diff --git a/vnt/src/core/conn.rs b/vnt/src/core/conn.rs
index 5aa4755..7821c85 100644
--- a/vnt/src/core/conn.rs
+++ b/vnt/src/core/conn.rs
@@ -12,6 +12,7 @@ use crate::channel::context::ChannelContext;
 use crate::channel::idle::Idle;
 use crate::channel::punch::{NatInfo, Punch};
 use crate::channel::sender::IpPacketSender;
+use crate::channel::socket::LocalInterface;
 use crate::channel::{init_channel, init_context, Route, RouteKey};
 use crate::cipher::Cipher;
 #[cfg(feature = "server_encrypt")]
@@ -29,7 +30,7 @@ use crate::tun_tap_device::tun_create_helper::{DeviceAdapter, TunDeviceHelper};
 use crate::tun_tap_device::vnt_device::DeviceWrite;
 use crate::util::limit::TrafficMeterMultiAddress;
 use crate::util::{Scheduler, StopManager};
-use crate::{nat, VntCallback};
+use crate::{channel, nat, VntCallback};
 
 #[derive(Clone)]
 pub struct Vnt {
@@ -137,9 +138,16 @@ impl VntInner {
         } else {
             nat::local_ipv4()
         };
-
-        let default_interface = config.local_interface.clone();
-        log::info!("default_interface = {:?}", default_interface);
+        let default_interface = if config.in_ips.is_empty() {
+            //没有改变路由，不需要绑定网卡
+            LocalInterface::default()
+        } else {
+            //vnt的流量都走这个接口
+            let default_interface =
+                channel::socket::get_best_interface(local_ipv4.unwrap_or(Ipv4Addr::UNSPECIFIED))?;
+            log::info!("default_interface = {:?}", default_interface);
+            default_interface
+        };
 
         //基础信息
         let config_info = BaseConfigInfo::new(