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Why the default eth0 interface is down by default on CentOS?

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http://unix.stackexchange.com – I am already a little bit familiar with Linux distros like Debian or Ubuntu (yeah, very similar) but I wanted to try Red Hat based - CentOS 6.2 . I have installed it on my Windows 7 host in virtualBox and tried to play with it a little. I have same across a small problem, namely : the default eth0 interface is down by default. I use the option with NAT ( the virtual machine is 'behind' the host ). Even if I bring the interface up with ifconfig eth0 up it does not work right away. I get this after bringing the interface up: What should be done more to configure the network on CentOS machi (HowTos)

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Submitted by missing on 04/18/2012 – Made popular on 04/18/2012

Stories similar to Why the default eth0 interface is down by default on CentOS?

So this has been driving me nuts for a good couple of hours, so I thought I'd ask about it here (let me know if there's a better forum for this question).

I have a CentOS Virtual Machine on ESXi. I was trying to configure the network interface because it wasn't working, so I changed the file /etc/sysconfig/network-scripts/ifcfg-eth0 to the right IP address/gateway/netmask/MAC ID etc.

My Ubuntu Server has one physical interface eth0. I want to assign 3 ip's (different subnets) to the server. I cannot use the default virtual interface creation tools like ifconfig or ip addr add (e.g. eth0:0) because for each of those 3 ip's I need to specify a default gateway.

I have created 3 virtual interface on a Linux system, using different IP.

I have a software doing requests to a server but it use the default interface, eth0.

Is it possible to execute a software using another ip/interface temporarily ? Like eth0:1 ?

Something like :

USE_INTERFACE=eth0:1 node test.js

Thanks

Current situation:

I have a host running 3 virtual machines. One IP for eth0 (xxx.xxx.xxx.239) and one additional for eth0:1 (yyy.yyy.yyy.35).

I've just installed Centos 6.3 and I'm having trouble with my eth0 connection.

After I installed Centos 6.3 there was no eth0 file, so I made one.

inside my eth0 file I have:

DEVICE=eth0 IPADDR=xxx.xxx.x.xxx NETMASK=xxx.xxx.xxx.x ONBOOT=yes BOOTPROTO=static HWADDR=xx..... NM_CONTROLLED=no

When I run the cmd

# service network start

it brings up the loopback interface and the eth0 interface

Virtualbox centos no eth0 1 year 18 weeks ago

just installed a fresh centos-minimal and i can not get bridged network to work or any of the networks not even in host-only mode. when you run ifconfig there is no eth0 only a lo,

also when you cat /etc/sysconfig/network-scripts/ifcfg-eth0

DEVICE="eth0" HWADDR="08:00:27:FE:D5:10" NM_CONTROLLED="yes" ONBOOT="no"

Hi guys !I have a problem in configuring an interface in Centos 6. I have one Onboard Network Interface and one USB to RJ45 Network Interface (eth0 and eht1).To configure st... [by fontsix]

On debian squeeze, I setup a bridge based on eth0.

I have a PPPoE connection on my Linux Machine (CentOS kernal 2.6.32) as a client, so that when I setup this connection, another virtual tunnel interface comes up, i.e., ppp0

This connection is setup over existing the physical interface eth0.