'nmcli' Notes

Show which devices are managed by the system and which are not:

$ nmcli device status
DEVICE           TYPE      STATE                   CONNECTION      
br-0fcfa25a8aa9  bridge    connected (externally)  br-0fcfa25a8aa9 
br-578f5829c361  bridge    connected (externally)  br-578f5829c361 
docker0          bridge    connected (externally)  docker0         
br-587a54e4fa19  bridge    connected (externally)  br-587a54e4fa19 
br-757a277e9235  bridge    connected (externally)  br-757a277e9235 
br-aeeb4ae82611  bridge    connected (externally)  br-aeeb4ae82611 
eth0             ethernet  unmanaged               --              
veth4f7b25d      ethernet  unmanaged               --              
veth6703ac3      ethernet  unmanaged               --              
veth9243b6b      ethernet  unmanaged               --              
lo               loopback  unmanaged               --

# Also
$ nmcli -g all

 

Get the non-default configuration of an interface:

$ nmcli device show
$ nmcli device show eth0
GENERAL.DEVICE:                         eth0
GENERAL.TYPE:                           ethernet
GENERAL.HWADDR:                         00:1E:06:AA:BB:CC
GENERAL.MTU:                            1500
GENERAL.STATE:                          10 (unmanaged)
GENERAL.CONNECTION:                     --
GENERAL.CON-PATH:                       --
WIRED-PROPERTIES.CARRIER:               on
IP4.ADDRESS[1]:                         192.168.0.5/24
IP4.GATEWAY:                            192.168.0.254
IP4.ROUTE[1]:                           dst = 192.168.0.0/24, nh = 0.0.0.0, mt = 0
IP4.ROUTE[2]:                           dst = 0.0.0.0/0, nh = 192.168.0.254, mt = 0
IP6.ADDRESS[1]:                         2003:::5/64
IP6.ADDRESS[2]:                         fd::5/64
IP6.ADDRESS[3]:                         fe80::5/64
IP6.GATEWAY:                            fe80::31d6
IP6.ROUTE[1]:                           dst = ff00::/8, nh = ::, mt = 256, table=255
IP6.ROUTE[2]:                           dst = fe80::/64, nh = ::, mt = 256
IP6.ROUTE[3]:                           dst = fd::/64, nh = ::, mt = 256
IP6.ROUTE[4]:                           dst = ::/0, nh = fe80::31d6, mt = 100
IP6.ROUTE[5]:                           dst = 2003::/64, nh = ::, mt = 100

 

Show connection UUIDs

$ nmcli  con
NAME                UUID                                  TYPE      DEVICE  
Wired connection 1  1d241a7a-6dcb-11ef-9e05-dfcdde7a2112  ethernet  eth0    
docker0             1d66dbf8-6dcb-11ef-97c2-b364a83594c6  bridge    docker0

 

Show connection full configuration:

$ nmcli connection show 1d241a7a-6dcb-11ef-9e05-dfcdde7a2112

 

Change a setting:

# Disable IPv6 privacy extensions
sudo nmcli connection modify 1d241a7a-6dcb-11ef-9e05-dfcdde7a2112 ipv6.addr-gen-mode eui64

# Enable IPv6 privacy extensions
sudo nmcli connection modify 1d241a7a-6dcb-11ef-9e05-dfcdde7a2112 ipv6.addr-gen-mode stable-privacy

# Add "+" or remove "-" and IP address
sudo nmcli connection modify 1d241a7a-6dcb-11ef-9e05-dfcdde7a2112 +ipv6.addresses "aaaa::bbbb/64"

 

Apply changes:

sudo nmcli d connect eth0

 

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