From 4f064aba6aa9eb8d9efd0d3c878d4c4fb8e2a043 Mon Sep 17 00:00:00 2001
From: Zxneric <87642935+Zxneric@users.noreply.github.com>
Date: Wed, 13 Nov 2024 16:01:10 +0000
Subject: [PATCH] remove dns if no address was set

---
 tun_windows.go | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/tun_windows.go b/tun_windows.go
index 392b78c..294bc3a 100644
--- a/tun_windows.go
+++ b/tun_windows.go
@@ -84,6 +84,12 @@ func (t *NativeTun) configure() error {
 				}
 			}
 		}
+	} else {
+		// If no IPv4 address is set, remove any existing IPv4 DNS servers
+		err := luid.SetDNS(winipcfg.AddressFamily(windows.AF_INET), nil, nil)
+		if err != nil {
+			return E.Cause(err, "remove ipv4 dns")
+		}
 	}
 	if len(t.options.Inet6Address) > 0 {
 		err := luid.SetIPAddressesForFamily(winipcfg.AddressFamily(windows.AF_INET6), t.options.Inet6Address)
@@ -102,6 +108,12 @@ func (t *NativeTun) configure() error {
 				}
 			}
 		}
+	} else {
+		// If no IPv6 address is set, remove any existing IPv6 DNS servers
+		err := luid.SetDNS(winipcfg.AddressFamily(windows.AF_INET6), nil, nil)
+		if err != nil {
+			return E.Cause(err, "remove ipv6 dns")
+		}
 	}
 	if len(t.options.Inet4Address) > 0 || len(t.options.Inet6Address) > 0 {
 		_ = luid.DisableDNSRegistration()