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====== NetworkManager command line ======

GUI: nmtui

===== NetworkManager service =====

First step, check if NetworkManager service is enable, and network service (old service) disable:
<cli prompt='#'>
[root@centos7 ~]# systemctl list-unit-files | grep -i network
dbus-org.freedesktop.NetworkManager.service enabled
NetworkManager-dispatcher.service           enabled
NetworkManager-wait-online.service          disabled
NetworkManager.service                      enabled
network-online.target                       static
network.target                              static
[root@centos7 ~]# systemctl list-units | grep -i network
NetworkManager.service                                         loaded active running   Network Manager
rhel-import-state.service                                      loaded active exited    Import network configuration from initramfs network.target                    loaded active active    Network
[root@centos7 ~]# chkconfig --list network
network         0:off   1:off  2:off 3:off 4:off 5:off  6:off
</cli>

Else change it:
<cli prompt='#'>
[root@centos7 ~]# chkconfig network stop
[root@centos7 ~]# chkconfig network off

[root@centos7 ~]# systemctl enable NetworkManager
[root@centos7 ~]# systemctl start NetworkManager
</cli>

Common initial setup
<cli prompt='#'>
[root@centos7 ~]# nmcli con mod eth0 ipv4.addresses 10.10.10.119/24 ipv4.gateway 10.10.10.1 
[root@centos7 ~]# nmcli con mod eth0 connection.autoconnect yes
[root@centos7 ~]# nmcli con mod eth0 ipv4.dns 10.10.10.2,10.10.10.3 ipv4.dns-search  "mydomain.lu"
[root@centos7 ~]# nmcli con mod eth0 ipv4.method manual 
[root@centos7 ~]# nmcli con up eth0 ifname eth0
</cli>
Check the Network Manager status
<cli prompt='#'>
[root@centos7 ~]# systemctl status NetworkManager
NetworkManager.service - Network Manager
   Loaded: loaded (/usr/lib/systemd/system/NetworkManager.service; enabled)
   Active: active (running) since Fri 2014-10-31 13:49:20 CET; 35min ago
 Main PID: 1886 (NetworkManager)
   CGroup: /system.slice/NetworkManager.service
           Ã¢886 /usr/sbin/NetworkManager --no-daemon

Oct 31 13:49:20 centos7 NetworkManager[1886]: <info> Activation (eno16780032) Stage 3 of 5 (IP Configure Start) complete.
Oct 31 13:49:20 centos7 NetworkManager[1886]: <info> Activation (eno16780032) Stage 5 of 5 (IPv4 Commit) started...
Oct 31 13:49:20 centos7 NetworkManager[1886]: <info> (eno16780032): device state change: ip-config -> ip-check (reason 'none') [70 80 0]
Oct 31 13:49:20 centos7 NetworkManager[1886]: <info> Activation (eno16780032) Stage 5 of 5 (IPv4 Commit) complete.
Oct 31 13:49:20 centos7 NetworkManager[1886]: <info> (eno16780032): device state change: ip-check -> secondaries (reason 'none') [80 90 0]
Oct 31 13:49:20 centos7 NetworkManager[1886]: <info> (eno16780032): device state change: secondaries -> activated (reason 'none') [90 100 0]
Oct 31 13:49:20 centos7 NetworkManager[1886]: <info> NetworkManager state is now CONNECTED_LOCAL
Oct 31 13:49:20 centos7 NetworkManager[1886]: <info> Policy set 'eth0' (eno16780032) as default for IPv4 routing and DNS.
Oct 31 13:49:20 centos7 NetworkManager[1886]: <info> Activation (eno16780032) successful, device activated.
Oct 31 13:49:26 centos7 NetworkManager[1886]: <info> startup complete
</cli>

**Be careful, in order to apply a change in the network config using NetworManager, do a reload-or-restart, else the change won't be active !!!**

<cli prompt='#'>
[root@centos7 ~]# systemctl reload-or-restart NetworkManager
</cli>

===== NetworkManager command line =====

Help nmcli:
<cli prompt='$'> 
$ nmcli help
Usage: nmcli [OPTIONS] OBJECT { COMMAND | help }

OPTIONS
  -t[erse]                                   terse output
  -p[retty]                                  pretty output
  -m[ode] tabular|multiline                  output mode
  -f[ields] <field1,field2,...>|all|common   specify fields to output
  -e[scape] yes|no                           escape columns separators in values
  -n[ocheck]                                 don't check nmcli and NetworkManager versions
  -a[sk]                                     ask for missing parameters
  -w[ait] <seconds>                          set timeout waiting for finishing operations
  -v[ersion]                                 show program version
  -h[elp]                                    print this help

OBJECT
  g[eneral]       NetworkManager's general status and operations
  n[etworking]    overall networking control
  r[adio]         NetworkManager radio switches
  c[onnection]    NetworkManager's connections
  d[evice]        devices managed by NetworkManager
</cli>

==== Static IP configuration ====

Review the status of the devices and connections
<cli prompt='$'>
$ nmcli device status
DEVICE  TYPE      STATE      CONNECTION 
ens3    ethernet  connected  my-office  
ens9    ethernet  connected  Myeth0   
lo      loopback  unmanaged  --
</cli>

To list the currently available network connections
<cli prompt='$'>
$ nmcli con show
NAME              UUID                                  TYPE            DEVICE
Auto Ethernet     9b7f2511-5432-40ae-b091-af2457dfd988  802-3-ethernet  --
ens3              fb157a65-ad32-47ed-858c-102a48e064a2  802-3-ethernet  Myeth1
MyWiFi            91451385-4eb8-4080-8b82-720aab8328dd  802-11-wireless wlan0
</cli>

Rename connection name:
<cli prompt='$'>
$ nmcli con mod "Auto Ethernet" connection.id ethernet1
$ nmcli con show
NAME              UUID                                  TYPE            DEVICE
ethernet1         9b7f2511-5432-40ae-b091-af2457dfd988  802-3-ethernet  --
...
</cli>

Adding a Static Ethernet Connection
  nmcli connection add type ethernet con-name connection-name ifname interface-name ip4 address gw4 address
<cli prompt='$'> 
$ nmcli con add type ethernet con-name Myeth0 ifname ens9 autoconnect yes save yes ip4 10.10.10.10/24 gw4 10.10.10.254
$ nmcli con add type ethernet con-name Myeth0 ifname ens9 autoconnect yes save yes ip4 10.10.10.10/24 gw4 10.10.10.254 ip6 abbe::cafe gw6 2001:db8::1
</cli>
A file /etc/sysconfig/network-scripts/ifcfg-Myeth0 has been created

Change the IP address on eth0:
<cli prompt='#'>
[root@fedora22 ~]# nmcli con mod eth0 ipv4.method manual ipv4.addr "10.0.102.22/24"
[root@fedora22 ~]# nmcli device disconnect eth0
[root@fedora22 ~]# nmcli device connect eth0
[root@fedora22 ~]# ip a
...
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UNKNOWN group default qlen 1000
    link/ether fa:fc:a2:7c:71:04 brd ff:ff:ff:ff:ff:ff
    inet 10.0.102.22/24 brd 10.0.102.255 scope global eth0
</cli>


Add 2 IPV4 DNS
<cli prompt='$'> 
$ nmcli con mod Myeth0 ipv4.dns "8.8.8.8 8.8.4.4" ipv4.dns-search "mydomain.org"
</cli>

To bring up the new Ethernet connection
<cli prompt='$'> 
$ nmcli con up Myeth0 ifname ens9
</cli>

To view detailed information about the newly configured connection
<cli prompt='$'> 
$ nmcli -p con show Myeth0
===============================================================================
                       Connection profile details (eth0)
===============================================================================
connection.id:                          Myeth0
connection.uuid:                        ccccd47e-b214-4440-9161-addfbbff1009
connection.interface-name:              eno16780032
connection.type:                        802-3-ethernet
connection.autoconnect:                 yes
connection.timestamp:                   1414764561
connection.read-only:                   no
connection.permissions:
connection.zone:                        --
connection.master:                      --
connection.slave-type:                  --
connection.secondaries:
connection.gateway-ping-timeout:        0
-------------------------------------------------------------------------------
802-3-ethernet.port:                    --
802-3-ethernet.speed:                   0
802-3-ethernet.duplex:                  --
802-3-ethernet.auto-negotiate:          yes
802-3-ethernet.mac-address:             --
802-3-ethernet.cloned-mac-address:      --
802-3-ethernet.mac-address-blacklist:
802-3-ethernet.mtu:                     auto
802-3-ethernet.s390-subchannels:
802-3-ethernet.s390-nettype:            --
802-3-ethernet.s390-options:
-------------------------------------------------------------------------------
ipv4.method:                            manual
ipv4.dns:                               192.168.20.1, 192.168.20.2, 192.168.20.3
ipv4.dns-search:                        mydomain.org
ipv4.addresses:                         { ip = 192.168.11.194/24, gw = 192.168.11.250 }
ipv4.routes:
ipv4.ignore-auto-routes:                no
ipv4.ignore-auto-dns:                   no
ipv4.dhcp-client-id:                    --
ipv4.dhcp-send-hostname:                yes
ipv4.dhcp-hostname:                     --
ipv4.never-default:                     no
ipv4.may-fail:                          yes
-------------------------------------------------------------------------------
ipv6.method:                            ignore
ipv6.dns:
ipv6.dns-search:
ipv6.addresses:
ipv6.routes:
ipv6.ignore-auto-routes:                no
ipv6.ignore-auto-dns:                   no
ipv6.never-default:                     no
ipv6.may-fail:                          yes
ipv6.ip6-privacy:                       -1 (unknown)
ipv6.dhcp-hostname:                     --
-------------------------------------------------------------------------------
===============================================================================
      Activate connection details (ccccd47e-b214-4440-9161-addfbbff1009)
===============================================================================
GENERAL.NAME:                           eth0
GENERAL.UUID:                           ccccd47e-b214-4440-9161-addfbbff1009
GENERAL.DEVICES:                        eno16780032
GENERAL.STATE:                          activated
GENERAL.DEFAULT:                        yes
GENERAL.DEFAULT6:                       no
GENERAL.VPN:                            no
GENERAL.ZONE:                           --
GENERAL.DBUS-PATH:                      /org/freedesktop/NetworkManager/ActiveConnection/0
GENERAL.CON-PATH:                       /org/freedesktop/NetworkManager/Settings/0
GENERAL.SPEC-OBJECT:                    --
GENERAL.MASTER-PATH:                    --
-------------------------------------------------------------------------------
IP4.ADDRESS[1]:                         ip = 192.168.11.194/24, gw = 192.168.11.250
IP4.DNS[1]:                             192.168.20.1
IP4.DNS[2]:                             192.168.20.2
IP4.DNS[3]:                             192.168.20.3
-------------------------------------------------------------------------------
-------------------------------------------------------------------------------
</cli>

To get details about all the devices
<cli prompt='$'> 
$ nmcli d show 
GENERAL.DEVICE:                         eno16780032
GENERAL.TYPE:                           ethernet
GENERAL.HWADDR:                         00:50:56:83:22:1E
GENERAL.MTU:                            1500
GENERAL.STATE:                          100 (connected)
GENERAL.CONNECTION:                     eth0
GENERAL.CON-PATH:                       /org/freedesktop/NetworkManager/ActiveConnection/0
WIRED-PROPERTIES.CARRIER:               on
IP4.ADDRESS[1]:                         ip = 192.168.11.194/24, gw = 192.168.11.250
IP4.DNS[1]:                             192.168.20.1
IP4.DNS[2]:                             192.168.20.2
IP4.DNS[3]:                             192.168.20.3

GENERAL.DEVICE:                         lo
GENERAL.TYPE:                           loopback
GENERAL.HWADDR:                         00:00:00:00:00:00
GENERAL.MTU:                            65536
GENERAL.STATE:                          10 (unmanaged)
GENERAL.CONNECTION:                     --
GENERAL.CON-PATH:                       --
</cli>

==== Delete a network connection from NetworkManager ====

**nmcli con del <UUID>**

<cli prompt='#'>
[root@rh73 ~]# nmcli con show
NAME              UUID                                  TYPE            DEVICE
team0             e519a6d9-4bf6-438e-a193-d3d3c799c388  team            team0
enP7p128s0f1      c0e9b8ed-2c91-49c7-9991-34d7fabc1556  802-3-ethernet  --
enP7p128s0f3      a38fe38d-32b5-4148-b5e7-a881179517d1  802-3-ethernet  --
enP7p128s0f0      848defb7-6922-40b9-a70c-a7458a991453  802-3-ethernet  enP7p128s0f0
enP2p96s0f2       d267c5e8-3c5f-4c56-970c-74d823a74fe1  802-3-ethernet  --
enP7p128s0f2      197de45a-0b6d-48f8-9a77-39fce3d932d8  802-3-ethernet  --
enP2p96s0f0       9b50ac73-6b82-0a4a-0c2b-45f213d99656  802-3-ethernet  --
enP2p96s0f1       d3c3d721-ce8d-45c2-aa8a-6cb434a7b59f  802-3-ethernet  --
enP2p96s0f3       f2792d73-6ec1-4688-8a52-ad0d1c89903c  802-3-ethernet  --
team0-enP4p1s0f1  0b53b68e-e89e-4fad-96c1-0023f414b4e5  802-3-ethernet  enP4p1s0f1
team0-enP4p1s0f0  eec115e5-ba9c-4a35-a05b-d39699a6363b  802-3-ethernet  enP4p1s0f0
[root@rh73 ~]# nmcli con del e519a6d9-4bf6-438e-a193-d3d3c799c388
</cli>

==== Changing hostname ====

Show the current hostname:
<cli prompt='$'>
$ nmcli general hostname
localhost.localdomain
</cli>

To change the hostname:
<cli prompt='$'>
$ nmcli general hostname RedHat
</cli>

==== Adding a Wi-Fi Connection ====

To view the available Wi-Fi access points
<cli prompt='$'> 
$ nmcli dev wifi list
  SSID            MODE  CHAN  RATE     SIGNAL  BARS  SECURITY
  FedoraTest     Infra  11    54 MB/s  98      ▂▄▆█  WPA1
  Red Hat Guest  Infra  6     54 MB/s  97      ▂▄▆█  WPA2       
  Red Hat        Infra  6     54 MB/s  77      ▂▄▆_  WPA2 802.1X
* Red Hat        Infra  40    54 MB/s  66      ▂▄▆_  WPA2 802.1X
  VoIP           Infra  1     54 MB/s  32      ▂▄__  WEP
  MyCafe         Infra  11    54 MB/s  39      ▂▄__  WPA2
</cli>

To create a Wi-Fi connection profile with static IP configuration, but allowing automatic DNS address assignment
<cli prompt='$'> 
$ nmcli con add con-name MyCafe ifname wlan0 type wifi ssid MyCafe ip4 192.168.100.101/24 gw4 192.168.100.1
</cli>

To set a WPA2 password, for example “caffeine”
<cli prompt='$'> 
$ nmcli con modify MyCafe wifi-sec.key-mgmt wpa-psk
$ nmcli con modify MyCafe wifi-sec.psk caffeine
</cli>

To get the list of available wifi access points, type:
<cli prompt='#'> 
# nmcli d wifi
* SSID MODE CHAN RATE SIGNAL BARS SECURITY
AAA Infra 11 54 MB/s 55 ▂▄__ WPA2 802.1X
BBB Infra 11 54 MB/s 54 ▂▄__ WPA1
CCC Infra 1 54 MB/s 49 ▂▄__ WPA1
DDD Infra 11 54 MB/s 44 ▂▄__ WPA1 802.1X
EEE Infra 11 54 MB/s 92 ▂▄▆█ WEP
</cli>

To connect to a wifi access point specified by a SSID (here EEE), type:
<cli prompt='#'>
# nmcli d wifi connect EEE password '12345678901234567890123456'
</cli>

To request that NetworkManager rescans for available access points, type:
<cli prompt='#'>
# nmcli d wifi rescan
</cli>

===== Problem with network adapter =====

Check network adapter location
<cli prompt='#'>
# lshw -class network -short
H/W path          Device      Class       Description
=====================================================
/0/100/3          enp0s3      network     82540EM Gigabit Ethernet Controller
/0/100/8                      network     79c970 [PCnet32 LANCE]
# lspci -nn | grep Eth
00:03.0 Ethernet controller [0200]: Intel Corporation 82540EM Gigabit Ethernet Controller [8086:100e] (rev 02)
00:08.0 Ethernet controller [0200]: Advanced Micro Devices, Inc. [AMD] 79c970 [PCnet32 LANCE] [1022:2000] (rev 40)
# nmcli -f general.device,general.udi dev sh
GENERAL.DEVICE:                         enp0s3
GENERAL.UDI:                            /sys/devices/pci0000:00/0000:00:03.0/net/enp0s3

GENERAL.DEVICE:                         lo
GENERAL.UDI:                            /sys/devices/virtual/net/lo
</cli>

Here I got problem with network driver, which is no more supported. You can check in /var/log/messages

==== Rename network device ====

Change from **ens192** to **eth0**
<cli prompt='#'>
[root@ibmpvc01 ~]# lshw -class network -short
H/W path             Device      Class          Description
===========================================================
/0/100/16/0          ens192      network        VMXNET3 Ethernet Controller
</cli>

Add the option **net.ifnames=0** into file **/etc/default/grub**, and rebuild grub, then reboot
<cli prompt='#'>
[root@ibmpvc01 ~]# cat /etc/default/grub
...
GRUB_CMDLINE_LINUX="crashkernel=auto resume=/dev/mapper/rhel-swap rd.lvm.lv=rhel/root rd.lvm.lv=rhel/swap rd.lvm.lv=rhel/usr net.ifnames=0 rhgb quiet"

[root@ibmpvc01 ~]# grub2-mkconfig -o /boot/grub2/grub.cfg
[root@ibmpvc01 ~]# init 6
</cli>

After reboot
<cli prompt='#'>
[root@ibmpvc01 ~]# lshw -class network -short
H/W path             Device      Class          Description
===========================================================
/0/100/16/0          eth0        network        VMXNET3 Ethernet Controller
</cli>
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