diff --git a/Tun/Punchnet/Actors/SDLContextActor.swift b/Tun/Punchnet/Actors/SDLContextActor.swift
index c21eb38..dea948c 100644
--- a/Tun/Punchnet/Actors/SDLContextActor.swift
+++ b/Tun/Punchnet/Actors/SDLContextActor.swift
@@ -25,6 +25,15 @@ actor SDLContextActor {
     private enum UDPHoleKind: Equatable {
         case v4
         case v6
+        
+        func convertAddressType() -> Session.AddressType {
+            switch self {
+            case .v4:
+                return .v4
+            case .v6:
+                return .v6
+            }
+        }
     }
     
     private var readyState: ReadyState = .idle
@@ -845,13 +854,13 @@ extension SDLContextActor {
             }
             await self.proberActor.handleProbeReply(localAddress: localAddress, reply: probeReply)
         case .register(let register):
-            try? await self.handleRegister(remoteAddress: remoteAddress, register: register)
+            try? await self.handleRegister(remoteAddress: remoteAddress, register: register, source: source)
         case .registerAck(let registerAck):
-            await self.handleRegisterAck(remoteAddress: remoteAddress, registerAck: registerAck)
+            await self.handleRegisterAck(remoteAddress: remoteAddress, registerAck: registerAck, source: source)
         }
     }
     
-    private func handleRegister(remoteAddress: SocketAddress, register: SDLRegister) async throws {
+    private func handleRegister(remoteAddress: SocketAddress, register: SDLRegister, source: UDPHoleKind) async throws {
         let networkAddr = config.networkAddress
         SDLLogger.log("[SDLContext] register packet: \(register), network_address: \(networkAddr)")
         
@@ -865,7 +874,7 @@ extension SDLContextActor {
             
             self.sendPeerPacket(type: .registerAck, data: try registerAck.serializedData(), remoteAddress: remoteAddress)
             // 这里需要建立到来源的会话, 在复杂网络下，通过super-node查询到的nat地址不一定靠谱，需要通过udp包的来源地址作为nat地址
-            if let session = Session(dstMac: register.srcMac, natAddress: remoteAddress) {
+            if let session = Session(dstMac: register.srcMac, natAddress: remoteAddress, addressType: source.convertAddressType()) {
                 await self.sessionManager.addSession(session: session)
             } else {
                 SDLLogger.log("[SDLContext] didReadRegister get unsupported remoteAddress: \(remoteAddress)", for: .debug)
@@ -875,11 +884,11 @@ extension SDLContextActor {
         }
     }
     
-    private func handleRegisterAck(remoteAddress: SocketAddress, registerAck: SDLRegisterAck) async {
+    private func handleRegisterAck(remoteAddress: SocketAddress, registerAck: SDLRegisterAck, source: UDPHoleKind) async {
         // 判断目标地址是否是tun的网卡地址, 并且是在同一个网络下
         let networkAddr = config.networkAddress
         if registerAck.dstMac == networkAddr.mac && registerAck.networkID == networkAddr.networkId {
-            if let session = Session(dstMac: registerAck.srcMac, natAddress: remoteAddress) {
+            if let session = Session(dstMac: registerAck.srcMac, natAddress: remoteAddress, addressType: source.convertAddressType()) {
                 await self.sessionManager.addSession(session: session)
             } else {
                 SDLLogger.log("[SDLContext] didReadRegisterAck get unsupported remoteAddress: \(remoteAddress)", for: .debug)
diff --git a/Tun/Punchnet/Actors/SDLLayerPacketForwarder.swift b/Tun/Punchnet/Actors/SDLLayerPacketForwarder.swift
index ddf0a4e..649f349 100644
--- a/Tun/Punchnet/Actors/SDLLayerPacketForwarder.swift
+++ b/Tun/Punchnet/Actors/SDLLayerPacketForwarder.swift
@@ -8,6 +8,7 @@
 import Foundation
 
 struct SDLLayerPacketForwarder {
+    
     enum DeliveryPlan {
         case superNode(payload: Data)
         case peer(payload: Data, session: Session)
@@ -28,8 +29,7 @@ struct SDLLayerPacketForwarder {
             return .superNode(payload: payload)
         }
         
-        let preferredSessionType = Session.AddressType(packetType: type)
-        if let session = await self.sessionManager.getSession(toAddress: dstMac, preferredType: preferredSessionType) {
+        if let session = await self.sessionManager.getSession(toAddress: dstMac) {
             return .peer(payload: payload, session: session)
         }
         
diff --git a/Tun/Punchnet/SessionManager.swift b/Tun/Punchnet/SessionManager.swift
index 613d850..e6e84d3 100644
--- a/Tun/Punchnet/SessionManager.swift
+++ b/Tun/Punchnet/SessionManager.swift
@@ -8,32 +8,10 @@ import Foundation
 import NIOCore
 import Darwin
 
-struct Session: @unchecked Sendable {
+struct Session {
     enum AddressType: String, Hashable {
         case v4
         case v6
-        
-        init?(socketAddress: SocketAddress) {
-            switch socketAddress {
-            case .v4:
-                self = .v4
-            case .v6:
-                self = .v6
-            default:
-                return nil
-            }
-        }
-        
-        init?(packetType: LayerPacket.PacketType) {
-            switch packetType {
-            case .arp, .ipv4:
-                self = .v4
-            case .ipv6:
-                self = .v6
-            default:
-                return nil
-            }
-        }
     }
     
     // 在内部的通讯的ip地址, 整数格式
@@ -46,11 +24,7 @@ struct Session: @unchecked Sendable {
     // 最后使用时间
     var lastTimestamp: Int32
     
-    init?(dstMac: Data, natAddress: SocketAddress) {
-        guard let addressType = AddressType(socketAddress: natAddress) else {
-            return nil
-        }
-        
+    init?(dstMac: Data, natAddress: SocketAddress, addressType: AddressType) {
         self.dstMac = dstMac
         self.natAddress = natAddress
         self.addressType = addressType
@@ -68,7 +42,7 @@ actor SessionManager {
     // session的有效时间
     private let ttl: Int32 = 10
     
-    func getSession(toAddress: Data, preferredType: Session.AddressType? = nil) -> Session? {
+    func getSession(toAddress: Data) -> Session? {
         let timestamp = Int32(Date().timeIntervalSince1970)
         
         guard var sessions = self.sessions[toAddress] else {
@@ -81,7 +55,7 @@ actor SessionManager {
             return nil
         }
         
-        guard var session = self.selectSession(in: sessions, preferredType: preferredType) else {
+        guard var session = self.selectSession(in: sessions) else {
             self.sessions[toAddress] = sessions
             return nil
         }
@@ -109,13 +83,7 @@ actor SessionManager {
         self.sessions.removeValue(forKey: dstMac)
     }
     
-    private func selectSession(in sessions: [Session.AddressType: Session], preferredType: Session.AddressType?) -> Session? {
-        if let preferredType {
-            if let preferred = sessions[preferredType] {
-                return preferred
-            }
-        }
-        
+    private func selectSession(in sessions: [Session.AddressType: Session]) -> Session? {
         return sessions.values.max(by: { $0.lastTimestamp < $1.lastTimestamp })
     }