diff --git a/package/network/config/netifd/files/lib/netifd/dhcp.script b/package/network/config/netifd/files/lib/netifd/dhcp.script
index 593fb93e1d..90fa6d3054 100755
--- a/package/network/config/netifd/files/lib/netifd/dhcp.script
+++ b/package/network/config/netifd/files/lib/netifd/dhcp.script
@@ -65,6 +65,7 @@ setup_interface () {
 		[ -n "$IFACE6RD_DELEGATE" ] && json_add_boolean delegate "$IFACE6RD_DELEGATE"
 		[ -n "$ZONE6RD" ] || ZONE6RD=$ZONE
 		[ -n "$ZONE6RD" ] && json_add_string zone "$ZONE6RD"
+		[ -n "$MTU6RD" ] && json_add_string mtu "$MTU6RD"
 		json_close_object
 
 		ubus call network add_dynamic "$(json_dump)"
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 b14f7be92d..6668b49c21 100755
--- a/package/network/config/netifd/files/lib/netifd/proto/dhcp.sh
+++ b/package/network/config/netifd/files/lib/netifd/proto/dhcp.sh
@@ -18,14 +18,15 @@ proto_dhcp_init_config() {
 	proto_config_add_boolean delegate
 	proto_config_add_string zone6rd
 	proto_config_add_string zone
+	proto_config_add_string mtu6rd
 }
 
 proto_dhcp_setup() {
 	local config="$1"
 	local iface="$2"
 
-	local ipaddr hostname clientid vendorid broadcast reqopts iface6rd sendopts delegate zone6rd zone
-	json_get_vars ipaddr hostname clientid vendorid broadcast reqopts iface6rd sendopts delegate zone6rd zone
+	local ipaddr hostname clientid vendorid broadcast reqopts iface6rd sendopts delegate zone6rd zone mtu6rd
+	json_get_vars ipaddr hostname clientid vendorid broadcast reqopts iface6rd sendopts delegate zone6rd zone mtu6rd
 
 	local opt dhcpopts
 	for opt in $reqopts; do
@@ -42,6 +43,7 @@ proto_dhcp_setup() {
 	[ -n "$iface6rd" ] && append dhcpopts "-O 212"
 	[ -n "$zone6rd" ] && proto_export "ZONE6RD=$zone6rd"
 	[ -n "$zone" ] && proto_export "ZONE=$zone"
+	[ -n "$mtu6rd" ] && proto_export "MTU6RD=$mtu6rd"
 	[ "$delegate" = "0" ] && proto_export "IFACE6RD_DELEGATE=0"
 
 	proto_export "INTERFACE=$config"