diff --git a/common.cpp b/common.cpp
index 52156bb..46a4d08 100644
--- a/common.cpp
+++ b/common.cpp
@@ -833,21 +833,6 @@ int create_new_udp(int &new_udp_fd,int remote_address_uint32,int remote_port)
 	}
 	return 0;
 }*/
-void ip_port_t::from_u64(u64_t u64)
-{
-	ip=get_u64_h(u64);
-	port=get_u64_l(u64);
-}
-u64_t ip_port_t::to_u64()
-{
-	return pack_u64(ip,port);
-}
-char * ip_port_t::to_s()
-{
-	static char res[40];
-	sprintf(res,"%s:%d",my_ntoa(ip),port);
-	return res;
-}
 
 int round_up_div(int a,int b)
 {
diff --git a/common.h b/common.h
index 64a2f82..3d03384 100644
--- a/common.h
+++ b/common.h
@@ -224,10 +224,11 @@ struct address_t  //TODO scope id
 	};
 	storage_t inner;
 
-	address_t()
+	/*address_t()
 	{
 		clear();
-	}
+	}*/
+
 	void clear()
 	{
 		memset(&inner,0,sizeof(inner));
@@ -440,4 +441,110 @@ int new_connected_socket(int &fd,u32_t ip,int port);
 int new_listen_socket2(int &fd,address_t &addr);
 int new_connected_socket2(int &fd,address_t &addr);
 
+struct not_copy_able_t
+{
+	not_copy_able_t()
+	{
+
+	}
+	not_copy_able_t(const not_copy_able_t &other)
+	{
+		assert(0==1);
+	}
+	const not_copy_able_t & operator=(const not_copy_able_t &other)
+	{
+		assert(0==1);
+		return other;
+	}
+};
+
+
+template <class key_t>
+struct lru_collector_t:not_copy_able_t
+{
+	//typedef void* key_t;
+//#define key_t void*
+	struct lru_pair_t
+	{
+		key_t key;
+		my_time_t ts;
+	};
+
+	unordered_map<key_t,typename list<lru_pair_t>::iterator> mp;
+
+	list<lru_pair_t> q;
+	int update(key_t key)
+	{
+		assert(mp.find(key)!=mp.end());
+		auto it=mp[key];
+		q.erase(it);
+
+		my_time_t value=get_current_time();
+		if(!q.empty())
+		{
+			assert(value >=q.front().ts);
+		}
+		lru_pair_t tmp; tmp.key=key; tmp.ts=value;
+		q.push_front( tmp);
+		mp[key]=q.begin();
+
+		return 0;
+	}
+	int new_key(key_t key)
+	{
+		assert(mp.find(key)==mp.end());
+
+		my_time_t value=get_current_time();
+		if(!q.empty())
+		{
+			assert(value >=q.front().ts);
+		}
+		lru_pair_t tmp; tmp.key=key; tmp.ts=value;
+		q.push_front( tmp);
+		mp[key]=q.begin();
+
+		return 0;
+	}
+	int size()
+	{
+		return q.size();
+	}
+	int empty()
+	{
+		return q.empty();
+	}
+	void clear()
+	{
+		mp.clear(); q.clear();
+	}
+	my_time_t ts_of(key_t key)
+	{
+		assert(mp.find(key)!=mp.end());
+		return mp[key]->ts;
+	}
+
+	my_time_t peek_back(key_t &key)
+	{
+		assert(!q.empty());
+		auto it=q.end(); it--;
+		key=it->key;
+		return it->ts;
+	}
+	void erase(key_t key)
+	{
+		assert(mp.find(key)!=mp.end());
+		q.erase(mp[key]);
+		mp.erase(key);
+	}
+	/*
+	void erase_back()
+	{
+		assert(!q.empty());
+		auto it=q.end(); it--;
+		key_t key=it->key;
+		erase(key);
+	}*/
+};
+
+
 #endif /* COMMON_H_ */
diff --git a/connection.cpp b/connection.cpp
index bbbab16..8ad4b9a 100644
--- a/connection.cpp
+++ b/connection.cpp
@@ -7,7 +7,7 @@
 
 #include "connection.h"
 
-const int disable_conv_clear=0;//a udp connection in the multiplexer is called conversation in this program,conv for short.
+//const int disable_conv_clear=0;//a udp connection in the multiplexer is called conversation in this program,conv for short.
 
 const int disable_conn_clear=0;//a raw connection is called conn.
 
@@ -20,230 +20,76 @@ void server_clear_function(u64_t u64)//used in conv_manager in server mode.for s
 	assert(fd_manager.exist(fd64));
 	ev_io &watcher= fd_manager.get_info(fd64).io_watcher;
 
-	ip_port_t &ip_port=fd_manager.get_info(fd64).ip_port;//
-	assert(conn_manager.exist(ip_port));//
-	ev_loop *loop =conn_manager.find(ip_port).loop;  // overkill ? should we just use ev_default_loop(0)?
+	address_t &addr=fd_manager.get_info(fd64).addr;//
+	assert(conn_manager.exist(addr));//
+	ev_loop *loop =conn_manager.find_insert(addr).loop;  // overkill ? should we just use ev_default_loop(0)?
 
 	ev_io_stop(loop,&watcher);
 
 	fd_manager.fd64_close(fd64);
 
-
-}
-
-////////////////////////////////////////////////////////////////////
-
-conv_manager_t::conv_manager_t()
-{
-	clear_it=conv_last_active_time.begin();
-	long long last_clear_time=0;
-	reserve();
-}
-conv_manager_t::~conv_manager_t()
-{
-	clear();
-}
-int conv_manager_t::get_size()
-{
-	return conv_to_u64.size();
-}
-void conv_manager_t::reserve()
-{
-	u64_to_conv.reserve(10007);
-	conv_to_u64.reserve(10007);
-	conv_last_active_time.reserve(10007);
-}
-void conv_manager_t::clear()
-{
-	//if(disable_conv_clear) return ;//////what was the purpose of this code?
-
-	if(client_or_server==server_mode)
-	{
-		for(auto it=conv_to_u64.begin();it!=conv_to_u64.end();it++)
-		{
-			//int fd=int((it->second<<32u)>>32u);
-			server_clear_function(  it->second);
-		}
-	}
-	u64_to_conv.clear();
-	conv_to_u64.clear();
-	conv_last_active_time.clear();
-
-	clear_it=conv_last_active_time.begin();
-
-}
-u32_t conv_manager_t::get_new_conv()
-{
-	u32_t conv=get_fake_random_number_nz();
-	while(conv_to_u64.find(conv)!=conv_to_u64.end())
-	{
-		conv=get_fake_random_number_nz();
-	}
-	return conv;
-}
-int conv_manager_t::is_conv_used(u32_t conv)
-{
-	return conv_to_u64.find(conv)!=conv_to_u64.end();
-}
-int conv_manager_t::is_u64_used(u64_t u64)
-{
-	return u64_to_conv.find(u64)!=u64_to_conv.end();
-}
-u32_t conv_manager_t::find_conv_by_u64(u64_t u64)
-{
-	assert(is_u64_used(u64));
-	return u64_to_conv[u64];
-}
-u64_t conv_manager_t::find_u64_by_conv(u32_t conv)
-{
-	assert(is_conv_used(conv));
-	return conv_to_u64[conv];
-}
-int conv_manager_t::update_active_time(u32_t conv)
-{
-	assert(is_conv_used(conv));
-	return conv_last_active_time[conv]=get_current_time();
-}
-int conv_manager_t::insert_conv(u32_t conv,u64_t u64)//////todo add capacity ///done at upper level
-{
-	assert(!is_conv_used(conv));
-	int bucket_size_before=conv_last_active_time.bucket_count();
-	u64_to_conv[u64]=conv;
-	conv_to_u64[conv]=u64;
-	conv_last_active_time[conv]=get_current_time();
-	int bucket_size_after=conv_last_active_time.bucket_count();
-	if(bucket_size_after!=bucket_size_before)
-		clear_it=conv_last_active_time.begin();
-	return 0;
-}
-int conv_manager_t::erase_conv(u32_t conv)
-{
-	//if(disable_conv_clear) return 0;
-	assert(conv_last_active_time.find(conv)!=conv_last_active_time.end());
-	u64_t u64=conv_to_u64[conv];
-	if(client_or_server==server_mode)
-	{
-		server_clear_function(u64);
-	}
-	assert(conv_to_u64.find(conv)!=conv_to_u64.end());
-	conv_to_u64.erase(conv);
-	u64_to_conv.erase(u64);
-	conv_last_active_time.erase(conv);
-	return 0;
-}
-int conv_manager_t::clear_inactive(char * ip_port)
-{
-	if(get_current_time()-last_clear_time>conv_clear_interval)
-	{
-		last_clear_time=get_current_time();
-		return clear_inactive0(ip_port);
-	}
-	return 0;
-}
-int conv_manager_t::clear_inactive0(char * ip_port)
-{
-	if(disable_conv_clear) return 0;
-
-	//map<uint32_t,uint64_t>::iterator it;
-	int cnt=0;
-	auto it=clear_it;
-	int size=conv_last_active_time.size();
-	int num_to_clean=size/conv_clear_ratio+conv_clear_min;   //clear 1/10 each time,to avoid latency glitch
-
-	num_to_clean=min(num_to_clean,size);
-
-	u64_t current_time=get_current_time();
-	for(;;)
-	{
-		if(cnt>=num_to_clean) break;
-		if(conv_last_active_time.begin()==conv_last_active_time.end()) break;
-
-		if(it==conv_last_active_time.end())
-		{
-			it=conv_last_active_time.begin();
-		}
-
-		if( current_time -it->second  >conv_timeout )
-		{
-			//mylog(log_info,"inactive conv %u cleared \n",it->first);
-			//auto old_it=it;
-			//it++;
-			u32_t conv= it->first;
-			it++;
-			erase_conv(conv);
-			if(ip_port==0)
-			{
-				mylog(log_info,"conv %x cleared\n",conv);
-			}
-			else
-			{
-				mylog(log_info,"[%s]conv %x cleared\n",ip_port,conv);
-			}
-		}
-		else
-		{
-			it++;
-		}
-		cnt++;
-	}
-	clear_it=it;
-	return 0;
 }
 
 
 ////////////////////////////////////////////////////////////////////
 
-
 conn_manager_t::conn_manager_t()
 {
-	//ready_num=0;
-	mp.reserve(10007);
-	//fd64_mp.reserve(100007);
-	clear_it=mp.begin();
-	last_clear_time=0;
+	 mp.reserve(10007);
+	 last_clear_time=0;
 }
-int conn_manager_t::exist(ip_port_t ip_port)
+int conn_manager_t::exist(address_t addr)
 {
-	u64_t u64=ip_port.to_u64();
-	if(mp.find(u64)!=mp.end())
-	{
-	 return 1;
-	}
+
+	 if(mp.find(addr)!=mp.end())
+	 {
+		 return 1;
+	 }
+	 return 0;
+}
+
+conn_info_t *& conn_manager_t::find_insert_p(address_t addr)  //be aware,the adress may change after rehash
+{
+// u64_t u64=0;
+ //u64=ip;
+ //u64<<=32u;
+ //u64|=port;
+ unordered_map<address_t,conn_info_t*>::iterator it=mp.find(addr);
+	 if(it==mp.end())
+	 {
+		 mp[addr]=new conn_info_t;
+		 //lru.new_key(addr);
+	 }
+	 else
+	 {
+		 //lru.update(addr);
+	 }
+	 return mp[addr];
+}
+conn_info_t & conn_manager_t::find_insert(address_t addr)  //be aware,the adress may change after rehash
+{
+ //u64_t u64=0;
+ //u64=ip;
+ //u64<<=32u;
+ //u64|=port;
+ unordered_map<address_t,conn_info_t*>::iterator it=mp.find(addr);
+	 if(it==mp.end())
+	 {
+		 mp[addr]=new conn_info_t;
+		 //lru.new_key(addr);
+	 }
+	 else
+	 {
+		 //lru.update(addr);
+	 }
+	 return *mp[addr];
+}
+int conn_manager_t::erase(unordered_map<address_t,conn_info_t*>::iterator erase_it)
+{
+	delete(erase_it->second);
+	mp.erase(erase_it->first);
 	return 0;
 }
- conn_info_t *& conn_manager_t::find_p(ip_port_t ip_port) //todo capacity   ///done at upper level
- //be aware,the adress may change after rehash
- {
-	 assert(exist(ip_port));
-	 u64_t u64=ip_port.to_u64();
-	 return mp[u64];
- }
- conn_info_t & conn_manager_t::find(ip_port_t ip_port)  //be aware,the adress may change after rehash
- {
-	 assert(exist(ip_port));
-	 u64_t u64=ip_port.to_u64();
-	 return *mp[u64];
- }
- int conn_manager_t::insert(ip_port_t ip_port)
- {
-	assert(!exist(ip_port));
-	int bucket_size_before=mp.bucket_count();
-	mp[ip_port.to_u64()]=new conn_info_t;
-	int bucket_size_after=mp.bucket_count();
-	if(bucket_size_after!=bucket_size_before)
-		clear_it=mp.begin();
-	return 0;
- }
- int conn_manager_t::erase(unordered_map<u64_t,conn_info_t*>::iterator erase_it)
- {
-	 ////////todo  close and erase timer_fd ,check fd64 empty   ///dont need
-
-		delete(erase_it->second);
-		mp.erase(erase_it->first);
-
-
-		return 0;
- }
 int conn_manager_t::clear_inactive()
 {
 	if(get_current_time()-last_clear_time>conn_clear_interval)
@@ -253,11 +99,12 @@ int conn_manager_t::clear_inactive()
 	}
 	return 0;
 }
+
 int conn_manager_t::clear_inactive0()
 {
 //mylog(log_info,"called\n");
-	 unordered_map<u64_t,conn_info_t*>::iterator it;
-	 unordered_map<u64_t,conn_info_t*>::iterator old_it;
+	 unordered_map<address_t,conn_info_t*>::iterator it;
+	 unordered_map<address_t,conn_info_t*>::iterator old_it;
 
 	if(disable_conn_clear) return 0;
 
@@ -282,7 +129,7 @@ int conn_manager_t::clear_inactive0()
 			it=mp.begin();
 		}
 
-		if(it->second->conv_manager.get_size() >0)
+		if(it->second->conv_manager.s.get_size() >0)
 		{
 			//mylog(log_info,"[%s:%d]size %d \n",my_ntoa(get_u64_h(it->first)),get_u64_l(it->first),(int)it->second->conv_manager.get_size());
 			it++;
@@ -293,7 +140,8 @@ int conn_manager_t::clear_inactive0()
 		}
 		else
 		{
-			mylog(log_info,"[%s:%d]inactive conn cleared \n",my_ntoa(get_u64_h(it->first)),get_u64_l(it->first));
+			address_t tmp_addr=it->first;// avoid making get_str() const;
+			mylog(log_info,"{%s} inactive conn cleared \n",tmp_addr.get_str());
 			old_it=it;
 			it++;
 			erase(old_it);
@@ -303,4 +151,3 @@ int conn_manager_t::clear_inactive0()
 	clear_it=it;
 	return 0;
 }
-
diff --git a/connection.h b/connection.h
index 7ce6ed0..421b119 100644
--- a/connection.h
+++ b/connection.h
@@ -19,39 +19,189 @@ extern int disable_anti_replay;
 
 extern int report_interval;
 
+const int disable_conv_clear=0;
+
+template  <class T>
 struct conv_manager_t  // manage the udp connections
 {
 	//typedef hash_map map;
-	unordered_map<u64_t,u32_t> u64_to_conv;  //conv and u64 are both supposed to be uniq
-	unordered_map<u32_t,u64_t> conv_to_u64;
-	unordered_map<u32_t,u64_t> conv_last_active_time;
+	unordered_map<T,u32_t> data_to_conv;  //conv and u64 are both supposed to be uniq
+	unordered_map<u32_t,T> conv_to_data;
 
-	unordered_map<u32_t,u64_t>::iterator clear_it;
+	lru_collector_t<u32_t> lru;
+	//unordered_map<u32_t,u64_t> conv_last_active_time;
 
-	//void (*clear_function)(uint64_t u64) ;
+	//unordered_map<u32_t,u64_t>::iterator clear_it;
+
+	void (*additional_clear_function)(T data) =0;
 
 	long long last_clear_time;
 
+	conv_manager_t()
+		{
+			//clear_it=conv_last_active_time.begin();
+			long long last_clear_time=0;
+			additional_clear_function=0;
+		}
+	~conv_manager_t()
+		{
+			clear();
+		}
+		int get_size()
+		{
+			return conv_to_data.size();
+		}
+		void reserve()
+		{
+			data_to_conv.reserve(10007);
+			conv_to_data.reserve(10007);
+			//conv_last_active_time.reserve(10007);
+
+			lru.mp.reserve(10007);
+		}
+		void clear()
+		{
+			if(disable_conv_clear) return ;
+
+			if(additional_clear_function!=0)
+			{
+				for(auto it=conv_to_data.begin();it!=conv_to_data.end();it++)
+				{
+					//int fd=int((it->second<<32u)>>32u);
+					additional_clear_function(  it->second);
+				}
+			}
+			data_to_conv.clear();
+			conv_to_data.clear();
+
+			lru.clear();
+			//conv_last_active_time.clear();
+
+			//clear_it=conv_last_active_time.begin();
+
+		}
+		u32_t get_new_conv()
+		{
+			u32_t conv=get_fake_random_number_nz();
+			while(conv_to_data.find(conv)!=conv_to_data.end())
+			{
+				conv=get_fake_random_number_nz();
+			}
+			return conv;
+		}
+		int is_conv_used(u32_t conv)
+		{
+			return conv_to_data.find(conv)!=conv_to_data.end();
+		}
+		int is_data_used(T data)
+		{
+			return data_to_conv.find(data)!=data_to_conv.end();
+		}
+		u32_t find_conv_by_data(T data)
+		{
+			return data_to_conv[data];
+		}
+		T find_data_by_conv(u32_t conv)
+		{
+			return conv_to_data[conv];
+		}
+		int update_active_time(u32_t conv)
+		{
+			//return conv_last_active_time[conv]=get_current_time();
+			lru.update(conv);
+			return 0;
+		}
+		int insert_conv(u32_t conv,T data)
+		{
+			data_to_conv[data]=conv;
+			conv_to_data[conv]=data;
+			//conv_last_active_time[conv]=get_current_time();
+			lru.new_key(conv);
+			return 0;
+		}
+		int erase_conv(u32_t conv)
+		{
+			if(disable_conv_clear) return 0;
+			T data=conv_to_data[conv];
+			if(additional_clear_function!=0)
+			{
+				additional_clear_function(data);
+			}
+			conv_to_data.erase(conv);
+			data_to_conv.erase(data);
+			//conv_last_active_time.erase(conv);
+			lru.erase(conv);
+			return 0;
+		}
+		int clear_inactive(char * info=0)
+		{
+			if(get_current_time()-last_clear_time>conv_clear_interval)
+			{
+				last_clear_time=get_current_time();
+				return clear_inactive0(info);
+			}
+			return 0;
+		}
+		int clear_inactive0(char * info)
+		{
+			if(disable_conv_clear) return 0;
+
+
+			unordered_map<u32_t,u64_t>::iterator it;
+			unordered_map<u32_t,u64_t>::iterator old_it;
+
+			//map<uint32_t,uint64_t>::iterator it;
+			int cnt=0;
+			//it=clear_it;
+			int size=lru.size();
+			int num_to_clean=size/conv_clear_ratio+conv_clear_min;   //clear 1/10 each time,to avoid latency glitch
+
+			num_to_clean=min(num_to_clean,size);
+
+			my_time_t current_time=get_current_time();
+			for(;;)
+			{
+				if(cnt>=num_to_clean) break;
+				if(lru.empty()) break;
+
+				u32_t conv;
+				my_time_t ts=lru.peek_back(conv);
+
+				if(current_time- ts < conv_timeout) break;
+
+				erase_conv(conv);
+				if(info==0)
+				{
+					mylog(log_info,"conv %x cleared\n",conv);
+				}
+				else
+				{
+					mylog(log_info,"[%s]conv %x cleared\n",info,conv);
+				}
+				cnt++;
+			}
+			return 0;
+		}
+
+
+		/*
 	conv_manager_t();
-	conv_manager_t(const conv_manager_t &b)
-	{
-		assert(0==1);
-	}
 	~conv_manager_t();
 	int get_size();
 	void reserve();
 	void clear();
 	u32_t get_new_conv();
 	int is_conv_used(u32_t conv);
-	int is_u64_used(u64_t u64);
-	u32_t find_conv_by_u64(u64_t u64);
-	u64_t find_u64_by_conv(u32_t conv);
+	int is_u64_used(T u64);
+	u32_t find_conv_by_u64(T u64);
+	T find_u64_by_conv(u32_t conv);
 	int update_active_time(u32_t conv);
-	int insert_conv(u32_t conv,u64_t u64);
+	int insert_conv(u32_t conv,T u64);
 	int erase_conv(u32_t conv);
 	int clear_inactive(char * ip_port=0);
-	int clear_inactive0(char * ip_port);
-};
+	int clear_inactive0(char * ip_port);*/
+};//g_conv_manager;
+
 
 
 struct inner_stat_t
@@ -83,7 +233,7 @@ struct stat_t
 					);
 		}
 	}
-	void report_as_server(ip_port_t &ip_port)
+	void report_as_server(address_t &addr)
 	{
 		if(report_interval!=0 &&get_current_time()-last_report_time>u64_t(report_interval)*1000)
 		{
@@ -91,7 +241,7 @@ struct stat_t
 			inner_stat_t &a=fec_to_normal;
 			inner_stat_t &b=normal_to_fec;
 			mylog(log_info,"[report][%s]client-->server:(original:%llu pkt;%llu byte) (fec:%llu pkt;%llu byte)  server-->client:(original:%llu pkt;%llu byte) (fec:%llu pkt;%llu byte)\n",
-					ip_port.to_s(),
+					addr.get_str(),
 					a.output_packet_num,a.output_packet_size,a.input_packet_num,a.input_packet_size,
 					b.input_packet_num,b.input_packet_size,b.output_packet_num,b.output_packet_size
 					);
@@ -103,7 +253,14 @@ struct stat_t
 struct conn_info_t     //stores info for a raw connection.for client ,there is only one connection,for server there can be thousand of connection since server can
 //handle multiple clients
 {
-	conv_manager_t conv_manager;
+	struct  //conv_manager_t is here to avoid copying when a connection is recovered
+	//TODO maybe an unconstrained union is better, but struct is okay since conv_manger is small when no data is filled in.
+	{
+		conv_manager_t<address_t> c;
+		conv_manager_t<u64_t> s;
+		//avoid templates here and there, avoid pointer and type cast
+	}conv_manager;
+
 	fec_encode_manager_t fec_encode_manager;
 	fec_decode_manager_t fec_decode_manager;
 	ev_timer timer;
@@ -139,7 +296,7 @@ struct conn_info_t     //stores info for a raw connection.for client ,there is o
 		assert(0==1);
 	}
 };
-
+/*
 struct conn_manager_t  //manager for connections. for client,we dont need conn_manager since there is only one connection.for server we use one conn_manager for all connections
 {
 
@@ -161,8 +318,30 @@ struct conn_manager_t  //manager for connections. for client,we dont need conn_m
 	int clear_inactive();
 	int clear_inactive0();
 
+};*/
+
+struct conn_manager_t  //manager for connections. for client,we dont need conn_manager since there is only one connection.for server we use one conn_manager for all connections
+{
+
+
+ unordered_map<address_t,conn_info_t*> mp; //put it at end so that it de-consturcts first
+ unordered_map<address_t,conn_info_t*>::iterator clear_it;
+
+ long long last_clear_time;
+
+ conn_manager_t();
+ int exist(address_t addr);
+ conn_info_t *& find_insert_p(address_t addr);  //be aware,the adress may change after rehash //not true?
+ conn_info_t & find_insert(address_t addr) ; //be aware,the adress may change after rehash
+
+ int erase(unordered_map<address_t,conn_info_t*>::iterator erase_it);
+int clear_inactive();
+int clear_inactive0();
+
 };
 
+void server_clear_function(u64_t u64);
+
 extern conn_manager_t conn_manager;
 
 
diff --git a/tunnel_client.cpp b/tunnel_client.cpp
index c1070bd..eb21d04 100644
--- a/tunnel_client.cpp
+++ b/tunnel_client.cpp
@@ -60,25 +60,25 @@ void data_from_local_or_fec_timeout(conn_info_t & conn_info,int is_time_out)
 
 		mylog(log_trace,"Received packet from %s, len: %d\n", addr.get_str(),data_len);
 
-		u64_t u64=ip_port.to_u64();
+		//u64_t u64=ip_port.to_u64();
 
-		if(!conn_info.conv_manager.is_u64_used(u64))
+		if(!conn_info.conv_manager.c.is_data_used(addr))
 		{
-			if(conn_info.conv_manager.get_size() >=max_conv_num)
+			if(conn_info.conv_manager.c.get_size() >=max_conv_num)
 			{
 				mylog(log_warn,"ignored new udp connect bc max_conv_num exceed\n");
 				return;
 			}
-			conv=conn_info.conv_manager.get_new_conv();
-			conn_info.conv_manager.insert_conv(conv,u64);
+			conv=conn_info.conv_manager.c.get_new_conv();
+			conn_info.conv_manager.c.insert_conv(conv,addr);
 			mylog(log_info,"new packet from %s,conv_id=%x\n",addr.get_str(),conv);
 		}
 		else
 		{
-			conv=conn_info.conv_manager.find_conv_by_u64(u64);
+			conv=conn_info.conv_manager.c.find_conv_by_data(addr);
 			mylog(log_trace,"conv=%d\n",conv);
 		}
-		conn_info.conv_manager.update_active_time(conv);
+		conn_info.conv_manager.c.update_active_time(conv);
 		char * new_data;
 		int new_len;
 		put_conv(conv,data,data_len,new_data,new_len);
@@ -160,18 +160,18 @@ static void remote_cb(struct ev_loop *loop, struct ev_io *watcher, int revents)
 			mylog(log_debug,"get_conv(conv,out_arr[i],out_len[i],new_data,new_len)!=0");
 			continue;
 		}
-		if(!conn_info.conv_manager.is_conv_used(conv))
+		if(!conn_info.conv_manager.c.is_conv_used(conv))
 		{
 			mylog(log_trace,"!conn_info.conv_manager.is_conv_used(conv)");
 			continue;
 		}
 
-		conn_info.conv_manager.update_active_time(conv);
+		conn_info.conv_manager.c.update_active_time(conv);
 
-		u64_t u64=conn_info.conv_manager.find_u64_by_conv(conv);
+		address_t addr=conn_info.conv_manager.c.find_data_by_conv(conv);
 		dest_t dest;
 		dest.inner.fd_addr.fd=conn_info.local_listen_fd;
-		dest.inner.fd_ip_port.ip_port.from_u64(u64);
+		dest.inner.fd_addr.addr=addr;
 		dest.type=type_fd_addr;
 
 		delay_send(out_delay[i],dest,new_data,new_len);
@@ -224,7 +224,7 @@ static void conn_timer_cb(struct ev_loop *loop, struct ev_timer *watcher, int re
 	conn_info_t & conn_info= *((conn_info_t*)watcher->data);
 
 	//read(conn_info.timer.get_timer_fd(), &value, 8);
-	conn_info.conv_manager.clear_inactive();
+	conn_info.conv_manager.c.clear_inactive();
 	mylog(log_trace,"events[idx].data.u64==(u64_t)conn_info.timer.get_timer_fd()\n");
 
 	conn_info.stat.report_as_client();
diff --git a/tunnel_server.cpp b/tunnel_server.cpp
index d272c32..98baee3 100644
--- a/tunnel_server.cpp
+++ b/tunnel_server.cpp
@@ -64,7 +64,7 @@ void data_from_remote_or_fec_timeout_or_conn_timer(conn_info_t & conn_info,fd64_
 		assert(fd64==0);
 		//uint64_t value;
 		//read(conn_info.timer.get_timer_fd(), &value, 8);
-		conn_info.conv_manager.clear_inactive();
+		conn_info.conv_manager.s.clear_inactive();
 		if(debug_force_flush_fec)
 		{
 		from_normal_to_fec(conn_info,0,0,out_n,out_arr,out_len,out_delay);
@@ -82,10 +82,10 @@ void data_from_remote_or_fec_timeout_or_conn_timer(conn_info_t & conn_info,fd64_
 		}
 
 		//fd64_t &fd64 =conn_info.remote_fd64;
-		assert(conn_info.conv_manager.is_u64_used(fd64));
+		assert(conn_info.conv_manager.s.is_data_used(fd64));
 
-		conv=conn_info.conv_manager.find_conv_by_u64(fd64);
-		conn_info.conv_manager.update_active_time(conv);
+		conv=conn_info.conv_manager.s.find_conv_by_data(fd64);
+		conn_info.conv_manager.s.update_active_time(conv);
 		conn_info.update_active_time();
 
 		int fd=fd_manager.to_fd(fd64);
@@ -168,8 +168,8 @@ static void local_listen_cb(struct ev_loop *loop, struct ev_io *watcher, int rev
 			return;
 		}
 
-		conn_manager.insert(addr);
-		conn_info_t &conn_info=conn_manager.find(addr);
+		//conn_manager.insert(addr);
+		conn_info_t &conn_info=conn_manager.find_insert(addr);
 		conn_info.addr=addr;
 		conn_info.loop=ev_default_loop(0);
 		conn_info.local_listen_fd=local_listen_fd;
@@ -204,7 +204,7 @@ static void local_listen_cb(struct ev_loop *loop, struct ev_io *watcher, int rev
 		mylog(log_info,"new connection from %s\n",addr.get_str());
 
 	}
-	conn_info_t &conn_info=conn_manager.find(addr);
+	conn_info_t &conn_info=conn_manager.find_insert(addr);
 
 	conn_info.update_active_time();
 	int  out_n;char **out_arr;int *out_len;my_time_t *out_delay;
@@ -223,9 +223,9 @@ static void local_listen_cb(struct ev_loop *loop, struct ev_io *watcher, int rev
 		}
 
 
-		if (!conn_info.conv_manager.is_conv_used(conv))
+		if (!conn_info.conv_manager.s.is_conv_used(conv))
 		{
-			if(conn_info.conv_manager.get_size() >=max_conv_num)
+			if(conn_info.conv_manager.s.get_size() >=max_conv_num)
 			{
 				mylog(log_warn,"ignored new udp connect bc max_conv_num exceed\n");
 				continue;
@@ -244,7 +244,7 @@ static void local_listen_cb(struct ev_loop *loop, struct ev_io *watcher, int rev
 			//ev.data.u64 = fd64;
 			//ret = epoll_ctl(epoll_fd, EPOLL_CTL_ADD, new_udp_fd, &ev);
 
-			conn_info.conv_manager.insert_conv(conv, fd64);
+			conn_info.conv_manager.s.insert_conv(conv, fd64);
 			fd_manager.get_info(fd64).addr=addr;
 
 			ev_io &io_watcher=fd_manager.get_info(fd64).io_watcher;
@@ -258,8 +258,8 @@ static void local_listen_cb(struct ev_loop *loop, struct ev_io *watcher, int rev
 
 			mylog(log_info,"[%s]new conv %x,fd %d created,fd64=%llu\n",addr.get_str(),conv,new_udp_fd,fd64);
 		}
-		conn_info.conv_manager.update_active_time(conv);
-		fd64_t fd64= conn_info.conv_manager.find_u64_by_conv(conv);
+		conn_info.conv_manager.s.update_active_time(conv);
+		fd64_t fd64= conn_info.conv_manager.s.find_data_by_conv(conv);
 		dest_t dest;
 		dest.type=type_fd64;
 		dest.inner.fd64=fd64;