diff --git a/README.md b/README.md
index 9d0f77f..a2ac936 100644
--- a/README.md
+++ b/README.md
@@ -87,6 +87,7 @@ python run.py -c /path/to/config.json
 * `default` 系统访问外网默认IP
 * `public`使用公网ip(使用公网API查询)
 * `nku` NKU网关ip(只支持ipv4)
+* `none` 不更新ipv4/ipv6的DNS解析
 
 ### 配置示例
 ```json
diff --git a/run.py b/run.py
index 7758903..58ab8ef 100755
--- a/run.py
+++ b/run.py
@@ -62,7 +62,9 @@ def get_ip(ip_type):
     get IP address
     """
     index = get_config('index' + ip_type) or "default"
-    if str(index).isdigit():  # local eth
+    if index == 'none':
+        return None
+    elif str(index).isdigit():  # local eth
         value = getattr(ip, "local_v" + ip_type)(index)
     elif any((c in index) for c in '*.:'):  # regex
         value = getattr(ip, "regex_v" + ip_type)(index)