diff --git a/switch/src/handle/punch_handler.rs b/switch/src/handle/punch_handler.rs
index 67b7107..a09b791 100644
--- a/switch/src/handle/punch_handler.rs
+++ b/switch/src/handle/punch_handler.rs
@@ -249,7 +249,7 @@ async fn res_symmetric_handle_loop(
     }
     match tokio::time::timeout(Duration::from_secs(30), receiver.recv()).await {
         Ok(_) => {}
-        Err(e) => {}
+        Err(_e) => {}
     }
     loop {
         tokio::select! {
diff --git a/switch/src/handle/udp_recv_handler.rs b/switch/src/handle/udp_recv_handler.rs
index 832e66a..3b3e891 100644
--- a/switch/src/handle/udp_recv_handler.rs
+++ b/switch/src/handle/udp_recv_handler.rs
@@ -32,7 +32,7 @@ pub async fn udp_recv_start<F>(
     udp: UdpSocket,
     server_addr: SocketAddr,
     other_sender: Sender<(SocketAddr, Vec<u8>)>,
-    mut tun_writer: TunWriter,
+    tun_writer: TunWriter,
     current_device: CurrentDeviceInfo,
     stop_fn: F,
 ) where
@@ -275,7 +275,7 @@ fn other_handle(
         }
         Protocol::Control => {
             match ControlPacket::new(net_packet.transport_protocol(), net_packet.payload())? {
-                ControlPacket::PingPacket(ping) => {
+                ControlPacket::PingPacket(_ping) => {
                     net_packet.set_transport_protocol(control_packet::Protocol::Pong.into());
                     udp.send_to(&net_packet.buffer()[..12], peer_addr)?;
                 }
diff --git a/switch/src/tun_device/mac.rs b/switch/src/tun_device/mac.rs
index a20f1a2..3d9f232 100644
--- a/switch/src/tun_device/mac.rs
+++ b/switch/src/tun_device/mac.rs
@@ -1,11 +1,11 @@
-use std::io;
-use std::io::{Error, Read, Write};
+
+
 use std::net::Ipv4Addr;
-use std::os::unix::process::CommandExt;
+
 use std::process::Command;
 
-use bytes::BufMut;
-use tun::platform::posix::{Reader, Writer};
+
+
 use tun::Device;
 
 use crate::tun_device::{TunReader, TunWriter};