diff --git a/message.proto b/message.proto
index 348fe24..ddc66e6 100644
--- a/message.proto
+++ b/message.proto
@@ -71,7 +71,8 @@ message SDLSendRegisterEvent {
     bytes dst_mac = 1;
     uint32 nat_ip = 2;
     uint32 nat_port = 3;
-    optional SDLV6Info v6_info = 4;
+    uint32 nat_type = 4;
+    optional SDLV6Info v6_info = 5;
 }
 
 message SDLNetworkShutdownEvent {
diff --git a/src/network/node.rs b/src/network/node.rs
index 6ddd1da..afaa0d2 100644
--- a/src/network/node.rs
+++ b/src/network/node.rs
@@ -595,6 +595,8 @@ pub struct EdgePeer {
     // pub mac: Mac,
     pub dev_addr: IpSubnet,
 
+    pub nat_type: RwLock<NatType>,
+
     // 对端对外开放的ip和端口信息
     pub sock: RwLock<SdlanSock>,
     // peer's ipv6 info
@@ -644,6 +646,11 @@ impl EdgePeer {
             last_seen: AtomicU64::new(0),
             _last_valid_timestamp: AtomicU64::new(now),
             last_sent_query: AtomicU64::new(0),
+            nat_type: RwLock::new(NatType::Invalid),
         }
     }
+
+    pub fn get_nat_type(&self) -> NatType {
+        *self.nat_type.read().unwrap()
+    }
 }
diff --git a/src/network/packet.rs b/src/network/packet.rs
index a168a22..ee10597 100644
--- a/src/network/packet.rs
+++ b/src/network/packet.rs
@@ -1,5 +1,6 @@
 use std::{net::SocketAddr, sync::atomic::Ordering, time::Duration};
 
+use crate::tcp::NatType;
 use crate::{network::TunTapPacketHandler, utils::mac_to_string};
 
 use crate::{
@@ -254,7 +255,11 @@ pub async fn handle_packet_peer_info(
         error!("failed to convert v4");
         return Ok(());
     };
-    let remote_nat = v4.nat_type;
+    let remote_nat_byte = v4.nat_type as u8;
+    let remote_nat = match NatType::try_from(remote_nat_byte) {
+        Ok(nat) => nat,
+        Err(_) => NatType::Invalid,
+    };
 
     let mut v6: [u8; 16] = [0; 16];
     let mut v6_port = 0;
@@ -277,6 +282,7 @@ pub async fn handle_packet_peer_info(
                     v4: v4_u32,
                     v6: [0; 16],
                 };
+                *(edgeinfo.nat_type.write().unwrap()) = remote_nat;
                 *(edgeinfo.sock.write().unwrap()) = sock.deepcopy();
                 info!(
                     "Rx PEERINFO for {}: is at {}",
@@ -683,6 +689,8 @@ async fn send_register(eee: &'static Node, sock: &SdlanSock, mac: Mac, _v6_info:
         return;
     }
 
+    let self_nat = eee.get_nat_type();
+
     let register = SdlRegister {
         network_id: network_id,
         src_mac: Vec::from(eee.device_config.get_mac()),
@@ -707,6 +715,7 @@ async fn send_register(eee: &'static Node, sock: &SdlanSock, mac: Mac, _v6_info:
         )
         .await;
     }
+    /*
     let mut target_sock_v4 = sock.deepcopy();
     tokio::spawn(async move {
         for i in 1..=10 {
@@ -720,6 +729,7 @@ async fn send_register(eee: &'static Node, sock: &SdlanSock, mac: Mac, _v6_info:
             tokio::time::sleep(Duration::from_millis(500)).await;
         }
     });
+    */
     /*
     let key = eee.get_header_key();
     if key.len() > 0 {
diff --git a/src/pb/message.rs b/src/pb/message.rs
index c4ec1f0..3c85a29 100644
--- a/src/pb/message.rs
+++ b/src/pb/message.rs
@@ -105,7 +105,9 @@ pub struct SdlSendRegisterEvent {
     pub nat_ip: u32,
     #[prost(uint32, tag = "3")]
     pub nat_port: u32,
-    #[prost(message, optional, tag = "4")]
+    #[prost(uint32, tag = "4")]
+    pub nat_type: u32,
+    #[prost(message, optional, tag = "5")]
     pub v6_info: ::core::option::Option<Sdlv6Info>,
 }
 #[allow(clippy::derive_partial_eq_without_eq)]
diff --git a/src/tcp/tcp_codec.rs b/src/tcp/tcp_codec.rs
index 355e551..e6297cc 100644
--- a/src/tcp/tcp_codec.rs
+++ b/src/tcp/tcp_codec.rs
@@ -44,6 +44,7 @@ pub enum NatType {
     PortRestricted = 3,
     ConeRestricted = 4,
     Symmetric = 5,
+    Invalid = 0xff,
 }
 
 #[derive(Debug, Copy, Clone, TryFromPrimitive)]