diff --git a/target/linux/ar71xx/base-files/etc/defconfig/tl-mr3420/network b/target/linux/ar71xx/base-files/etc/defconfig/tl-mr3420/network
new file mode 100644
index 0000000000..de201bf5ec
--- /dev/null
+++ b/target/linux/ar71xx/base-files/etc/defconfig/tl-mr3420/network
@@ -0,0 +1,24 @@
+config interface loopback
+	option ifname	lo
+	option proto	static
+	option ipaddr	127.0.0.1
+	option netmask	255.0.0.0
+
+config interface lan
+	option ifname	eth0
+	option type	bridge
+	option proto	static
+	option ipaddr	192.168.1.1
+	option netmask	255.255.255.0
+
+config interface wan
+	option ifname	eth1
+	option proto	dhcp
+
+config switch eth0
+	option enable_vlan	1
+
+config switch_vlan
+	option device	eth0
+	option vlan	1
+	option ports	"0 1 2 3 4"