Re-Detect Network Interface Card in Ubuntu 13.04 and Centos 6.4

After making changes to the Network Interface Card (NIC), and when you run the command ifconfig, network adapters can't up. No visible interface ethernet (eth. ..), only the loopback interface (lo) is visible.

In ubuntu

If using the command "service networking restart", not seen the error. Use the command "ifup eth0", then you will get the error.

Ifup eth0

Internet Systems Consortium DHCP Client 4.2.4

Copyright 2004-2012 Internet Systems Consortium.

All rights reserved.

For info, please visit https://www.isc.org/software/dhcp/

Cannot find device "eth0"

Error getting hardware address for "eth0": No such device

Failed to bring up ngeri-eth.

In centos

Service network restart

Shutting down loopback interface:                          [  OK  ]

Bringing up loopback interface:                            [  OK  ]

Bringing up interface eth0:  Device eth0 does not seem to be present, delaying initialization.                                                           [FAILED]

How to fix.
in Ubuntu 13.04

The operating system automatically detects the new hardware. In this case, the new network interface card (NIC) according the mac address. Look at file /etc/udev/rules.d/70-persistent-net.rules

vim  /etc/udev/rules.d/70-persistent-net.rules

# PCI device 0x1022:/sys/devices/pci0000:00/0000:00:03.0 (pcnet32)

SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="08:01:55:03:59:44", ATTR{dev_id}=="0x0", ATTR{type}=="1", KERNEL=="eth*", NAME="eth0"

# PCI device 0x1022:/sys/devices/pci0000:00/0000:00:03.0 (pcnet32)

SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="08:00:27:e7:55:de", ATTR{dev_id}=="0x0", ATTR{type}=="1", KERNEL=="eth*", NAME="eth1"

The new network interface adapter apparently is eth1 (NAME = "eth1"). NAME = "eth1" in the file /etc/udev/rules.d/cat 70-persistent-net.rules, is to reconfigure the file /etc/network/interfaces. NAME = "eth1" should be the same as in /etc/network/interfaces.

vim /etc/network/interfaces

# The loopback network interface

auto lo

iface lo inet loopback

# The primary network interface.

#Eth1 according name="eth1" in /etc/udev/rules.d/cat 70-persistent-net.rules

auto eth1

iface eth1 inet dhcp

save and reboot

in Centos

Same as Ubuntu, in Centos look at /etc/udev/rules.d/70-persistent-net.rules. Then, there are a little different. Look at /etc/sysconfig/network-script/. Change the file ifcfg-eth0 to ifcfg-eth1. And edit the content of the file. Change device according the correct network adapter device, and comment or remove the mac address.

cd  /etc/sysconfig/network-scripts

cp ifcfg-eth0 ifcfg-eth1

vim ifcfg-eth1

DEVICE=eth1

TYPE=Ethernet

UUID=094d6b99-b48e-45ac-b3d8-edc06b49c3aa

ONBOOT=yes

NM_CONTROLLED=yes

BOOTPROTO=dhcp

#HWADDR=08:00:27:c5:d1:42

USERCTL=no

IPV6INIT=no

PEERDNS=yes

save and reboot

Check your network adapter with command ifconfig eth1.It should be like this below,

Ifconfig eth1

Eth1      Link encap:Ethernet  HWaddr 08:00:27:e7:55:de

          inet addr:10.1.1.236  Bcast:10.1.1.255  Mask:255.255.255.0

          inet6 addr: fe80::a00:27ff:fee7:55de/64 Scope:Link

          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1

          RX packets:257 errors:0 dropped:0 overruns:0 frame:0

          TX packets:124 errors:0 dropped:0 overruns:0 carrier:0

          collisions:0 txqueuelen:1000

          RX bytes:23407 (23.4 KB)  TX bytes:12358 (12.3 KB)

          Interrupt:19 Base address:0xd020

Change the name of ethernet (network interface card) with unique name

How if you want to change eth1 to a unique name, for example ngeri-eth. Go to file /etc/udev/rules.d/70-persistent-net.rules. Edit the file, and change NAME of the correct interface. Look at example below.

vim  /etc/udev/rules.d/70-persistent-net.rules

# 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.

# PCI device 0x1022:/sys/devices/pci0000:00/0000:00:03.0 (pcnet32)

SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="08:01:55:03:59:44", ATTR{dev_id}=="0x0", ATTR{type}=="1", KERNEL=="eth*", NAME="eth0"

# PCI device 0x1022:/sys/devices/pci0000:00/0000:00:03.0 (pcnet32)

SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="08:00:27:e7:55:de", ATTR{dev_id}=="0x0", ATTR{type}=="1", KERNEL=="eth*", NAME="ngeri-eth"

And then edit the configuration network interface card.

In Ubuntu

Edit file /etc/network/interfaces

vim  /etc/network/interfaces

# This file describes the network interfaces available on your system

# and how to activate them. For more information, see interfaces(5).

           

# The loopback network interface

auto lo

iface lo inet loopback

           

# The primary network interface

auto ngeri-eth

iface ngeri-eth inet dhcp

save and reboot

In centos

cd  /etc/sysconfig/network-scripts

cp ifcfg-eth1 ifcfg-ngeri-eth

vim ifcfg-ngeri-eth

DEVICE=eth1

TYPE=Ethernet

UUID=094d6b99-b48e-45ac-b3d8-edc06b49c3aa

ONBOOT=yes

NM_CONTROLLED=yes

BOOTPROTO=dhcp

#HWADDR=08:00:27:c5:d1:42

USERCTL=no

IPV6INIT=no

PEERDNS=yes

save and reboot

Chek the interface network, with command "ifconfig". Then the result should be like this.

lo        Link encap:Local Loopback

          inet addr:127.0.0.1  Mask:255.0.0.0

          inet6 addr: ::1/128 Scope:Host

          UP LOOPBACK RUNNING  MTU:65536  Metric:1

          RX packets:0 errors:0 dropped:0 overruns:0 frame:0

          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0

          collisions:0 txqueuelen:0

          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

ngeri-eth Link encap:Ethernet  HWaddr 08:00:27:e7:55:de

          inet addr:10.1.1.236  Bcast:10.1.1.255  Mask:255.255.255.0

          inet6 addr: fe80::a00:27ff:fee7:55de/64 Scope:Link

          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1

          RX packets:1794 errors:11 dropped:0 overruns:0 frame:0

          TX packets:140 errors:0 dropped:0 overruns:0 carrier:0

          collisions:0 txqueuelen:1000

          RX bytes:124528 (124.5 KB)  TX bytes:14140 (14.1 KB)

          Interrupt:19 Base address:0xd020

Note: If you delete the file /etc/udev/rules.d/70-persistent-net.rules, and then restart. After restart, the file /etc/udev/rules.d/70-persistent-net.rules, automatically re-created. If there are a lot of network interface card that are detected then a few lines of configuration will be created in /etc/udev/rules.d/70-persistent-net.rule file. And the NAME of interface ethernet is sequential, starting from eth0, eth1 and so on.