diff --git a/windows-set-netconf.bat b/windows-set-netconf.bat
index 07fe54d..2ee680c 100644
--- a/windows-set-netconf.bat
+++ b/windows-set-netconf.bat
@@ -12,72 +12,90 @@ rem set ipv6_dns2=::2
 
 @echo off
 mode con cp select=437 >nul
-setlocal EnableDelayedExpansion
 
 rem 禁用 IPv6 地址标识符的随机化，防止 IPv6 和后台面板不一致
 netsh interface ipv6 set global randomizeidentifiers=disabled
 
 rem 检查是否定义了 MAC 地址
-if defined mac_addr (
-    rem vista 没有自带 powershell
-    rem win11 24h2 安装后有 wmic，但是过一段时间会自动删除，因此有的 dd 镜像没有 wmic
-    if exist "%windir%\system32\wbem\wmic.exe" (
-        for /f "tokens=2 delims==" %%a in (
-            'wmic nic where "MACAddress='%mac_addr%'" get InterfaceIndex /format:list ^| findstr /r "^InterfaceIndex=[0-9][0-9]*$"'
-        ) do set id=%%a
-    )
-    if not defined id (
-        for /f %%a in ('powershell -NoLogo -NoProfile -NonInteractive -ExecutionPolicy Bypass ^
-            -Command "(Get-WmiObject Win32_NetworkAdapter | Where-Object { $_.MACAddress -eq '%mac_addr%' }).InterfaceIndex" ^| findstr /r "^[0-9][0-9]*$"'
-        ) do set id=%%a
-    )
-    if not defined id (
-        for /f %%a in ('powershell -NoLogo -NoProfile -NonInteractive -ExecutionPolicy Bypass ^
-            -Command "(Get-CimInstance Win32_NetworkAdapter | Where-Object { $_.MACAddress -eq '%mac_addr%' }).InterfaceIndex" ^| findstr /r "^[0-9][0-9]*$"'
-        ) do set id=%%a
-    )
-    if defined id (
-        rem 配置静态 IPv4 地址和网关
-        if defined ipv4_addr if defined ipv4_gateway (
-        rem gwmetric 默认值为 1，自动跃点需设为 0
-            netsh interface ipv4 set address !id! static !ipv4_addr! gateway=!ipv4_gateway! gwmetric=0
-        )
+if not defined mac_addr goto :del
 
-        rem 配置静态 IPv4 DNS 服务器
-        for %%i in (1, 2) do (
-            if defined ipv4_dns%%i (
-                netsh interface ipv4 add | findstr "dnsservers"
-                if ErrorLevel 1 (
-                    rem vista
-                    netsh interface ipv4 add dnsserver !id! !ipv4_dns%%i! %%i
-                ) else (
-                    rem win7
-                    netsh interface ipv4 add dnsservers !id! !ipv4_dns%%i! %%i no
-                )
+rem vista 没有自带 powershell
+rem win11 24h2 安装后有 wmic，但是过一段时间会自动删除，因此有的 dd 镜像没有 wmic
+if exist "%windir%\system32\wbem\wmic.exe" (
+    rem wmic 换行符是 \r\r\n
+    rem 虽然这里用了 findstr 全字匹配 ，但是结尾还是有 \r
+    for /f "tokens=2 delims==" %%a in (
+        'wmic nic where "MACAddress='%mac_addr%'" get InterfaceIndex /format:list ^| findstr "^InterfaceIndex=[0-9][0-9]*$"'
+    ) do set id=%%a
+)
+
+if not defined id (
+    for /f %%a in ('powershell -NoLogo -NoProfile -NonInteractive -ExecutionPolicy Bypass ^
+        -Command "(Get-WmiObject Win32_NetworkAdapter | Where-Object { $_.MACAddress -eq '%mac_addr%' }).InterfaceIndex" ^| findstr "^[0-9][0-9]*$"'
+    ) do set id=%%a
+)
+
+if not defined id (
+    for /f %%a in ('powershell -NoLogo -NoProfile -NonInteractive -ExecutionPolicy Bypass ^
+        -Command "(Get-CimInstance Win32_NetworkAdapter | Where-Object { $_.MACAddress -eq '%mac_addr%' }).InterfaceIndex" ^| findstr "^[0-9][0-9]*$"'
+    ) do set id=%%a
+)
+
+if defined id (
+    rem 配置静态 IPv4 地址和网关
+    if defined ipv4_addr if defined ipv4_gateway (
+        rem 如果使用了 setlocal EnableDelayedExpansion
+        rem netsh interface ipv4 set address !id! static %ipv4_addr% gateway=%ipv4_gateway% gwmetric=0
+        rem !id! 变量最后有 \r 会导致语句不正确
+        rem %id% 变量则没有这个问题
+
+        rem gwmetric 默认值为 1，自动跃点需设为 0
+        netsh interface ipv4 set address %id% static %ipv4_addr% gateway=%ipv4_gateway% gwmetric=0
+    )
+
+    rem 配置静态 IPv4 DNS 服务器
+    for %%i in (1, 2) do (
+        if defined ipv4_dns%%i (
+            netsh interface ipv4 add | findstr "dnsservers" >nul
+            if ErrorLevel 1 (
+                rem vista
+                setlocal EnableDelayedExpansion
+                netsh interface ipv4 add dnsserver %id% !ipv4_dns%%i! %%i
+                endlocal
+            ) else (
+                rem win7
+                setlocal EnableDelayedExpansion
+                netsh interface ipv4 add dnsservers %id% !ipv4_dns%%i! %%i no
+                endlocal
             )
         )
+    )
 
-        rem 配置 IPv6 地址和网关
-        if defined ipv6_addr if defined ipv6_gateway (
-            netsh interface ipv6 set address !id! !ipv6_addr!
-            netsh interface ipv6 add route prefix=::/0 !id! !ipv6_gateway!
-        )
+    rem 配置 IPv6 地址和网关
+    if defined ipv6_addr if defined ipv6_gateway (
+        netsh interface ipv6 set address %id% %ipv6_addr%
+        netsh interface ipv6 add route prefix=::/0 %id% %ipv6_gateway%
+    )
 
-        rem 配置 IPv6 DNS 服务器
-        for %%i in (1, 2) do (
-            if defined ipv6_dns%%i (
-                netsh interface ipv6 add | findstr "dnsservers"
-                if ErrorLevel 1 (
-                    rem vista
-                    netsh interface ipv6 add dnsserver !id! !ipv6_dns%%i! %%i
-                ) else (
-                    rem win7
-                    netsh interface ipv6 add dnsservers !id! !ipv6_dns%%i! %%i no
-                )
+    rem 配置 IPv6 DNS 服务器
+    for %%i in (1, 2) do (
+        if defined ipv6_dns%%i (
+            netsh interface ipv6 add | findstr "dnsservers" >nul
+            if ErrorLevel 1 (
+                rem vista
+                setlocal EnableDelayedExpansion
+                netsh interface ipv6 add dnsserver %id% !ipv6_dns%%i! %%i
+                endlocal
+            ) else (
+                rem win7
+                setlocal EnableDelayedExpansion
+                netsh interface ipv6 add dnsservers %id% !ipv6_dns%%i! %%i no
+                endlocal
             )
         )
     )
 )
 
+:del
 rem 删除此脚本
 del "%~f0"