1. Purpose[edit | edit source]
This article describes how to configure the Ethernet interface.
This article provides two ways to make it:
- via ifconfig: to put quickly and temporary the Ethernet interface with static IP address.
- via systemd: to change durably the Ethernet configuration with static IP address
2. Using Ifconfig tools[edit | edit source]
- Connect an Ethernet cable and enjoy
At startup SSH daemon (sshd) and ifplugd daemon are automatically launched:
- sshd (useful to perform ssh, scp)
- ifplugd detect:
- udhcpc is launched on cable detection to retrieve an IP address,
If a DHCP server is not available, one can set the Ethernet IP adress with :
Board $> ifconfig eth0 uuu.xxx.yyy.zzz
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If there is some service such as systemd-networkd, NetworkManager, Connman , the configuration of Ethernet interface can change when the service see the change |
- To check if eth0 and the gateway are well configured, one can type:
Board $>ifconfig Board $>route
- In the console, a log similar to the one below should be displayed:
Board $> ifconfig
eth0 Link encap:Ethernet HWaddr 00:80:E1:01:39:61
inet addr:10.48.1.172 Bcast:10.48.3.255 Mask:255.255.252.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:18 errors:0 dropped:0 overruns:0 frame:0
TX packets:2 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:3038 (2.9 KiB) TX bytes:684 (684.0 B)
Interrupt:103
STM32MP1 # route
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
default lme-gw-vl802.lm 0.0.0.0 UG 10 0 0 eth0
10.48.0.0 * 255.255.252.0 U 0 0 0 eth0
3. Using systemd-networkd service[edit | edit source]
Systemd-networkd is a network service provided by systemd.
3.1. Ethernet interface[edit | edit source]
Systemd-networkd provides a directory on which the Ethernet interface must be configured via configuration file: /lib/systemd/network.
Board $> ls /lib/systemd/network 50-wired.network 52-static.network.static 80-container-vz.network 50-wired.network.static 80-container-host0.network 99-default.link 51-wireless.network.sample 80-container-ve.network
ST provide some configurations file:
- 50-wired.network: basic DHCP configuration for each ethX ethernet interface
- 50-wired.network.static: example of basic DHCP configuration on which eth0 are exclude of list
- 52-static.network.static: example of static IP configuration for eth0
3.2. Configuration file[edit | edit source]
Example of configuration:
DHCP configuration;
[Match]
Name=eth*
[Network]
DHCP=ipv4
Static IP configuration:
[Match] Name=eth0 [Network] DNS=192.168.72.254 Address=192.168.72.2/24 Gateway=192.168.72.254
[Match]
- MACAddress= a whitespace-separated list of hardware addresses
- Name= a white-space separated list of device names or expression (e.g. eth*).
- Host= the machine hostname
[NETWORK]
[Network]
- DHCP= enables the DHCP client, value can be: yes, no, ipv4, ipv6
- DHCPServer= enables the DHCP server for this configuration
- DNS= list DNS addresses in case of static configuration (you may specify several addresses)
- IPForward= configures IP packet forwarding, value can be: ipv4 or ipv6
- IPMasquerade= configures IP masquerading for the network interface. If enabled, packets forwarded from the network interface will be appear as coming from the local host. Takes a boolean argument. Implies IPForward=ipv4. Defaults to "no". Value can be yes or no.
All parameters are described on official documentation of systemd-networkd: [1]
3.3. DHCP configuration[edit | edit source]
DHCP configuration;
[Match]
Name=eth*
[Network]
DHCP=ipv4
All Ethernet interface are configured with DHCP client address.
3.4. STATIC configuration[edit | edit source]
Static configuration;
Add a new file 52-static.network with the following content
(/lib/systemd/network/50-wired.network or /lib/systemd/network/52-static.network)
[Match] Name=eth0 [Network] DNS=192.168.72.254 Address=192.168.72.2/24 Gateway=192.168.72.254
Eth0 Ethernet interface are configured with static IP address.
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In case of static configuration or specific configuration, please take care to not configure two time your Ethernet interface , with the static configuration example you need to exclude eth0 interface of default configuration (here 50-wired.network) |
Exclude eth0 from default Ethernet configuration:
Change the file 50-wired.network (or 80-wired.network) with the following content
(/lib/systemd/network/50-wired.network or /lib/systemd/network/80-wired.network)
[Match]
Name=eth[1-9]
[Network]
DHCP=ipv4
3.5. DHCP Server configuration[edit | edit source]
DHCP server example:
[Match] Name=eth0 [Network] Address=192.168.72.1/24 DHCPServer=yes IPForward=ipv4 IPMasquerade=yes
4. References[edit | edit source]