Evaggelos Balaskas - System Engineer

First remove NetworkManager:

# systemctl stop NetworkManager

# systemctl disable NetworkManager
rm '/etc/systemd/system/multi-user.target.wants/NetworkManager.service'
rm '/etc/systemd/system/dbus-org.freedesktop.NetworkManager.service'
rm '/etc/systemd/system/dbus-org.freedesktop.nm-dispatcher.service'

# yum -y remove NetworkManager*

# /usr/bin/rm -rf /etc/NetworkManager

If you want to be more productive you should clean your system from FirewallD, install iptables-services and if you are going to install a redhat product/software disable SELinux as it’s manual going to suggest !

Now we can proceed.

# systemctl status network.service

will show us /etc/rc.d/init.d/network as the network orchestrator on the system.
Reading this file will get you a basic understanding of networking.

if [ ! -f /etc/sysconfig/network ]; then
    exit 6
fi

that tells us that file: /etc/sysconfig/network must exist on our system.

If you want to disable the network on this linux machine you can do it by adding the below declaration:

NETWORKING=no

So here are my notes for bonding:

eth0 + eth1 = bond0 with Adaptive transmit load balancing:

# cat /etc/sysconfig/network-scripts/ifcfg-em1
DEVICE=em1
MASTER=bond0
SLAVE=yes

# cat /etc/sysconfig/network-scripts/ifcfg-em2
DEVICE=em2
MASTER=bond0
SLAVE=yes

and bond0:

DEVICE=bond0

BONDING_OPTS="miimon=1 updelay=0 downdelay=0 mode=balance-tlb"
TYPE=Bond
BONDING_MASTER=yes

DNS1=xxx.xxx.xxx.xxx
GATEWAY=8.8.8.8
IPADDR=xxx.xxx.xxx.1
PREFIX=24
DEFROUTE=yes

BOOTPROTO=none
ONBOOT=yes

and as yoda would tell:

“else everything do not need you”