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Enrico Rossi

Systemd network easy configuration

Posted on in blog • 184 words • 1 minute read

Examples of systemd network configurations.

These are some collection of systemd network configuration. It does not require anything installed but systemd, not even ifupdown.

note: Debian 9 aka Stretch

Simple DHCP ethernet setup

Interface: eth0, file name is not important, but it must have the .network suffix.

/etc/systemd/network/wired.network

[Match]
Name=eth0

[Network]
DHCP=ipv4

fixed address

[Match]
Name=eth0

[Network]
Description="My fancy network configuration"
Address=10.10.10.20/24
Gateway=10.10.10.1
DNS=10.10.10.2
DNS=10.10.10.3
Domains=fancynetwork.internal
NTP=ntp.fancynetwork.internal

wireless interface

Authentication are managed by wpasupplicant and wpagui.

/etc/systemd/network/wireless.network

[Match]
Name=wlp3s0

[Network]
DHCP=ipv4

activate systemd networkd and resolved.

systemctl start systemd-networkd
systemctl enable systemd-networkd

systemctl start systemd-resolved
systemctl enable systemd-resolved

rm /etc/resolv.conf
ln -s /run/systemd/resolve/resolv.conf /etc/

systemctl status systemd-timesyncd

virtual bridge for VMs

/etc/systemd/network/bridge.netdev

[NetDev]
Name=br0
Kind=bridge

/etc/systemd/network/bridge.network

[Match]
Name=br0

[Network]
Address=10.123.45.1/24

VLAN interface

When your network is a particular vlan you receive on a tagged interface (trunk). Suppose eno1 is an interface you have connected to a trunk with many vlans and you want to use the vlan id 20.

/etc/systemd/network/eno1.network

[Match]
Name=eno1

[Network]
VLAN=eno1.20

/etc/systemd/network/eno1.20.netdev

[NetDev]
Name=eno1.20
Kind=vlan

[VLAN]
Id=20

/etc/systemd/network/eno1.20.network

[Match]
Name=eno1.20

[Network]
Description="My fancy network configuration"
Address=10.10.10.20/24
Gateway=10.10.10.1
DNS=10.10.10.2
DNS=10.10.10.3
Domains=fancynetwork.internal
NTP=ntp.fancynetwork.internal