diff --git a/springboot-backend/src/main/java/com/admin/common/utils/GostUtil.java b/springboot-backend/src/main/java/com/admin/common/utils/GostUtil.java
index 5a1ff7f..e681359 100644
--- a/springboot-backend/src/main/java/com/admin/common/utils/GostUtil.java
+++ b/springboot-backend/src/main/java/com/admin/common/utils/GostUtil.java
@@ -333,10 +333,16 @@ public class GostUtil {
     }
 
     private static boolean supportsV4(Node node) {
+        // New dual-stack fields take precedence over legacy serverIp.
+        // If user explicitly provided only v6, treat as v6-only.
         if (StrUtil.isNotBlank(node.getServerIpV4())) {
             return true;
         }
 
+        if (StrUtil.isNotBlank(node.getServerIpV6())) {
+            return false;
+        }
+
         String legacy = node.getServerIp();
         if (StrUtil.isBlank(legacy)) {
             return false;
@@ -355,10 +361,16 @@ public class GostUtil {
     }
 
     private static boolean supportsV6(Node node) {
+        // New dual-stack fields take precedence over legacy serverIp.
+        // If user explicitly provided only v4, treat as v4-only.
         if (StrUtil.isNotBlank(node.getServerIpV6())) {
             return true;
         }
 
+        if (StrUtil.isNotBlank(node.getServerIpV4())) {
+            return false;
+        }
+
         String legacy = node.getServerIp();
         if (StrUtil.isBlank(legacy)) {
             return false;