diff --git a/Tun/Punchnet/SDLIPV6AssistClient.swift b/Tun/Punchnet/SDLIPV6AssistClient.swift
index ddc8f3f..1d50cf5 100644
--- a/Tun/Punchnet/SDLIPV6AssistClient.swift
+++ b/Tun/Punchnet/SDLIPV6AssistClient.swift
@@ -9,9 +9,14 @@ import Network
 
 enum SDLIPV6AssistError: Error {
     case lostConnection
+    case requestTimeout
 }
 
 actor SDLIPV6AssistClient {
+    private struct PendingRequest {
+        let continuation: CheckedContinuation<SDLV6AssistProbeReply, Error>
+        let timeoutTask: Task<Void, Never>
+    }
     
     private enum State {
         case idle
@@ -25,8 +30,8 @@ actor SDLIPV6AssistClient {
     private let assistServerAddress: NWEndpoint
     
     private var packetId: UInt32 = 1
-    private var pendingRequests: [UInt32: CheckedContinuation<SDLV6AssistProbeReply, Error>] = [:]
-    
+    private var pendingRequests: [UInt32: PendingRequest] = [:]
+
     // 用来处理关闭事件
     private let closeStream: AsyncStream<Void>
     private let closeContinuation: AsyncStream<Void>.Continuation
@@ -104,40 +109,52 @@ actor SDLIPV6AssistClient {
         }
     }
     
-    func probe() async throws -> SDLV6AssistProbeReply {
+    func probe(requestTimeout: Duration = .seconds(5)) async throws -> SDLV6AssistProbeReply {
         guard case .running = self.state, let connection = self.connection, connection.state == .ready else {
             throw SDLIPV6AssistError.lostConnection
         }
         
+        let pktId = self.nextPacketId()
+        let requestTimeout = self.requestTimeout
+        var assistProbe = SDLV6AssistProbe()
+        assistProbe.pktID = pktId
+        let data = try assistProbe.serializedData()
+        
         return try await withCheckedThrowingContinuation { cont in
-            let pktId = self.nextPacketId()
-            var assistProbe = SDLV6AssistProbe()
-            assistProbe.pktID = pktId
-            
-            do {
-                let data = try assistProbe.serializedData()
-                connection.send(content: data, completion: .contentProcessed { error in
-                    if let error {
-                        Task {
-                            await self.handleProcesseError(packetId: pktId, error: error)
-                        }
-                    }
-                })
-                self.pendingRequests[pktId] = cont
-            } catch let err {
-                cont.resume(throwing: err)
+            let timeoutTask = Task { [weak self] in
+                try? await Task.sleep(for: requestTimeout)
+                await self?.handleRequestTimeout(packetId: pktId)
             }
+            
+            self.pendingRequests[pktId] = .init(continuation: cont, timeoutTask: timeoutTask)
+            connection.send(content: data, completion: .contentProcessed { error in
+                if let error {
+                    Task {
+                        await self.handleProcessError(packetId: pktId, error: error)
+                    }
+                }
+            })
         }
         
     }
     
-    private func handleProcesseError(packetId: UInt32, error: NWError) {
-        if let cont = self.pendingRequests.removeValue(forKey: packetId) {
-            cont.resume(throwing: error)
+    private func handleProcessError(packetId: UInt32, error: NWError) {
+        if let request = self.takePendingRequest(packetId: packetId) {
+            request.continuation.resume(throwing: error)
+        }
+    }
+    
+    private func handleRequestTimeout(packetId: UInt32) {
+        if let request = self.takePendingRequest(packetId: packetId) {
+            request.continuation.resume(throwing: SDLIPV6AssistError.requestTimeout)
         }
     }
     
     func stop() {
+        self.stop(pendingError: SDLIPV6AssistError.lostConnection)
+    }
+    
+    private func stop(pendingError: any Error) {
         guard self.state != .stopped else {
             return
         }
@@ -147,6 +164,7 @@ actor SDLIPV6AssistClient {
         self.receiveTask = nil
         self.connection?.cancel()
         self.connection = nil
+        self.failAllPendingRequests(error: pendingError)
         self.finishCloseStreamIfNeeded()
     }
     
@@ -161,7 +179,7 @@ actor SDLIPV6AssistClient {
             self.startReceiveTask(for: connection)
         case .failed(let error):
             SDLLogger.log("[SDLIPV6AssistClient] Connection failed: \(error)", for: .debug)
-            self.stop()
+            self.stop(pendingError: error)
         case .cancelled:
             self.stop()
         default:
@@ -191,8 +209,8 @@ actor SDLIPV6AssistClient {
         do {
             let packet = try SDLV6AssistProbeReply(serializedBytes: data)
             let pktId = packet.pktID
-            if let cont = self.pendingRequests.removeValue(forKey: pktId) {
-                cont.resume(returning: packet)
+            if let request = self.takePendingRequest(packetId: pktId) {
+                request.continuation.resume(returning: packet)
             }
         } catch {
             SDLLogger.log("[SDLIPV6AssistClient] Receive error: \(error)", for: .debug)
@@ -227,6 +245,25 @@ actor SDLIPV6AssistClient {
         return packetId
     }
     
+    private func takePendingRequest(packetId: UInt32) -> PendingRequest? {
+        guard let request = self.pendingRequests.removeValue(forKey: packetId) else {
+            return nil
+        }
+        
+        request.timeoutTask.cancel()
+        return request
+    }
+    
+    private func failAllPendingRequests(error: any Error) {
+        let pendingRequests = self.pendingRequests
+        self.pendingRequests.removeAll()
+        
+        pendingRequests.values.forEach { request in
+            request.timeoutTask.cancel()
+            request.continuation.resume(throwing: error)
+        }
+    }
+    
     deinit {
         self.connection?.cancel()
     }