how to assign network setting in rhel 7 using nmtui and nmcli ?

How to assign network in RHEL 7?

networking two ways

lagacy
network manager

networkmanager
--------------

rpm -qa | grep -i Networkmanager

systemctl status NetworkManager

There are  three  different ways assign network settings

GUI ----->Graphical
text ... nmtui   --->Text based
cli .... nmcli    ----> Command line

Using lagacy network service
----------------------

planing to add manually values for eth0

vim /etc/sysconfig/netwok-scripts/ifcfg-eth0

DEVICE=eth0
ONBOOT=yes
BOOTPROTO=dhcp

for static

DEVICE=eth0
ONBOOT=yes
BOOTPROTO=none   or static
IPADDR=172.25.X.11
PREFIX=24  or  NETMASK=255.255.255.0
GATEWAY=172.25.X.254
DNS1=172.25.254.254

:wq

sytemctl restart NetworkManager

To assign  system name (hostname)

Using command line

hostnamectl set-hostname serverx.example.com

or

vim /etc/hostname
serverx.example.com

before rhel7 .....to set hostname

vim /etc/sysconfig/network
HOSTNAME=serverx.example.com


updating name server info

vim /etc/resolv.conf
nameserver 8.8.8.8

or local dns 172.25.254.254


local name mapping
------------------
if u have to systems .... call with nicknames ...alias name user /etc/hosts
give ip call that system with name  ( nss switch will manage this proccess)
ex:-  172.25.x.11 system1
     172.25.x.10 system2

vim /etc/hosts

172.25.x.11 system1
172.25.x.10 system2
:wq

using nmtui

nmtui stands for Network Manager Text User Interface.

nmtui is actually a very easy text based tool to configure IP address and host names. Just type “nmtui” on command prompt and follow the simple steps

Now choose your connection type after selecting “Edit a connection”. I am choosing ethernet as I don’t have any other connection to my virtual machine.

As I showing here in rhel7 configuring IP addresses. So I had selected “edit” to manually set the ip address

Now after selecting “manual” you can configure ip addresses as per your specifications.

After you press “OK” to come out of this window. Don’t forget to activate the network connection again.

Once you are done with the nmtui tool in rhel7 configuring IP addresses.  You can check using ‘ifconfig or ip a or hostname –i.

Using  nmcli (Network Manager Command Line Interface )

show the connections using

nmcli connection show

nmcli connection show eno1

Configure an IP address

nmcli connection modify eno1 ipv4.addresses 192.168.0.5/24

Configure an IP address with default gateway

nmcli connection modify eno1 ipv4.addresses 192.168.0.5/24 \  ipv4.gateway 192.168.0.1 ipv4.never-default no

Configure an additional IP address

nmcli connection modify eno1 +ipv4.addresses 192.168.0.6

Add a static route

These will be saved in the route-<interface> file in /etc/sysconfig/network-scripts/ :

nmcli connection modify eno1 +ipv4.routes '192.168.111.0/24 192.168.99.1'