NMCLI Network Management command-line tool basics

Introduced

In this tutorial, we will discuss the network Management command-line tool in Centos/rhel 7, NetworkManager, also known as NMCLI. Users who use ifconfig should avoid using Ifconfig in CentOS 7.

Let's configure some network settings with the Nmcli tool.

To get address information for all interfaces in the system

[[Email protected] ~]# IP addrshow

Sample Output :

1:lo:<loopback,up,lower_up> MTU 65536 qdisc noqueue State UNKNOWN

Link/loopback 00:00:00:00:00:00 brd00:00:00:00:00:00

inet 127.0.0.1/8 Scope host Lo

Valid_lft Forever Preferred_lft Forever

INET6:: 1/128 Scope Host

Valid_lft Forever Preferred_lft Forever

2:eno16777736: <broadcast,multicast,up,lower_up>mtu qdisc pfifo_fast State up Qlen 1000

Link/ether 00:0c:29:67:2f:4c Brdff:ff:ff:ff:ff:ff

inet 192.168.1.51/24 BRD 192.168.1.255 scopeglobal eno16777736

Valid_lft Forever Preferred_lft Forever

Inet6 FE80::20C:29FF:FE67:2F4C/64 Scope link

Valid_lft Forever Preferred_lft Forever

Retrieving packet statistics related to a connected interface

[Email protected] ~]# Ip-slink show eno16777736

Get the routing configuration

[[Email protected] ~]# IP route

Sample Output :

Default via 192.168.1.1 deveno16777736 proto static metric 100

192.168.1.0/24 deveno16777736 proto kernel scope link src 192.168.1.51 metric 100

Analyze Host/site path

[Email protected] ~]# tracepathunixmen.com

The output is like traceroute, but more complete.

nmcli Tools

nmcli is a very rich and flexible command-line tool. Nmcli are used in the following situations:

Device – The network interface being used

Connect – A set of configuration settings that can have multiple connections for a single device and can be switched between connections.

Find out how many devices are connected to the service

[Email protected] ~]# nmcliconnection Show

Get details of a specific connection

[Email protected] ~]# nmcliconnection show Eno1

Get Network Device status

[Email protected] ~]# nmclidevice status

DEVICE TYPE State CONNECTION

eno16777736 Ethernet Connected Eno1

Lo Loopback unmanaged--

To create a new connection by using DHCP

[[email protected] ~]# nmcliconnection add con-name "DHCP" type Ethernet ifname eno16777736

Over here

Connection Add – Add a new connection

Con-name – Connection Name

type – Device Type

ifname – Interface Name

This command adds a connection using the DHCP protocol

Sample Output :

Connection ' DHCP ' (163A6822-CD50-4D23-BB42-8B774AEAB9CB) successfully added.

Do not assign IP via DHCP, add address using "static"

[Email protected] ~]# nmcliconnection add con-name "static" ifname eno16777736 AutoConnect notype Ethernet IP4 192.168.1. Gw4 192.168.1.1

Sample Output :

Connection ' static ' (8e69d847-03d7-47c7-8623-bb112f5cc842) successfully added.

Update Connection :

[Email protected] ~]# nmcliconnection up Eno1

Check again to see if the IP address has changed

[[Email protected] ~]# IP addrshow

Adding DNS settings to a static connection

[Email protected] ~]# nmcliconnection Modify "static" Ipv4.dns 202.131.124.4

Add more DNS

[Email protected] ~]# nmcliconnection Modify "static" +ipv4.dns 8.8.8.8

Note : To use the extra + symbol, and if +ipv4.dns, not ip4.dns.

Add an additional IP address

[Email protected] ~]# nmcliconnection Modify "static" +ipv4.addresses 192.168.200.1/24

To refresh the settings using the command:

[Email protected] ~]# nmcliconnection up Eno1

You will see that the settings are in effect.

End.

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NMCLI Network Management command-line tool basics