From c8d55a620a7de3644e1a4e1b1506e18c6c588e6c Mon Sep 17 00:00:00 2001
From: wwqgtxx <wwqgtxx@gmail.com>
Date: Sun, 30 Oct 2022 12:56:31 +0800
Subject: [PATCH] Avoid choose ZeroTier's tap to defaultInterface

---
 monitor_windows.go | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/monitor_windows.go b/monitor_windows.go
index a930c53..bf3b24c 100644
--- a/monitor_windows.go
+++ b/monitor_windows.go
@@ -1,6 +1,7 @@
 package tun
 
 import (
+	"net/netip"
 	"sync"
 
 	"github.com/sagernet/sing-tun/internal/winipcfg"
@@ -10,6 +11,10 @@ import (
 	"golang.org/x/sys/windows"
 )
 
+// zeroTierFakeGatewayIp from
+// https://github.com/zerotier/ZeroTierOne/blob/1.8.6/osdep/WindowsEthernetTap.cpp#L994
+var zeroTierFakeGatewayIp = netip.MustParseAddr("25.255.255.254")
+
 type networkUpdateMonitor struct {
 	routeListener     *winipcfg.RouteChangeCallback
 	interfaceListener *winipcfg.InterfaceChangeCallback
@@ -67,6 +72,10 @@ func (m *defaultInterfaceMonitor) checkUpdate() error {
 	var index int
 
 	for _, row := range rows {
+		if row.NextHop.Addr() == zeroTierFakeGatewayIp {
+			continue
+		}
+
 		ifrow, err := row.InterfaceLUID.Interface()
 		if err != nil || ifrow.OperStatus != winipcfg.IfOperStatusUp {
 			continue