NetworkManager

External

• https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html/Networking_Guide/sec-Introduction_to_NetworkManager.html

Internal

• systemd-hostnamed
• Linux 7 Configuring Network Manager

Overview

NetworkManager is the default networking service in RHEL 7. It represents a dynamic network control and configuration daemon that attempts to keep network devices and connections up and active when they are available.

NetworkManager can configure network aliases, IP addresses, static routes, DNS information and VPN connections. NetworkManager also provides an API via D-Bus which allows applications to query and control network configuration and state.

Theoretically, NetworkManager should coexist with ifcfg scripts.

NetworkManager may overwrite the content of the following:

• /etc/resolv.conf

In a systemd driven system, NetworkManager pulls the network.target.

Relationship between Network Manager and Network Scripts

https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html/Networking_Guide/sec-NetworkManager_and_the_Network_Scripts.html

Also see

Linux systemd and Network Status

Alternative

systemd-networkd