diff --git a/easytier/src/connector/udp_hole_punch.rs b/easytier/src/connector/udp_hole_punch.rs
index 89b1e3d..d8851ce 100644
--- a/easytier/src/connector/udp_hole_punch.rs
+++ b/easytier/src/connector/udp_hole_punch.rs
@@ -438,12 +438,12 @@ impl UdpHolePunchRpc for UdpHolePunchRpcService {
         }
 
         // send max k1 packets if we are predicting the dst port
-        let max_k1 = 60;
+        let max_k1 = 180;
         // send max k2 packets if we are sending to random port
         let max_k2 = rand::thread_rng().gen_range(600..800);
 
         // this means the NAT is allocating port in a predictable way
-        if max_port.abs_diff(min_port) <= 3 * max_k1 && round <= 6 && punch_predictablely {
+        if max_port.abs_diff(min_port) <= max_k1 && round <= 6 && punch_predictablely {
             let (min_port, max_port) = {
                 // round begin from 0. if round is even, we guess port in increasing order
                 let port_delta = (max_k1 as u32) / ip_count as u32;
@@ -879,7 +879,7 @@ impl UdpHolePunchConnector {
 
         let mut last_port_idx = rand::thread_rng().gen_range(0..data.shuffled_port_vec.len());
 
-        for round in 0..5 {
+        for round in 0..30 {
             let ret = rpc_stub
                 .try_punch_symmetric(
                     BaseController {},
diff --git a/easytier/src/gateway/udp_proxy.rs b/easytier/src/gateway/udp_proxy.rs
index 8307dcf..18e382e 100644
--- a/easytier/src/gateway/udp_proxy.rs
+++ b/easytier/src/gateway/udp_proxy.rs
@@ -182,7 +182,7 @@ impl UdpNatEntry {
                 &mut buf,
                 &src_v4,
                 len,
-                1256,
+                1200,
                 ip_id,
             )
             .await
@@ -350,7 +350,7 @@ impl UdpProxy {
         peer_manager: Arc<PeerManager>,
     ) -> Result<Arc<Self>, Error> {
         let cidr_set = CidrSet::new(global_ctx.clone());
-        let (sender, receiver) = channel(64);
+        let (sender, receiver) = channel(1024);
         let ret = Self {
             global_ctx,
             peer_manager,
diff --git a/easytier/src/tunnel/ring.rs b/easytier/src/tunnel/ring.rs
index c382c7d..7394932 100644
--- a/easytier/src/tunnel/ring.rs
+++ b/easytier/src/tunnel/ring.rs
@@ -26,7 +26,7 @@ use super::{
     StreamItem, Tunnel, TunnelConnector, TunnelError, TunnelInfo, TunnelListener,
 };
 
-static RING_TUNNEL_CAP: usize = 64;
+static RING_TUNNEL_CAP: usize = 128;
 static RING_TUNNEL_RESERVERD_CAP: usize = 4;
 
 type RingLock = parking_lot::Mutex<()>;
diff --git a/easytier/src/tunnel/udp.rs b/easytier/src/tunnel/udp.rs
index bde119e..df96ec2 100644
--- a/easytier/src/tunnel/udp.rs
+++ b/easytier/src/tunnel/udp.rs
@@ -293,8 +293,8 @@ impl UdpTunnelListenerData {
             return;
         }
 
-        let ring_for_send_udp = Arc::new(RingTunnel::new(32));
-        let ring_for_recv_udp = Arc::new(RingTunnel::new(32));
+        let ring_for_send_udp = Arc::new(RingTunnel::new(64));
+        let ring_for_recv_udp = Arc::new(RingTunnel::new(64));
         tracing::debug!(
             ?ring_for_send_udp,
             ?ring_for_recv_udp,