diff --git a/devices/gl-mt300a/default.nix b/devices/gl-mt300a/default.nix
index 040f99c5..4c888209 100644
--- a/devices/gl-mt300a/default.nix
+++ b/devices/gl-mt300a/default.nix
@@ -13,6 +13,7 @@
 
   module = { pkgs, ...}:
     let
+      inherit (pkgs.liminix.networking) interface;
       openwrt = pkgs.fetchFromGitHub {
         name = "openwrt-source";
         repo = "openwrt";
@@ -32,6 +33,22 @@
             "${openwrt}/target/linux/ramips/dts"
           ];
         };
+        networkInterfaces = {
+          # lan and wan ports are both behind a switch on eth0
+          eth = interface { device = "eth0"; };
+          lan = interface {
+            type = "vlan";
+            device = "eth0.1";
+            link = "eth0";
+            id = "1";
+          };
+          wan = interface {
+            type = "vlan";
+            device = "eth0.2";
+            id = "2";
+            link = "eth0";
+          };
+        };
       };
       boot.tftp = {
         loadAddress = "0x00A00000";
@@ -87,8 +104,16 @@
           NET_RALINK_MDIO_MT7620 = "y";
           NET_RALINK_MT7620 = "y";
 
+          # both the ethernet ports on this device (lan and wan)
+          # are behind a switch, so we need VLANs to do anything
+          # useful with them
+
+          VLAN_8021Q = "y";
           SWCONFIG = "y";
           SWPHY = "y";
+
+          BRIDGE_VLAN_FILTERING = "y";
+          BRIDGE_IGMP_SNOOPING = "y";
           NET_VENDOR_RALINK = "y";
 
           MTD = "y";
diff --git a/pkgs/liminix-tools/networking/default.nix b/pkgs/liminix-tools/networking/default.nix
index 04231735..22fe6dd0 100644
--- a/pkgs/liminix-tools/networking/default.nix
+++ b/pkgs/liminix-tools/networking/default.nix
@@ -8,11 +8,13 @@ let
   inherit (liminix.services) oneshot longrun;
   inherit (lib) concatStringsSep optional;
 in {
-  interface = { type ? "hardware", device, primary ? null, dependencies ? [] }  @ args:
+  interface = { type ? "hardware", device, link ? null, primary ? null, id ? null, dependencies ? [] }  @ args:
     let ups =
           []
           ++ optional (type == "bridge")
             "ip link add name ${device} type bridge"
+          ++ optional (type == "vlan")
+            "ip link add link ${link} name ${device} type vlan id ${id}"
           ++ ["${ifwait}/bin/ifwait -v ${device} present"]
           ++ ["ip link set up dev ${device}"]
           ++ optional (primary != null)