From ef640ed309c831fa8f6d092e9507dedc8ffb097a Mon Sep 17 00:00:00 2001
From: xqzr <34030394+xqzr@users.noreply.github.com>
Date: Wed, 27 Aug 2025 17:36:33 +0800
Subject: [PATCH] checkSystemNetwork(): Use c.root-servers.net (#5059)

---
 app/dns/dns.go | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/app/dns/dns.go b/app/dns/dns.go
index 1395231d..37183aba 100644
--- a/app/dns/dns.go
+++ b/app/dns/dns.go
@@ -329,7 +329,7 @@ func init() {
 }
 
 func checkSystemNetwork() (supportIPv4 bool, supportIPv6 bool) {
-	conn4, err4 := net.Dial("udp4", "8.8.8.8:53")
+	conn4, err4 := net.Dial("udp4", "192.33.4.12:53")
 	if err4 != nil {
 		supportIPv4 = false
 	} else {
@@ -337,7 +337,7 @@ func checkSystemNetwork() (supportIPv4 bool, supportIPv6 bool) {
 		conn4.Close()
 	}
 
-	conn6, err6 := net.Dial("udp6", "[2001:4860:4860::8888]:53")
+	conn6, err6 := net.Dial("udp6", "[2001:500:2::c]:53")
 	if err6 != nil {
 		supportIPv6 = false
 	} else {