diff --git a/easytier/src/tunnel/mpsc.rs b/easytier/src/tunnel/mpsc.rs
index fb4f68c9..32c2dcfa 100644
--- a/easytier/src/tunnel/mpsc.rs
+++ b/easytier/src/tunnel/mpsc.rs
@@ -20,8 +20,14 @@ pub struct MpscTunnelSender(Sender<ZCPacket>);
 
 impl MpscTunnelSender {
     pub async fn send(&self, item: ZCPacket) -> Result<(), TunnelError> {
-        self.0.send(item).await.with_context(|| "send error")?;
-        Ok(())
+        match self.0.try_send(item) {
+            Ok(()) => Ok(()),
+            Err(TrySendError::Full(item)) => {
+                self.0.send(item).await.with_context(|| "send error")?;
+                Ok(())
+            }
+            Err(TrySendError::Closed(_)) => Err(TunnelError::Shutdown),
+        }
     }
 
     pub fn try_send(&self, item: ZCPacket) -> Result<(), TunnelError> {