diff --git a/backend/wireguard/device.go b/backend/wireguard/device.go
index 9dd4fe7fb..2ebc88e0b 100644
--- a/backend/wireguard/device.go
+++ b/backend/wireguard/device.go
@@ -42,6 +42,7 @@ type wgDeviceAttrs struct {
 	psk        *wgtypes.Key
 	keepalive  *time.Duration
 	name       string
+	MTU        int
 }
 
 type wgDevice struct {
@@ -127,6 +128,7 @@ func newWGDevice(devAttrs *wgDeviceAttrs, ctx context.Context, wg *sync.WaitGrou
 	// Create network device
 	la := netlink.LinkAttrs{
 		Name: devAttrs.name,
+		MTU:  devAttrs.MTU,
 	}
 	link := &netlink.GenericLink{LinkAttrs: la, LinkType: "wireguard"}
 
diff --git a/backend/wireguard/wireguard.go b/backend/wireguard/wireguard.go
index 71fbc2039..f88ee2530 100644
--- a/backend/wireguard/wireguard.go
+++ b/backend/wireguard/wireguard.go
@@ -87,11 +87,12 @@ func newSubnetAttrs(publicIP net.IP, publicIPv6 net.IP, enableIPv4, enableIPv6 b
 	return leaseAttrs, nil
 }
 
-func createWGDev(ctx context.Context, wg *sync.WaitGroup, name string, psk string, keepalive *time.Duration, listenPort int) (*wgDevice, error) {
+func createWGDev(ctx context.Context, wg *sync.WaitGroup, name string, psk string, keepalive *time.Duration, listenPort int, mtu int) (*wgDevice, error) {
 	devAttrs := wgDeviceAttrs{
 		keepalive:  keepalive,
 		listenPort: listenPort,
 		name:       name,
+		MTU:        mtu,
 	}
 	err := devAttrs.setupKeys(psk)
 	if err != nil {
@@ -128,21 +129,21 @@ func (be *WireguardBackend) RegisterNetwork(ctx context.Context, wg *sync.WaitGr
 	var publicKey string
 	if cfg.Mode == Separate {
 		if config.EnableIPv4 {
-			dev, err = createWGDev(ctx, wg, "flannel-wg", cfg.PSK, &keepalive, cfg.ListenPort)
+			dev, err = createWGDev(ctx, wg, "flannel-wg", cfg.PSK, &keepalive, cfg.ListenPort, be.extIface.Iface.MTU)
 			if err != nil {
 				return nil, err
 			}
 			publicKey = dev.attrs.publicKey.String()
 		}
 		if config.EnableIPv6 {
-			v6Dev, err = createWGDev(ctx, wg, "flannel-wg-v6", cfg.PSK, &keepalive, cfg.ListenPortV6)
+			v6Dev, err = createWGDev(ctx, wg, "flannel-wg-v6", cfg.PSK, &keepalive, cfg.ListenPortV6, be.extIface.Iface.MTU)
 			if err != nil {
 				return nil, err
 			}
 			publicKey = dev.attrs.publicKey.String()
 		}
 	} else if cfg.Mode == Auto || cfg.Mode == Ipv4 || cfg.Mode == Ipv6 {
-		dev, err = createWGDev(ctx, wg, "flannel-wg", cfg.PSK, &keepalive, cfg.ListenPort)
+		dev, err = createWGDev(ctx, wg, "flannel-wg", cfg.PSK, &keepalive, cfg.ListenPort, be.extIface.Iface.MTU)
 		if err != nil {
 			return nil, err
 		}
diff --git a/pkg/ip/iface_windows.go b/pkg/ip/iface_windows.go
index 1f30f8a44..f8788151e 100644
--- a/pkg/ip/iface_windows.go
+++ b/pkg/ip/iface_windows.go
@@ -152,6 +152,7 @@ func IsForwardingEnabledForInterface(iface *net.Interface) (bool, error) {
 	return powerShellJsonData.Forwarding == 1, nil
 }
 
-func GetInterfaceByIP6(ip net.IP) (*net.Interface, error)         { return nil, nil }
-func GetInterfaceIP6Addrs(iface *net.Interface) ([]net.IP, error) { return nil, nil }
-func GetDefaultV6GatewayInterface() (*net.Interface, error)       { return nil, nil }
+func GetInterfaceByIP6(ip net.IP) (*net.Interface, error)                       { return nil, nil }
+func GetInterfaceIP6Addrs(iface *net.Interface) ([]net.IP, error)               { return nil, nil }
+func GetInterfaceBySpecificIPRouting(ip net.IP) (*net.Interface, net.IP, error) { return nil, nil, nil }
+func GetDefaultV6GatewayInterface() (*net.Interface, error)                     { return nil, nil }