Systemd - networkd is a management network service program, can be used to manage Ethernet, WIFI, Bridges, EC20 network modules such as priority, and connection, cooperate systemd - resolved services are used together, the main purpose is to study the Ethernet, WIFI, EC20 module management at the same time, and in the specified priority to send and receive data,
2. Hardware resources
MYD YA157C - V2 development board
WIFI antenna
USB adapter plate
EC20 module
Cable
The router
3. Software resources
The Linux kernel 5.4.31
Systemd - networkd
Systemd - resolved
4. Environment for
Will be MYD YA157C - V2 burn-in mirror, connect the wifi, wifi antenna EC20 module connected to the USB port access lines, the router configuration wi-fi hotspots, and connect the network,
5. Steps
5.1. Check the environment
1) check the running status systemd - networkd
2) check the running status systemd - resolved
Active: the Active (running) running
3) check the DNS configuration file
Resolv.conf is resolv - the conf. Systemd soft connection
/sbin/resolvconf is/usr/bin/resolvectl soft connection
4) check the network management information
Lo local loopback no management on systemd
Eth0 Ethernet has on systemd management
Ppp0 EC20 module not on systemd management
Wlan0 wifi no management on systemd
5.2 check xx-xxx.net work
Systemd - networkd equipment of writing for xx-xxxx.net work, must end with a network, the former traversal can be carried in dictionary order, equipment configuration files can be placed a few directory:/etc/Systemd/network/,
/run/systemd/network/,
/lib/systemd/network/.
Priority for the/etc/& gt;/run/& gt;/lib/,
In 5.1 have know Ethernet managed, here directly from its configuration files,
The new file/lib/systemd/network/50-wired.net work
Name=scheme under the eth all * eth opening device adapter
HDCP=ipv4 automatically obtain IP
RouteMetric 15 jump jump points points IP route can see the following information:
15 routing Metric jump points 15
Note: jump points can reflect the number of hops, the speed of path, path reliability, path throughput and management properties, the smaller the value of the Metric, the higher the priority,
With the content length is too long, the field development points three foreign release notes: development notes | Systemd STM32MP1 a variety of network communication management (on) development notes | Systemd realize STM32MP1 (middle) for the management of network communication development notes | Systemd STM32MP1 a variety of network communication management (bottom)
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