In Red Hat Enterprise Linux (RHEL) and other Red Hat-based distributions, network interface configuration files are typically located in the /etc/sysconfig/network-scripts directory.
The configuration files for each network interface are named according to the interface name, with a .ifcfg suffix. For example, the configuration file for the eth0 interface would be named eth0.ifcfg.
In the configuration files, you can specify various settings for the interface, such as the IP address, netmask, gateway, and DNS servers. Here is an example of the contents of a typical network interface configuration file:
DEVICE=eth0 BOOTPROTO=static ONBOOT=yes IPADDR=192.168.0.100 NETMASK=255.255.255.0 GATEWAY=192.168.0.1 DNS1=8.8.8.8
To configure a network interface in RHEL, you can edit the appropriate configuration file and specify the desired settings. You can then use the ifup command to bring the interface up and apply the new settings, or the ifdown command to bring the interface down.
It is generally a good idea to make a backup copy of the configuration files before making any changes, in case you need to restore the original settings.