diff --git a/package/network/config/netifd/files/lib/netifd/proto/dhcp.sh b/package/network/config/netifd/files/lib/netifd/proto/dhcp.sh
index 1d3a209106..ea02d68bb4 100755
--- a/package/network/config/netifd/files/lib/netifd/proto/dhcp.sh
+++ b/package/network/config/netifd/files/lib/netifd/proto/dhcp.sh
@@ -21,14 +21,15 @@ proto_dhcp_init_config() {
 	proto_config_add_string zone
 	proto_config_add_string mtu6rd
 	proto_config_add_string customroutes
+	proto_config_add_boolean classlessroute
 }
 
 proto_dhcp_setup() {
 	local config="$1"
 	local iface="$2"
 
-	local ipaddr hostname clientid vendorid broadcast release reqopts iface6rd sendopts delegate zone6rd zone mtu6rd customroutes
-	json_get_vars ipaddr hostname clientid vendorid broadcast release reqopts iface6rd sendopts delegate zone6rd zone mtu6rd customroutes
+	local ipaddr hostname clientid vendorid broadcast release reqopts iface6rd sendopts delegate zone6rd zone mtu6rd customroutes classlessroute
+	json_get_vars ipaddr hostname clientid vendorid broadcast release reqopts iface6rd sendopts delegate zone6rd zone mtu6rd customroutes classlessroute
 
 	local opt dhcpopts
 	for opt in $reqopts; do
@@ -49,6 +50,8 @@ proto_dhcp_setup() {
 	[ -n "$mtu6rd" ] && proto_export "MTU6RD=$mtu6rd"
 	[ -n "$customroutes" ] && proto_export "CUSTOMROUTES=$customroutes"
 	[ "$delegate" = "0" ] && proto_export "IFACE6RD_DELEGATE=0"
+	# Request classless route option (see RFC 3442) by default
+	[ "$classlessroute" = "0" ] || append dhcpopts "-O 121"
 
 	proto_export "INTERFACE=$config"
 	proto_run_command "$config" udhcpc \