Working with Network on CentOS/RHEL 07 - Part 09

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Configure Static IP address using Command Line UI (nmtui)

- In this section of document we will have a look on how we can configure an IP address (IPV4) on an Ethernet interface in RHEL/CENTOS 7

- First execute below command to get into command line UI provided by OS

[root@myserver2 ~]# nmtui

- Post execution of command “nmtui” on putty itself you will be given an user interface which will help you step wise for the configuration of network interface details.

- Select the desired physical connection profile to which IP address details are to be modified.

- Assign required details to the interface such as MAC address, MTU to be supported, IP address , Gateway IP Address, DNS Server’s IP address, Domain name of which interface should belong, Parameter to get Interface Automatically UP

- Once all changes are saved IP address details can be seen in the below command and file outputs,

[root@myserver2 ~]# ip addr show enp0s9

4: enp0s9: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000

    link/ether 08:00:27:b6:50:f3 brd ff:ff:ff:ff:ff:ff

    inet 192.168.248.202/24 brd 192.168.248.255 scope global dynamic enp0s9 valid_lft 813sec preferred_lft 813sec

    inet6 fe80::a00:27ff:feb6:50f3/64 scope link valid_lft forever preferred_lft forever

[root@myserver2 ~]# cat /etc/sysconfig/network-scripts/ifcfg-wired-connection-enp0s9

TYPE=Ethernet

BOOTPROTO=dhcp

DEFROUTE=yes

IPV4_FAILURE_FATAL=no

IPV6INIT=yes

IPV6_AUTOCONF=yes

IPV6_DEFROUTE=yes

IPV6_FAILURE_FATAL=yes

NAME=wired-connection-enp0s9

UUID=fc5cd587-6e1d-4266-a1da-aad57036a1f6

ONBOOT=yes

DNS1=192.168.248.1

HWADDR=08:00:27:B6:50:F3

MACADDR=08:00:27:B6:50:F3

MTU=1500

IPADDR=192.168.248.202

PREFIX=32

GATEWAY=192.168.248.1

PEERDNS=yes

PEERROUTES=yes

IPV6_PEERDNS=yes

IPV6_PEERROUTES=yes

Note:- IPV6 related can be removed from the file if needed manually, presence of it will not be of that much problem of confusion

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