diff --git a/netmode/files/etc/netmodes/routed-dhcp/scripts/10-routed-dhcp b/netmode/files/etc/netmodes/routed-dhcp/scripts/10-routed-dhcp
index 018034a37..bd05ee408 100644
--- a/netmode/files/etc/netmodes/routed-dhcp/scripts/10-routed-dhcp
+++ b/netmode/files/etc/netmodes/routed-dhcp/scripts/10-routed-dhcp
@@ -59,6 +59,8 @@ l3_network_config() {
 	uci -q set network.wan.device="$wandev"
 	uci -q set network.wan6.device="$wandev"
 
+	uci -q set network.wan.mtu="$NETMODE_mtu"
+
 	uci -q delete network.wan.dns
 	if [ -n "$NETMODE_dns_servers" ]; then
 		dns_servers="$(echo $NETMODE_dns_servers | tr ',' ' ')"
diff --git a/netmode/files/etc/netmodes/routed-pppoe/scripts/10-routed-pppoe b/netmode/files/etc/netmodes/routed-pppoe/scripts/10-routed-pppoe
index 38745eb65..c6bf7ea13 100644
--- a/netmode/files/etc/netmodes/routed-pppoe/scripts/10-routed-pppoe
+++ b/netmode/files/etc/netmodes/routed-pppoe/scripts/10-routed-pppoe
@@ -57,6 +57,8 @@ l3_network_pppoe_config() {
 	uci -q set network.wan.device="$wandev"
 	uci -q set network.wan6.device="$wandev"
 
+	uci -q set network.wan.mtu="$NETMODE_mtu"
+
 	uci -q delete network.wan.dns
 	if [ -n "$NETMODE_dns_servers" ]; then
 		dns_servers="$(echo $NETMODE_dns_servers | tr ',' ' ')"
diff --git a/netmode/files/etc/netmodes/routed-static/scripts/10-routed-static b/netmode/files/etc/netmodes/routed-static/scripts/10-routed-static
index e8b49b2ef..5f9fafc81 100644
--- a/netmode/files/etc/netmodes/routed-static/scripts/10-routed-static
+++ b/netmode/files/etc/netmodes/routed-static/scripts/10-routed-static
@@ -58,6 +58,8 @@ l3_network_config() {
 	uci -q set network.wan.device="$wandev"
 	uci -q set network.wan6.device="$wandev"
 
+	uci -q set network.wan.mtu="$NETMODE_mtu"
+
 	uci -q delete network.wan.dns
 	if [ -n "$NETMODE_dns_servers" ]; then
 		dns_servers="$(echo $NETMODE_dns_servers | tr ',' ' ')"
diff --git a/netmode/files/etc/netmodes/supported_modes.json b/netmode/files/etc/netmodes/supported_modes.json
index 5cf14f104..c2d51d439 100644
--- a/netmode/files/etc/netmodes/supported_modes.json
+++ b/netmode/files/etc/netmodes/supported_modes.json
@@ -43,6 +43,12 @@
           "required": false,
           "type": "integer"
         },
+        {
+          "name": "mtu",
+          "description": "MTU",
+          "required": false,
+          "type": "integer"
+        },
         {
           "name": "dns_servers",
           "description": "DNS Servers",