Working with Network on CentOS/RHEL 07 - Part 02

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Network Configuration Using a Text User Interface (nmtui)

- Installing Network Configuration  Text User Interface

[root@localhost ~]# yum install NetworkManager-tui

- Setting up connection name to an interface using nmtui, first we will check list of active devices.

[root@testvm07002 ~]# /etc/init.d/network status

Configured devices:

lo enp0s10 enp0s3 enp0s8 enp0s9

Currently active devices:

lo enp0s3 enp0s8 enp0s9 enp0s10

- To change parameters for a connection name

[root@localhost ~]# nmtui edit enp0s10

- Various Values specified in above screenshot can be modified as per the requirements, those are listed below,

·  Profile Name :- the Connection Name or Ethernet Name visible on OS

· Device :- MAC address of physical Interface/Ethernet Device

· IPV4 Configuration :- Automatic(DHCP), Manual, Shared, Disabled, Link-Local

· Addresses :- IP addresses to be assigned to the interface

· Gateway :- IP address of Gateway server, Not required in case of Proxy based implementations/setups

· DNS Servers :- IP address of DNS servers

· Routing :- Additional route to be added can be specified in this section

- Files those are modified for the hostname changes are as shown below,

[root@localhost ~]# cat /etc/sysconfig/network-scripts/ifcfg-enp0s10

HWADDR=08:00:27:94:3E:02

TYPE=Ethernet

BOOTPROTO=dhcp

DEFROUTE=yes

PEERDNS=yes

PEERROUTES=yes

IPV4_FAILURE_FATAL=no

IPV6INIT=yes

IPV6_AUTOCONF=yes

IPV6_DEFROUTE=yes

IPV6_PEERDNS=yes

IPV6_PEERROUTES=yes

IPV6_FAILURE_FATAL=no

NAME=enp0s10

UUID=4474b5b1-e576-45bd-babb-c3ce22d41166

ONBOOT=yes

- Setting up dhcp ip address to an interface using nmtui

[root@localhost ~]# nmtui

- Files those are modified for the connection profile changes are as shown below,

[root@localhost ~]# cat /etc/sysconfig/network-scripts/ifcfg-enp0s9

TYPE=Ethernet

BOOTPROTO=dhcp

DEFROUTE=yes

IPV4_FAILURE_FATAL=no

IPV6INIT=yes

IPV6_AUTOCONF=yes

IPV6_DEFROUTE=yes

IPV6_FAILURE_FATAL=no

NAME=enp0s9

UUID=bb53a5ca-2dc3-4ebe-ba35-ad3664475fa9

ONBOOT=yes

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

PEERDNS=yes

PEERROUTES=yes

IPV6_PEERDNS=yes

IPV6_PEERROUTES=yes

- Setting up static ip address to an interface using nmtui

[root@localhost ~]# nmtui

- Files those are modified for the connection profile changes are as shown below,

[root@localhost ~]# cat /etc/sysconfig/network-scripts/ifcfg-enp0s8

TYPE=Ethernet

BOOTPROTO=none

DEFROUTE=no

IPV4_FAILURE_FATAL=no

IPV6INIT=yes

IPV6_AUTOCONF=yes

IPV6_DEFROUTE=yes

IPV6_FAILURE_FATAL=no

NAME=enp0s8

UUID=b38fa076-ea97-44d2-a30c-05b3959a1775

ONBOOT=yes

HWADDR=08:00:27:74:9D:4B

IPADDR=192.168.248.202

PREFIX=32

GATEWAY=192.168.248.1

IPV6_PEERDNS=yes

IPV6_PEERROUTES=yes

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