Basics Of NetworkManager Command Line Tool, Nmcli
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![](http://1102047360.rsc.cdn77.org/wp-content/uploads/2015/08/networking1.jpg)

### Introduction ###

In this tutorial, we will discuss NetworkManager command line tool, aka **nmcli**, in CentOS / RHEL 7. Users who are using **ifconfig** should avoid this command in Centos 7.

Lets configure some networking settings with nmcli utility.

#### To get all address information of all interfaces connected with System ####

    [root@localhost ~]# ip addr show

**Sample Output:**

    1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN 
     link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
     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 1500 qdisc pfifo_fast state UP qlen 1000
     link/ether 00:0c:29:67:2f:4c brd ff:ff:ff:ff:ff:ff
     inet 192.168.1.51/24 brd 192.168.1.255 scope global eno16777736
     valid_lft forever preferred_lft forever
     inet6 fe80::20c:29ff:fe67:2f4c/64 scope link 
     valid_lft forever preferred_lft forever

#### To retrieve packets statistics related with connected interfaces ####

    [root@localhost ~]# ip -s link show eno16777736

**Sample Output:**

![unxmen_(011)](http://www.unixmen.com/wp-content/uploads/2015/08/unxmen_0111.png)

#### Get routing configuration ####

    [root@localhost ~]# ip route

Sample Output:

    default via 192.168.1.1 dev eno16777736 proto static metric 100 
    192.168.1.0/24 dev eno16777736 proto kernel scope link src 192.168.1.51 metric 100

#### Analyze path for some host/website ####

    [root@localhost ~]# tracepath unixmen.com

Output will be just like traceroute but in more managed form.

![unxmen_0121](http://www.unixmen.com/wp-content/uploads/2015/08/unxmen_01211.png)

### nmcli utility ###

**Nmcli** is a very rich and flexible command line utility. some of the terms used in nmcli are:

- **Device** – A network interface being used.
- **Connection** – A set of configuration settings, for a single device you can have multiple connections, you can switch between connections.

#### Find out how many connections are available for how many devices ####

    [root@localhost ~]# nmcli connection show

![unxmen_(013)](http://www.unixmen.com/wp-content/uploads/2015/08/unxmen_013.png)

#### Get details of a specific connection ####

    [root@localhost ~]# nmcli connection show eno1

**Sample output:**

![unxmen_(014)](http://www.unixmen.com/wp-content/uploads/2015/08/unxmen_0141.png)

#### Get the Network device status ####

    [root@localhost ~]# nmcli device status

----------

     DEVICE               TYPE              STATE          CONNECTION 
    eno16777736            ethernet      connected              eno1 
    lo                     loopback      unmanaged               --

#### Create a new connection with “dhcp” ####

    [root@localhost ~]# nmcli connection add con-name "dhcp" type ethernet ifname eno16777736

Where,

- **Connection add** – To add new connection
- **con-name** – connection name
- **type** – type of device
- **ifname** – interface name

This command will add connection with dhcp protocol.

**Sample output:**

    Connection 'dhcp' (163a6822-cd50-4d23-bb42-8b774aeab9cb) successfully added.

#### Instead of assigning an IP via dhcp, you can add ip address as “static” ####

    [root@localhost ~]# nmcli connection add con-name "static" ifname eno16777736 autoconnect no type ethernet ip4 192.168.1.240 gw4 192.168.1.1

**Sample Output:**

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

**Update connection:**

    [root@localhost ~]# nmcli connection up eno1

Again Check, whether ip address is changed or not.

    [root@localhost ~]# ip addr show

![unxmen_(015)](http://www.unixmen.com/wp-content/uploads/2015/08/unxmen_0151.png)

#### Add DNS settings to Static connections. ####

    [root@localhost ~]# nmcli connection modify "static" ipv4.dns 202.131.124.4

#### Add additional DNS value. ####

[root@localhost ~]# nmcli connection modify "static" +ipv4.dns 8.8.8.8

**Note**: For additional entries **+** symbol will be used and **+ipv4.dns** will be used instead on **ip4.dns**

Put an additional ip address:

    [root@localhost ~]# nmcli connection modify "static" +ipv4.addresses 192.168.200.1/24

Refresh settings using command:

    [root@localhost ~]# nmcli connection up eno1

![unxmen_(016)](http://www.unixmen.com/wp-content/uploads/2015/08/unxmen_016.png)

You will see, setting are effective now.

That’s it.

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via: http://www.unixmen.com/basics-networkmanager-command-line-tool-nmcli/

作者：Rajneesh Upadhyay
译者：[译者ID](https://github.com/译者ID)
校对：[校对者ID](https://github.com/校对者ID)

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