type}=="1", KERNEL=="eth*", NAME="eth1"

[...]
# PCI device 0x10ec:0x8139 (8139too)
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="00:08:54:6a:3a:cd", ATTR{dev_id}=="0x0", ATTR{type}=="1", KERNEL=="eth*", NAME="eth0"

3. Olhe as linhas e procure pelos módulos de kernel utilizados por cada interface de rede. No caso, temos dm9601 para eth1 e 8139too para eth0.

4. Remova e recarregue os módulos de kernel. Você poderá utilizar estes comandos:

# modprobe -r dm9601 8139too
# modprobe -a dm9601 8139too

5. Quando você carrega um módulo de kernel, o udev lê o arquivo de configuração relacionado e carrega as regras.

Veja os resultados:

root@canopus:~# ifconfig
eth0      Link encap:Ethernet  Endereço de HW 00:08:54:6a:3a:cd  
          inet end.: 192.168.1.180  Bcast:192.168.1.255  Masc:255.255.255.0
          endereço inet6: fe80::208:54ff:fe6a:3acd/64 Escopo:Link
          UP BROADCASTRUNNING MULTICAST  MTU:1500  Métrica:1
          RX packets:994 errors:0 dropped:0 overruns:0 frame:0
          TX packets:1151 errors:0 dropped:0 overruns:0 carrier:0
          colisões:0 txqueuelen:1000 
          RX bytes:663937 (648.3 KiB)  TX bytes:290276 (283.4 KiB)
          IRQ:22 

eth1      Link encap:Ethernet  Endereço de HW 00:e0:4c:53:44:58  
          endereço inet6: fe80::2e0:4cff:fe53:4458/64 Escopo:Link
          UP BROADCASTMULTICAST  MTU:1500  Métrica:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          colisões:0 txqueuelen:1000 
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

lo        Link encap:Loopback Local  
          inet end.: 127.0.0.1  Masc:255.0.0.0
          endereço inet6: ::1/128 Escopo:Máquina
          UP LOOPBACKRUNNING  MTU:16436  Métrica:1
          RX packets:26345 errors:0 dropped:0 overruns:0 frame:0
          TX packets:26345 errors:0 dropped:0 overruns:0 carrier:0
          colisões:0 txqueuelen:0 
          RX bytes:16608459 (15.8 MiB)  TX bytes:16608459 (15.8 MiB)

Espero que isso ajude.

5 comentários em “udev: renaming an ethernet interface without reboot”

Ironmaniaco quarta-feira, 11 abril 2012 em 23:49

Em outros casos, criando um alias diretamente em /etc/network/interfaces, caso a necessidade seja chamar a eth0 de int(interna) e a eth1 de ext(externa) por exemplo

As possibilidades são várias 😉
Eriberto sexta-feira, 13 abril 2012 em 11:16

Ironmaniaco, essa é uma possibilidade para outro caso. Não resolve o problema em questão.

[]s
Leo quarta-feira, 18 abril 2012 em 21:04

What about change wlan (wireless interface) logical name? Any tips? Thanks!
Eriberto sábado, 21 abril 2012 em 11:27

Leo, you can use the same process. Write new name and reload the kernel module.

Please, try it and tell us the results!

Regards.

In English (para português, olhe abaixo)

In Portuguese

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