linux:networkmanager
Table of Contents
NetworkManager command line
GUI: nmtui
NetworkManager service
First step, check if NetworkManager service is enable, and network service (old service) disable:
[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
Else change it:
[root@centos7 ~]# chkconfig network stop [root@centos7 ~]# chkconfig network off [root@centos7 ~]# systemctl enable NetworkManager [root@centos7 ~]# systemctl start NetworkManager
Common initial setup
[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
Check the Network Manager status
[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 â886 /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
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 !!!
[root@centos7 ~]# systemctl reload-or-restart NetworkManager
NetworkManager command line
Help nmcli:
$ 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
Static IP configuration
Review the status of the devices and connections
$ nmcli device status DEVICE TYPE STATE CONNECTION ens3 ethernet connected my-office ens9 ethernet connected Myeth0 lo loopback unmanaged --
To list the currently available network connections
$ 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
Rename connection name:
$ nmcli con mod "Auto Ethernet" connection.id ethernet1 $ nmcli con show NAME UUID TYPE DEVICE ethernet1 9b7f2511-5432-40ae-b091-af2457dfd988 802-3-ethernet -- ...
Adding a Static Ethernet Connection
nmcli connection add type ethernet con-name connection-name ifname interface-name ip4 address gw4 address
$ 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
A file /etc/sysconfig/network-scripts/ifcfg-Myeth0 has been created
Change the IP address on eth0:
[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
Add 2 IPV4 DNS
$ nmcli con mod Myeth0 ipv4.dns "8.8.8.8 8.8.4.4" ipv4.dns-search "mydomain.org"
To bring up the new Ethernet connection
$ nmcli con up Myeth0 ifname ens9
To view detailed information about the newly configured connection
$ 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 ------------------------------------------------------------------------------- -------------------------------------------------------------------------------
To get details about all the devices
$ 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: --
Delete a network connection from NetworkManager
nmcli con del <UUID>
[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
Changing hostname
Show the current hostname:
$ nmcli general hostname localhost.localdomain
To change the hostname:
$ nmcli general hostname RedHat
Adding a Wi-Fi Connection
To view the available Wi-Fi access points
$ 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
To create a Wi-Fi connection profile with static IP configuration, but allowing automatic DNS address assignment
$ nmcli con add con-name MyCafe ifname wlan0 type wifi ssid MyCafe ip4 192.168.100.101/24 gw4 192.168.100.1
To set a WPA2 password, for example “caffeine”
$ nmcli con modify MyCafe wifi-sec.key-mgmt wpa-psk $ nmcli con modify MyCafe wifi-sec.psk caffeine
To get the list of available wifi access points, type:
# 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
To connect to a wifi access point specified by a SSID (here EEE), type:
# nmcli d wifi connect EEE password '12345678901234567890123456'
To request that NetworkManager rescans for available access points, type:
# nmcli d wifi rescan
Problem with network adapter
Check network adapter location
# 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
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
[root@ibmpvc01 ~]# lshw -class network -short H/W path Device Class Description =========================================================== /0/100/16/0 ens192 network VMXNET3 Ethernet Controller
Add the option net.ifnames=0 into file /etc/default/grub, and rebuild grub, then reboot
[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
After reboot
[root@ibmpvc01 ~]# lshw -class network -short H/W path Device Class Description =========================================================== /0/100/16/0 eth0 network VMXNET3 Ethernet Controller
linux/networkmanager.txt · Last modified: 2021/09/23 12:02 by manu
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