diff --git a/extensions/network/config-networkd/systemd/networkd.conf.d/mac-duid.conf b/extensions/network/config-networkd/systemd/networkd.conf.d/mac-duid.conf
new file mode 100644
index 000000000000..b336599b790e
--- /dev/null
+++ b/extensions/network/config-networkd/systemd/networkd.conf.d/mac-duid.conf
@@ -0,0 +1,9 @@
+# Use LL (link-layer, sans timestamp) DUIDs for DHCP.
+# It is the default for v4, but not for v6.
+# Having it set to LL allows network admins to do MAC-based reservations for v6 the same way there's done for v4.
+# If the MAC address of an interface is 01:02:03:04:05:06, then the DUID will be 00030001010203040506
+[DHCPv4]
+DUIDType=link-layer
+
+[DHCPv6]
+DUIDType=link-layer
diff --git a/extensions/network/net-systemd-networkd.sh b/extensions/network/net-systemd-networkd.sh
index cf6de67fc78c..a059b77b4b7e 100644
--- a/extensions/network/net-systemd-networkd.sh
+++ b/extensions/network/net-systemd-networkd.sh
@@ -24,12 +24,19 @@ function pre_install_kernel_debs__configure_systemd_networkd() {
 	local netplan_config_src_folder="${EXTENSION_DIR}/config-networkd/netplan/"
 	local netplan_config_dst_folder="${SDCARD}/etc/netplan/"
 
+	run_host_command_logged cp -v "${netplan_config_src_folder}"* "${netplan_config_dst_folder}"
+
 	local networkd_config_src_folder="${EXTENSION_DIR}/config-networkd/systemd/network/"
 	local networkd_config_dst_folder="${SDCARD}/etc/systemd/network/"
 
-	run_host_command_logged cp -v "${netplan_config_src_folder}"* "${netplan_config_dst_folder}"
 	run_host_command_logged cp -v "${networkd_config_src_folder}"* "${networkd_config_dst_folder}"
 
+	local networkd_conf_d_config_src_folder="${EXTENSION_DIR}/config-networkd/systemd/networkd.conf.d/"
+	local networkd_conf_d_config_dst_folder="${SDCARD}/etc/systemd/networkd.conf.d/"
+
+	mkdir -p "${networkd_conf_d_config_dst_folder}" # This doesn't exist by default, create it
+	run_host_command_logged cp -v "${networkd_conf_d_config_src_folder}"* "${networkd_conf_d_config_dst_folder}"
+
 	# Change the file permissions according to https://netplan.readthedocs.io/en/stable/security/
 	chmod -v 600 "${SDCARD}"/etc/netplan/*
 }