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What's the use of /etc/sysconfig/network-scripts/ifcfg-eth* files ? In some cases ifconfig lists the interface eth0 but I don't find the corresponding ifcfg-eth0 file whereas in other instances if I create the ifcfg-eth1 file and restart the network like service network restart - this interface is not listed in ifconfig ??

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first check in ifconfig -a then it will show all interfaces, then configure accordingly – Rahul Patil Mar 18 '13 at 8:47
What I am trying to understand here is that does ifconfig use these files ? Who else uses these ifcfg-eth* files ? – Shraddha Mar 18 '13 at 8:53
@Shrddha I have updated and explain ans – Rahul Patil Mar 18 '13 at 8:57
for more info run man ifconfig – Rahul Patil Mar 18 '13 at 8:58

In RHEL/CentOS based system,

all Interface/Ipaddress settings saved in /etc/sysconfig/network-scripts/ifcfg-eth* the same you can find /etc/network/interfaces in debain/ubunt based OS

ifconfig If no arguments are given, ifconfig displays the status of the currently active interfaces, you can list all interface by using /sbin/ifconfig -a command and configure it.

when you restart service then it will reload settings from /etc/sysconfig/network-scripts/ifcfg-eth* and shows in ifconfig

if you are able to configure it , then just use ncurses tools using below command


Note:- if neat-tui not work then you need to install system-config-network-tui package.

or from GUI login system-config-network

to active interface below option is must be in /etc/sysconfig/network-scripts/ifcfg-eth*


Or you can up interface using

ifup eth1
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