diff --git a/go.mod b/go.mod
index dd114bfa..ab04fbaf 100644
--- a/go.mod
+++ b/go.mod
@@ -29,7 +29,7 @@ require (
 	github.com/sagernet/sing-dns v0.1.5-0.20230418025317-8a132998b322
 	github.com/sagernet/sing-shadowsocks v0.2.2-0.20230418025154-6114beeeba6d
 	github.com/sagernet/sing-shadowtls v0.1.2-0.20230417103049-4f682e05f19b
-	github.com/sagernet/sing-tun v0.1.4-0.20230418134942-3a2687c37597
+	github.com/sagernet/sing-tun v0.1.4-0.20230419011045-792eeb079312
 	github.com/sagernet/sing-vmess v0.1.5-0.20230417103030-8c3070ae3fb3
 	github.com/sagernet/smux v0.0.0-20230312102458-337ec2a5af37
 	github.com/sagernet/tfo-go v0.0.0-20230303015439-ffcfd8c41cf9
diff --git a/go.sum b/go.sum
index 7f17a6d6..641e26b6 100644
--- a/go.sum
+++ b/go.sum
@@ -119,8 +119,8 @@ github.com/sagernet/sing-shadowsocks v0.2.2-0.20230418025154-6114beeeba6d h1:UUx
 github.com/sagernet/sing-shadowsocks v0.2.2-0.20230418025154-6114beeeba6d/go.mod h1:Co3PJXcaZoLwHGBfT0rbSnn9C7ywc41zVYWtDeoeI/Q=
 github.com/sagernet/sing-shadowtls v0.1.2-0.20230417103049-4f682e05f19b h1:ouW/6IDCrxkBe19YSbdCd7buHix7b+UZ6BM4Zz74XF4=
 github.com/sagernet/sing-shadowtls v0.1.2-0.20230417103049-4f682e05f19b/go.mod h1:oG8bPerYI6cZ74KquY3DvA7ynECyrILPBnce6wtBqeI=
-github.com/sagernet/sing-tun v0.1.4-0.20230418134942-3a2687c37597 h1:2IJxBf9X8kSq/78KjfJwA16NC54Hwf4wVZZqldWQ+os=
-github.com/sagernet/sing-tun v0.1.4-0.20230418134942-3a2687c37597/go.mod h1:bvcVzlf9q9dgxt8qKluW+zOXCFoN1+SpBG3sHTq8/9Q=
+github.com/sagernet/sing-tun v0.1.4-0.20230419011045-792eeb079312 h1:yQAzMx+8CgW65V+EN/YnImw9DBLCRjDY4ZrVksb0M4w=
+github.com/sagernet/sing-tun v0.1.4-0.20230419011045-792eeb079312/go.mod h1:bvcVzlf9q9dgxt8qKluW+zOXCFoN1+SpBG3sHTq8/9Q=
 github.com/sagernet/sing-vmess v0.1.5-0.20230417103030-8c3070ae3fb3 h1:BHOnxrbC929JonuKqFdJ7ZbDp7zs4oTlH5KFvKtWu9U=
 github.com/sagernet/sing-vmess v0.1.5-0.20230417103030-8c3070ae3fb3/go.mod h1:yKrAr+dqZd64DxBXCHWrYicp+n4qbqO73mtwv3dck8U=
 github.com/sagernet/smux v0.0.0-20230312102458-337ec2a5af37 h1:HuE6xSwco/Xed8ajZ+coeYLmioq0Qp1/Z2zczFaV8as=
diff --git a/outbound/urltest.go b/outbound/urltest.go
index 28c6970f..580ab426 100644
--- a/outbound/urltest.go
+++ b/outbound/urltest.go
@@ -13,6 +13,7 @@ import (
 	"github.com/sagernet/sing-box/log"
 	"github.com/sagernet/sing-box/option"
 	"github.com/sagernet/sing/common"
+	"github.com/sagernet/sing/common/atomic"
 	"github.com/sagernet/sing/common/batch"
 	E "github.com/sagernet/sing/common/exceptions"
 	M "github.com/sagernet/sing/common/metadata"
@@ -140,6 +141,7 @@ type URLTestGroup struct {
 	interval  time.Duration
 	tolerance uint16
 	history   *urltest.HistoryStorage
+	checking  atomic.Bool
 
 	access sync.Mutex
 	ticker *time.Ticker
@@ -268,9 +270,13 @@ func (g *URLTestGroup) URLTest(ctx context.Context, link string) (map[string]uin
 }
 
 func (g *URLTestGroup) urlTest(ctx context.Context, link string, force bool) (map[string]uint16, error) {
+	result := make(map[string]uint16)
+	if g.checking.Swap(true) {
+		return result, nil
+	}
+	defer g.checking.Store(false)
 	b, _ := batch.New(ctx, batch.WithConcurrencyNum[any](10))
 	checked := make(map[string]bool)
-	result := make(map[string]uint16)
 	var resultAccess sync.Mutex
 	for _, detour := range g.outbounds {
 		tag := detour.Tag()
diff --git a/route/router.go b/route/router.go
index 1d37e154..9a7a99ca 100644
--- a/route/router.go
+++ b/route/router.go
@@ -299,18 +299,21 @@ func NewRouter(
 	if needInterfaceMonitor {
 		if !usePlatformDefaultInterfaceMonitor {
 			networkMonitor, err := tun.NewNetworkUpdateMonitor(router)
-			if err == nil {
+			if err != os.ErrInvalid {
+				if err != nil {
+					return nil, err
+				}
 				router.networkMonitor = networkMonitor
 				networkMonitor.RegisterCallback(router.interfaceFinder.update)
+				interfaceMonitor, err := tun.NewDefaultInterfaceMonitor(router.networkMonitor, tun.DefaultInterfaceMonitorOptions{
+					OverrideAndroidVPN: options.OverrideAndroidVPN,
+				})
+				if err != nil {
+					return nil, E.New("auto_detect_interface unsupported on current platform")
+				}
+				interfaceMonitor.RegisterCallback(router.notifyNetworkUpdate)
+				router.interfaceMonitor = interfaceMonitor
 			}
-			interfaceMonitor, err := tun.NewDefaultInterfaceMonitor(router.networkMonitor, tun.DefaultInterfaceMonitorOptions{
-				OverrideAndroidVPN: options.OverrideAndroidVPN,
-			})
-			if err != nil {
-				return nil, E.New("auto_detect_interface unsupported on current platform")
-			}
-			interfaceMonitor.RegisterCallback(router.notifyNetworkUpdate)
-			router.interfaceMonitor = interfaceMonitor
 		} else {
 			interfaceMonitor := platformInterface.CreateDefaultInterfaceMonitor(router)
 			interfaceMonitor.RegisterCallback(router.notifyNetworkUpdate)