NetworkManager.conf

TLDR

Basic configuration

$ [main]\nplugins=ifupdown,keyfile

Set DNS mode

$ [main]\ndns=dnsmasq

Disable MAC randomization

$ [device]\nwifi.scan-rand-mac-address=no

Set hostname mode

$ [main]\nhostname-mode=dhcp

SYNOPSIS

/etc/NetworkManager/NetworkManager.conf

NetworkManager.conf is the main configuration file for NetworkManager. It controls DNS handling, plugins, device management, and various global settings.
Additional configuration can be placed in /etc/NetworkManager/conf.d/.

PARAMETERS

[main]

Main configuration section.

plugins

Connection plugins to use.

dns

DNS processing mode.

[connection]

Default connection settings.

[device]

Device-specific settings.

[logging]

Logging configuration.

EXAMPLE CONFIG

$ [main]
plugins=ifupdown,keyfile
dns=systemd-resolved

[ifupdown]
managed=false

[device]
wifi.scan-rand-mac-address=yes

[connection]
wifi.powersave=2

[logging]
level=WARN

DNS MODES

$ default      - Use resolv.conf
dnsmasq      - Local dnsmasq
systemd-resolved - Use resolved
none         - No DNS management

CAVEATS

Syntax errors may prevent NM from starting. Use conf.d/ for drop-in files. Restart NM after changes.