diff --git a/src/args.rs b/src/args.rs
index eb60b90..165bd58 100644
--- a/src/args.rs
+++ b/src/args.rs
@@ -1,7 +1,6 @@
 use crate::{Error, Result};
 use socks5_impl::protocol::UserKey;
 use std::net::{IpAddr, SocketAddr, ToSocketAddrs};
-use tproxy_config::TUN_NAME;
 
 #[derive(Debug, Clone, clap::Parser)]
 #[command(author, version, about = "Tunnel interface to proxy.", long_about = None)]
@@ -12,9 +11,10 @@ pub struct Args {
     #[arg(short, long, value_parser = ArgProxy::from_url, value_name = "URL")]
     pub proxy: ArgProxy,
 
-    /// Name of the tun interface
-    #[arg(short, long, value_name = "name", conflicts_with = "tun_fd", default_value = TUN_NAME)]
-    pub tun: String,
+    /// Name of the tun interface, such as tun0, utun4, etc.
+    /// If this option is not provided, the OS will generate a random one.
+    #[arg(short, long, value_name = "name", conflicts_with = "tun_fd")]
+    pub tun: Option<String>,
 
     /// File descriptor of the tun interface
     #[arg(long, value_name = "fd", conflicts_with = "tun")]
@@ -25,8 +25,8 @@ pub struct Args {
     pub ipv6_enabled: bool,
 
     #[arg(short, long)]
-    /// Routing and system setup, which decides whether to setup the routing and system configuration,
-    /// this option requires root privileges. This option is only available on Linux.
+    /// Routing and system setup, which decides whether to setup the routing and system configuration.
+    /// This option is only available on Linux and requires root privileges.
     pub setup: bool,
 
     /// DNS handling strategy
@@ -50,7 +50,7 @@ impl Default for Args {
     fn default() -> Self {
         Args {
             proxy: ArgProxy::default(),
-            tun: TUN_NAME.to_string(),
+            tun: None,
             tun_fd: None,
             ipv6_enabled: false,
             setup: false,
@@ -89,7 +89,7 @@ impl Args {
     }
 
     pub fn tun(&mut self, tun: String) -> &mut Self {
-        self.tun = tun;
+        self.tun = Some(tun);
         self
     }
 
diff --git a/src/desktop_api.rs b/src/desktop_api.rs
index 5c66dca..4763a5f 100644
--- a/src/desktop_api.rs
+++ b/src/desktop_api.rs
@@ -6,7 +6,7 @@ use crate::{
 };
 use std::os::raw::{c_char, c_int};
 use tproxy_config::{TproxyArgs, TUN_GATEWAY, TUN_IPV4, TUN_NETMASK};
-use tun2::DEFAULT_MTU as MTU;
+use tun2::{AbstractDevice, DEFAULT_MTU as MTU};
 
 static TUN_QUIT: std::sync::Mutex<Option<tokio_util::sync::CancellationToken>> = std::sync::Mutex::new(None);
 
@@ -84,8 +84,8 @@ pub async fn desktop_run_async(args: Args, shutdown_token: tokio_util::sync::Can
     config.destination(TUN_GATEWAY);
     if let Some(tun_fd) = args.tun_fd {
         config.raw_fd(tun_fd);
-    } else {
-        config.name(&args.tun);
+    } else if let Some(ref tun) = args.tun {
+        config.tun_name(tun);
     }
 
     #[cfg(target_os = "linux")]
@@ -105,32 +105,27 @@ pub async fn desktop_run_async(args: Args, shutdown_token: tokio_util::sync::Can
         .tun_dns(args.dns_addr)
         .proxy_addr(args.proxy.addr)
         .bypass_ips(&bypass_ips);
-    #[allow(unused_assignments)]
-    if args.tun_fd.is_none() {
-        tproxy_args = tproxy_args.tun_name(&args.tun);
-    }
 
     #[allow(unused_mut, unused_assignments, unused_variables)]
     let mut setup = true;
 
     let device = tun2::create_as_async(&config)?;
 
+    if let Ok(tun_name) = device.as_ref().tun_name() {
+        tproxy_args = tproxy_args.tun_name(&tun_name);
+    }
+
     #[cfg(target_os = "linux")]
     {
         setup = args.setup;
-        if setup {
-            log::trace!("Entering route setup");
-            tproxy_config::tproxy_setup(&tproxy_args)?;
-        }
     }
 
-    #[cfg(any(target_os = "windows", target_os = "macos"))]
+    #[cfg(any(target_os = "linux", target_os = "windows", target_os = "macos"))]
     if setup {
+        log::trace!("Entering route setup");
         tproxy_config::tproxy_setup(&tproxy_args)?;
     }
 
-    log::info!("Proxy {} server: {}", args.proxy.proxy_type, args.proxy.addr);
-
     let join_handle = tokio::spawn(crate::run(device, MTU, args, shutdown_token));
     join_handle.await.map_err(std::io::Error::from)??;
 
diff --git a/src/lib.rs b/src/lib.rs
index 283a74c..ce816db 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -47,6 +47,8 @@ mod virtual_dns;
 const DNS_PORT: u16 = 53;
 
 const MAX_SESSIONS: u64 = 200;
+const TCP_TIMEOUT_SEC: u64 = 600; // 10 minutes
+const UDP_TIMEOUT_SEC: u64 = 10; // 10 seconds
 
 static TASK_COUNT: std::sync::atomic::AtomicU64 = std::sync::atomic::AtomicU64::new(0);
 use std::sync::atomic::Ordering::Relaxed;
@@ -61,6 +63,8 @@ pub async fn run<D>(device: D, mtu: u16, args: Args, shutdown_token: Cancellatio
 where
     D: AsyncRead + AsyncWrite + Unpin + Send + 'static,
 {
+    log::info!("Proxy {} server: {}", args.proxy.proxy_type, args.proxy.addr);
+
     let server_addr = args.proxy.addr;
     let key = args.proxy.credentials.clone();
     let dns_addr = args.dns_addr;
@@ -80,8 +84,8 @@ where
 
     let mut ipstack_config = ipstack::IpStackConfig::default();
     ipstack_config.mtu(mtu);
-    ipstack_config.tcp_timeout(std::time::Duration::from_secs(600)); // 10 minutes
-    ipstack_config.udp_timeout(std::time::Duration::from_secs(10)); // 10 seconds
+    ipstack_config.tcp_timeout(std::time::Duration::from_secs(TCP_TIMEOUT_SEC));
+    ipstack_config.udp_timeout(std::time::Duration::from_secs(UDP_TIMEOUT_SEC));
 
     let mut ip_stack = ipstack::IpStack::new(ipstack_config, device);
 
diff --git a/src/mobile_api.rs b/src/mobile_api.rs
index dabfa84..bf2573c 100644
--- a/src/mobile_api.rs
+++ b/src/mobile_api.rs
@@ -23,8 +23,6 @@ pub fn mobile_run(args: Args, tun_mtu: u16) -> c_int {
     }
 
     let block = async move {
-        log::info!("Proxy {} server: {}", args.proxy.proxy_type, args.proxy.addr);
-
         let mut config = tun2::Configuration::default();
 
         #[cfg(unix)]