diff --git a/Cargo.lock b/Cargo.lock
index 9c2bdfb..e77bbcd 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1422,7 +1422,7 @@ dependencies = [
 [[package]]
 name = "sdlan-sn-rs"
 version = "0.1.0"
-source = "git+https://git.asxalex.pw/sdlan-v2/sdlan-rs.git#f320526f2dc1f6c3154b9ade81c556af0d068378"
+source = "git+ssh://git@git.asxalex.pw/sdlan-v2/sdlan-rs.git#f320526f2dc1f6c3154b9ade81c556af0d068378"
 dependencies = [
  "aes",
  "byteorder",
diff --git a/Cargo.toml b/Cargo.toml
index e9379d5..19979a2 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -13,8 +13,8 @@ once_cell = "1.19.0"
 prost = "0.12.6"
 prost-build = "0.12.6"
 rsa = "0.9.6"
-# sdlan-sn-rs = { git = "ssh://git@git.asxalex.pw/sdlan-v2/sdlan-rs.git" }
-sdlan-sn-rs = { git = "https://git.asxalex.pw/sdlan-v2/sdlan-rs.git" }
+sdlan-sn-rs = { git = "ssh://git@git.asxalex.pw/sdlan-v2/sdlan-rs.git" }
+# sdlan-sn-rs = { git = "https://git.asxalex.pw/sdlan-v2/sdlan-rs.git" }
 structopt = "0.3.26"
 tokio = { version = "1.38.0", futures = ["full"] }
 tokio-util = "0.7.11"
diff --git a/src/network/async_main.rs b/src/network/async_main.rs
index 3f8a71f..d5d0747 100644
--- a/src/network/async_main.rs
+++ b/src/network/async_main.rs
@@ -1,4 +1,4 @@
-use std::net::SocketAddr;
+use std::net::{IpAddr, SocketAddr};
 use std::sync::atomic::Ordering;
 use std::time::Duration;
 
@@ -14,8 +14,7 @@ use etherparse::IpHeaders;
 use sdlan_sn_rs::config::{AF_INET, SDLAN_DEFAULT_TTL};
 use sdlan_sn_rs::peer::SdlanSock;
 use sdlan_sn_rs::utils::{
-    self, aes_encrypt, create_or_load_uuid, get_current_timestamp, ip_to_string,
-    is_multi_broadcast, rsa_decrypt,
+    self, aes_encrypt, create_or_load_uuid, get_current_timestamp, get_sdlan_sock_from_socketaddr, ip_to_string, is_multi_broadcast, rsa_decrypt
 };
 use sdlan_sn_rs::utils::{Result, SDLanError};
 use tokio::io::AsyncWriteExt;
@@ -188,6 +187,18 @@ pub async fn async_main(
                 // let edge = get_edge();
                 // let edge = get_edge();
                 // let token = args.token.clone();
+                if let Ok(ipaddr) = stream.local_addr() {
+                    match ipaddr.ip() {
+                        IpAddr::V4(v4) => {
+                            let ip = v4.into();
+                            println!("outer ip is {} => {}", v4, ip);
+                            edge.outer_ip_v4.store(ip, Ordering::Relaxed);
+                        }
+                        _other => {
+
+                        }
+                    }
+                }
                 let register_super = SdlRegisterSuper {
                     version: 1,
                     installed_channel,
diff --git a/src/network/node.rs b/src/network/node.rs
index b2d23fc..2703da6 100644
--- a/src/network/node.rs
+++ b/src/network/node.rs
@@ -120,6 +120,7 @@ pub struct Node {
 
     // pub tcp_sock_v4: TCPSocket,
     pub udp_sock_v4: Socket,
+    pub outer_ip_v4: AtomicU32,
     pub udp_sock_v6: RwLock<Arc<Option<Socket>>>,
 
     pub multicast_sock: SdlanSock,
@@ -190,7 +191,9 @@ impl Node {
 
             // tcp_sock_v4: tcpsock,
             udp_sock_v4: sock,
+            outer_ip_v4: AtomicU32::new(0),
             udp_sock_v6: RwLock::new(Arc::new(None)),
+
             multicast_sock: SdlanSock {
                 family: AF_INET,
                 port: config::MULTICAST_PORT,
@@ -309,6 +312,11 @@ impl Node {
             return NatType::Blocked;
         };
 
+        if reply1.ip == self.outer_ip_v4.load(Ordering::Relaxed) {
+            *self.nat_type.lock().unwrap() = NatType::NoNat;
+            return NatType::NoNat;
+        }
+
         if reply1.ip != reply2.ip || reply1.port != reply2.port {
             *self.nat_type.lock().unwrap() = NatType::Symmetric;
             return NatType::Symmetric;