diff --git a/src/communication/nlsr_slh.hpp b/src/communication/nlsr_slh.hpp
new file mode 100644
index 0000000..3fef612
--- /dev/null
+++ b/src/communication/nlsr_slh.hpp
@@ -0,0 +1,65 @@
+#ifndef NLSR_SLH_HPP
+#define NLSR_SLH_HPP
+
+#include <iostream>
+
+#include <ndn-cpp-dev/face.hpp>
+#include <nsync/sync-socket.h>
+#include <ndn-cpp-dev/security/validator-null.hpp>
+#include <ndn-cpp-dev/util/scheduler.hpp>
+
+#include "nlsr_sm.hpp"
+
+class KeyManager;
+
+extern "C" {
+#include <unistd.h>
+}
+
+using namespace ndn;
+using namespace Sync;
+using namespace std;
+
+class interestManager;
+class ConfParameter;
+
+namespace nlsr
+{
+    class SyncLogicHandler
+    {
+    public:
+        SyncLogicHandler(ndn::shared_ptr<boost::asio::io_service> ioService)
+            : validator(new ndn::ValidatorNull())
+            , syncFace(new ndn::Face(ioService))
+        {}
+
+
+        void createSyncSocket(Nlsr& pnlsr);
+        void nsyncUpdateCallBack(const vector<MissingDataInfo> &v,
+                                 SyncSocket *socket, Nlsr& pnlsr );
+        void nsyncRemoveCallBack(const string& prefix, Nlsr &pnlsr);
+        void removeRouterFromSyncing(string& routerPrefix);
+        void publishRoutingUpdate(SequencingManager& sm, string updatePrefix);
+        void publishKeyUpdate(KeyManager& km);
+        void publishIdentityUpdate(string identityName);
+        void setSyncPrefix(string sp)
+        {
+            syncPrefix.clear();
+            syncPrefix.set(sp);
+        }
+    private:
+        void processUpdateFromSync(std::string updateName, uint64_t seqNo,
+                                   Nlsr& pnlsr);
+        void processRoutingUpdateFromSync(std::string routerName, uint64_t seqNo,
+                                          Nlsr& pnlsr);
+        void processKeysUpdateFromSync(std::string certName, uint64_t seqNo,
+                                       Nlsr& pnlsr);
+        void publishSyncUpdate(string updatePrefix, uint64_t seqNo);
+    private:
+        ndn::shared_ptr<ndn::ValidatorNull> validator;
+        ndn::shared_ptr<ndn::Face> syncFace;
+        ndn::shared_ptr<SyncSocket> syncSocket;
+        ndn::Name syncPrefix;
+    };
+}
+#endif