From 0529910b01015332b0568342f82830baf52fe158 Mon Sep 17 00:00:00 2001
From: Neil Alexander <neilalexander@users.noreply.github.com>
Date: Sat, 23 Nov 2019 13:34:27 +0000
Subject: [PATCH] Reuse GUID so Windows no longer keeps creating new networks
 each time Yggdrasil starts

---
 src/tuntap/tun_windows.go | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/tuntap/tun_windows.go b/src/tuntap/tun_windows.go
index 7cedfc8..73ab398 100644
--- a/src/tuntap/tun_windows.go
+++ b/src/tuntap/tun_windows.go
@@ -24,8 +24,13 @@ func (tun *TunAdapter) setup(ifname string, addr string, mtu int) error {
 		ifname = defaults.GetDefaults().DefaultIfName
 	}
 	var err error
+	var iface wgtun.Device
 	err = doAsSystem(func() {
-		iface, err := wgtun.CreateTUN(ifname, mtu)
+		if guid, gerr := windows.GUIDFromString("{8f59971a-7872-4aa6-b2eb-061fc4e9d0a7}"); gerr == nil {
+			iface, err = wgtun.CreateTUNWithRequestedGUID(ifname, &guid, mtu)
+		} else {
+			panic(gerr)
+		}
 		if err != nil {
 			panic(err)
 		}