From c5a0d186b02353882774cd9618723fe0086d5703 Mon Sep 17 00:00:00 2001
From: Logan oos Even <46396513+Logan007@users.noreply.github.com>
Date: Mon, 1 Feb 2021 19:28:40 +0545
Subject: [PATCH] handled metric default

---
 win32/wintap.c | 17 +++++++++--------
 1 file changed, 9 insertions(+), 8 deletions(-)

diff --git a/win32/wintap.c b/win32/wintap.c
index e8aae2e..bb9304d 100644
--- a/win32/wintap.c
+++ b/win32/wintap.c
@@ -315,16 +315,17 @@ int open_wintap(struct tuntap_dev *device,
 
   /* metric */
 
-  device->metric = metric;
+  if(metric) { /* try to change only if a value has been given, otherwise leave with default or as set before */
+    device->metric = metric;
 
-  _snprintf(cmd, sizeof(cmd),
-    "netsh interface ipv4 set interface \"%s\" metric=%d > nul",
-    device->ifName, device->metric);
-
-  if(system(cmd) != 0)
-    printf("WARNING: Unable to set device %s parameters metric=%d [%s]\n",
-      device->ifName, device->metric, cmd);
+    _snprintf(cmd, sizeof(cmd),
+      "netsh interface ipv4 set interface \"%s\" metric=%d > nul",
+      device->ifName, device->metric);
 
+    if(system(cmd) != 0)
+      printf("WARNING: Unable to set device %s parameters metric=%d [%s]\n",
+        device->ifName, device->metric, cmd);
+  }
 
   /* ****************** */