For CentOS 7.5 run the following as root:
cd /etc/yum.repos.d/
wget https://download.opensuse.org/repositories/systemsmanagement:Ardana:8:CentOS/CentOS_7.5/systemsmanagement:Ardana:8:CentOS.repo
yum install netcfg
For CentOS 7.3 run the following as root:
cd /etc/yum.repos.d/
wget https://download.opensuse.org/repositories/systemsmanagement:Ardana:8:CentOS/CentOS_7.3/systemsmanagement:Ardana:8:CentOS.repo
yum install netcfg
For CentOS 7 run the following as root:
cd /etc/yum.repos.d/
wget https://download.opensuse.org/repositories/systemsmanagement:Ardana:8:CentOS/CentOS_7/systemsmanagement:Ardana:8:CentOS.repo
yum install netcfg