====== systemd-networkd ======

===== VLANs =====
Parent device:
<file ini /etc/systemd/network/port1.network>
[Match]
Name=enp1s0f1
Type=ether

[Network]
Description=Network for uplink without IP
VLAN=uplink

# tagged only / no IP configuration
LinkLocalAddressing=no
LLDP=no
EmitLLDP=no
IPv6AcceptRA=no
IPv6SendRA=no
</file>

VLAN file:

<file ini /etc/systemd/network/uplink.netdev>
[NetDev]
Name=uplink
Kind=vlan

[VLAN]
Id=1337
</file>

Network configuration for RA/DHCPv6:

<file ini /etc/systemd/network/uplink.network>
[Match]
Name=uplink
Type=vlan

[Network]
Description=VLAN for uplink

DHCP=yes
[DHCPv6]
PrefixDelegationHint=::/59
</file>

===== further information =====
  * [[https://major.io/2021/07/28/dhcpv6-prefix-delegation-with-systemd-networkd/|DHCPv6 prefix delegation with systemd-networkd]]
  * [[https://blog.g3rt.nl/systemd-networkd-vlans-howto.html|How to do VLANs with systemd-networkd on Linux]]
  * [[https://blog.g3rt.nl/systemd-networkd-dhcpv6-pd-configuration.html|systemd-networkd to the rescue for DHCPv6 Prefix Delegation with Ziggo in the Netherlands]]