diff --git a/easytier/src/connector/udp_hole_punch/common.rs b/easytier/src/connector/udp_hole_punch/common.rs
index cd225af..7aaba64 100644
--- a/easytier/src/connector/udp_hole_punch/common.rs
+++ b/easytier/src/connector/udp_hole_punch/common.rs
@@ -499,17 +499,27 @@ impl PunchHoleServerCommon {
             use_last = true;
         }
 
-        let locked = all_listener_sockets.lock().await;
+        let mut locked = all_listener_sockets.lock().await;
 
         let listener = if use_last {
-            locked.last()?
+            locked.last_mut()?
         } else {
             // use the listener that is active most recently
             locked
-                .iter()
+                .iter_mut()
                 .max_by_key(|listener| listener.last_active_time.load())?
         };
 
+        if listener.mapped_addr.ip().is_unspecified() {
+            tracing::info!("listener mapped addr is unspecified, trying to get mapped addr");
+            listener.mapped_addr = self
+                .get_global_ctx()
+                .get_stun_info_collector()
+                .get_udp_port_mapping(listener.mapped_addr.port())
+                .await
+                .ok()?;
+        }
+
         Some((listener.get_socket().await, listener.mapped_addr))
     }
 
diff --git a/easytier/src/peers/peer_conn.rs b/easytier/src/peers/peer_conn.rs
index 2cb8284..0389c91 100644
--- a/easytier/src/peers/peer_conn.rs
+++ b/easytier/src/peers/peer_conn.rs
@@ -282,9 +282,7 @@ impl PeerConn {
                             tracing::error!(?e, "peer conn send ctrl resp error");
                         }
                     } else {
-                        if zc_packet.is_lossy() {
-                            let _ = sender.try_send(zc_packet);
-                        } else if sender.send(zc_packet).await.is_err() {
+                        if sender.send(zc_packet).await.is_err() {
                             break;
                         }
                     }
diff --git a/easytier/src/peers/peer_manager.rs b/easytier/src/peers/peer_manager.rs
index 7139661..0a7ac78 100644
--- a/easytier/src/peers/peer_manager.rs
+++ b/easytier/src/peers/peer_manager.rs
@@ -185,7 +185,7 @@ impl PeerManager {
     ) -> Self {
         let my_peer_id = rand::random();
 
-        let (packet_send, packet_recv) = mpsc::channel(100);
+        let (packet_send, packet_recv) = mpsc::channel(128);
         let peers = Arc::new(PeerMap::new(
             packet_send.clone(),
             global_ctx.clone(),