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systemd-networkd: default to DUIDType=link-layer for ipv6; via networkd.conf.d #7232

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Sep 14, 2024
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systemd-networkd: default to DUIDType=link-layer for ipv6; via networkd.conf.d #7232

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9 changes: 9 additions & 0 deletions extensions/network/config-networkd/systemd/networkd.conf.d/mac-duid.conf
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Original file line number Diff line number Diff line change
@@ -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
9 changes: 8 additions & 1 deletion extensions/network/net-systemd-networkd.sh
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Expand Up @@ -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/*
}