# config for loopback networking
cat > $IFFILE << EOF
-# Initially generated on boot by initramfs
+# Initially generated on boot by initramfs,
+# interfaces(5) file used by ifup(8) and ifdown(8)
+
+# Include files from /etc/network/interfaces.d:
+source /etc/network/interfaces.d/*
auto lo
iface lo inet loopback