diff --git a/easytier/src/common/ifcfg.rs b/easytier/src/common/ifcfg.rs
index c5c540c6..df3c0707 100644
--- a/easytier/src/common/ifcfg.rs
+++ b/easytier/src/common/ifcfg.rs
@@ -384,6 +384,10 @@ impl IfConfiguerTrait for WindowsIfConfiger {
     }
 
     async fn set_mtu(&self, name: &str, mtu: u32) -> Result<(), Error> {
+        let _ = run_shell_cmd(
+            format!("netsh interface ipv6 set subinterface {} mtu={}", name, mtu).as_str(),
+        )
+        .await;
         run_shell_cmd(
             format!("netsh interface ipv4 set subinterface {} mtu={}", name, mtu).as_str(),
         )
diff --git a/easytier/src/instance/virtual_nic.rs b/easytier/src/instance/virtual_nic.rs
index 7515aa9b..510c0aab 100644
--- a/easytier/src/instance/virtual_nic.rs
+++ b/easytier/src/instance/virtual_nic.rs
@@ -243,7 +243,7 @@ pub struct VirtualNic {
     ifcfg: Box<dyn IfConfiguerTrait + Send + Sync + 'static>,
 }
 #[cfg(target_os = "windows")]
-pub fn checkreg(dev_name:&str) -> io::Result<()> {
+pub fn checkreg(dev_name: &str) -> io::Result<()> {
     use winreg::{enums::HKEY_LOCAL_MACHINE, enums::KEY_ALL_ACCESS, RegKey};
     let hklm = RegKey::predef(HKEY_LOCAL_MACHINE);
     let profiles_key = hklm.open_subkey_with_flags(
@@ -262,7 +262,9 @@ pub fn checkreg(dev_name:&str) -> io::Result<()> {
         // check if ProfileName contains "et"
         match subkey.get_value::<String, _>("ProfileName") {
             Ok(profile_name) => {
-                if profile_name.contains("et_") || (!dev_name.is_empty() && dev_name == profile_name) {
+                if profile_name.contains("et_")
+                    || (!dev_name.is_empty() && dev_name == profile_name)
+                {
                     keys_to_delete.push(subkey_name);
                 }
             }
@@ -280,7 +282,9 @@ pub fn checkreg(dev_name:&str) -> io::Result<()> {
         // check if ProfileName contains "et"
         match subkey.get_value::<String, _>("Description") {
             Ok(profile_name) => {
-                if profile_name.contains("et_") || (!dev_name.is_empty() && dev_name == profile_name) {
+                if profile_name.contains("et_")
+                    || (!dev_name.is_empty() && dev_name == profile_name)
+                {
                     keys_to_delete_unmanaged.push(subkey_name);
                 }
             }
@@ -357,7 +361,7 @@ impl VirtualNic {
                 .map(char::from)
                 .collect::<String>()
                 .to_lowercase();
-            
+
             if !dev_name.is_empty() {
                 config.tun_name(format!("{}", dev_name));
             } else {