diff --git a/common.cpp b/common.cpp
index a22e8ac..5d19595 100644
--- a/common.cpp
+++ b/common.cpp
@@ -586,11 +586,11 @@ int set_buf_size(int fd,int socket_buf_size)
 	return 0;
 }
 
-int numbers_to_char(id_t id1,id_t id2,id_t id3,char * &data,int &len)
+int numbers_to_char(my_id_t id1,my_id_t id2,my_id_t id3,char * &data,int &len)
 {
 	static char buf[buf_len];
 	data=buf;
-	id_t tmp=htonl(id1);
+	my_id_t tmp=htonl(id1);
 	memcpy(buf,&tmp,sizeof(tmp));
 
 	tmp=htonl(id2);
@@ -599,21 +599,21 @@ int numbers_to_char(id_t id1,id_t id2,id_t id3,char * &data,int &len)
 	tmp=htonl(id3);
 	memcpy(buf+sizeof(tmp)*2,&tmp,sizeof(tmp));
 
-	len=sizeof(id_t)*3;
+	len=sizeof(my_id_t)*3;
 	return 0;
 }
 
-int char_to_numbers(const char * data,int len,id_t &id1,id_t &id2,id_t &id3)
+int char_to_numbers(const char * data,int len,my_id_t &id1,my_id_t &id2,my_id_t &id3)
 {
-	if(len<int(sizeof(id_t)*3)) return -1;
+	if(len<int(sizeof(my_id_t)*3)) return -1;
 	//id1=ntohl(  *((id_t*)(data+0)) );
 	memcpy(&id1,data+0,sizeof(id1));
 	id1=ntohl(id1);
 	//id2=ntohl(  *((id_t*)(data+sizeof(id_t))) );
-	memcpy(&id2,data+sizeof(id_t),sizeof(id2));
+	memcpy(&id2,data+sizeof(my_id_t),sizeof(id2));
 	id2=ntohl(id2);
 	//id3=ntohl(  *((id_t*)(data+sizeof(id_t)*2)) );
-	memcpy(&id3,data+sizeof(id_t)*2,sizeof(id3));
+	memcpy(&id3,data+sizeof(my_id_t)*2,sizeof(id3));
 	id3=ntohl(id3);
 	return 0;
 }
diff --git a/common.h b/common.h
index 548c3e0..68b9b69 100644
--- a/common.h
+++ b/common.h
@@ -100,7 +100,7 @@ typedef int i32_t;
 typedef unsigned short u16_t;
 typedef short i16_t;
 
-typedef u32_t id_t;
+typedef u32_t my_id_t;
 
 typedef u64_t iv_t;
 
@@ -344,8 +344,8 @@ void myexit(int a);
 unsigned short csum(const unsigned short *ptr,int nbytes);
 unsigned short csum_with_header(char* header,int hlen,const unsigned short *ptr,int nbytes);
 
-int numbers_to_char(id_t id1,id_t id2,id_t id3,char * &data,int &len);
-int char_to_numbers(const char * data,int len,id_t &id1,id_t &id2,id_t &id3);
+int numbers_to_char(my_id_t id1,my_id_t id2,my_id_t id3,char * &data,int &len);
+int char_to_numbers(const char * data,int len,my_id_t &id1,my_id_t &id2,my_id_t &id3);
 
 const int show_none=0;
 const int show_command=0x1;
diff --git a/connection.cpp b/connection.cpp
index 405a01f..fd79f60 100644
--- a/connection.cpp
+++ b/connection.cpp
@@ -429,7 +429,7 @@ int recv_bare(raw_info_t &raw_info,char* & data,int & len)//recv function with e
 	return reserved_parse_bare(data,len,data,len);
 }
 
-int send_handshake(raw_info_t &raw_info,id_t id1,id_t id2,id_t id3)// a warp for send_bare for sending handshake(this is not tcp handshake) easily
+int send_handshake(raw_info_t &raw_info,my_id_t id1,my_id_t id2,my_id_t id3)// a warp for send_bare for sending handshake(this is not tcp handshake) easily
 {
 	packet_info_t &send_info=raw_info.send_info;
 	packet_info_t &recv_info=raw_info.recv_info;
@@ -470,7 +470,7 @@ int send_safer(conn_info_t &conn_info,char type,const char* data,int len)  //saf
 
 
 
-	id_t n_tmp_id=htonl(conn_info.my_id);
+	my_id_t n_tmp_id=htonl(conn_info.my_id);
 
 	memcpy(send_data_buf,&n_tmp_id,sizeof(n_tmp_id));
 
@@ -532,18 +532,18 @@ int reserved_parse_safer(conn_info_t &conn_info,const char * input,int input_len
 
 	//char *a=recv_data_buf;
 	//id_t h_oppiste_id= ntohl (  *((id_t * )(recv_data_buf)) );
-	id_t h_oppsite_id;
+	my_id_t h_oppsite_id;
 	memcpy(&h_oppsite_id,recv_data_buf,sizeof(h_oppsite_id));
 	h_oppsite_id=ntohl(h_oppsite_id);
 
 	//id_t h_my_id= ntohl (  *((id_t * )(recv_data_buf+sizeof(id_t)))    );
-	id_t h_my_id;
-	memcpy(&h_my_id,recv_data_buf+sizeof(id_t),sizeof(h_my_id));
+	my_id_t h_my_id;
+	memcpy(&h_my_id,recv_data_buf+sizeof(my_id_t),sizeof(h_my_id));
 	h_my_id=ntohl(h_my_id);
 
 	//anti_replay_seq_t h_seq= ntoh64 (  *((anti_replay_seq_t * )(recv_data_buf  +sizeof(id_t) *2 ))   );
 	anti_replay_seq_t h_seq;
-	memcpy(&h_seq,recv_data_buf  +sizeof(id_t) *2 ,sizeof(h_seq));
+	memcpy(&h_seq,recv_data_buf  +sizeof(my_id_t) *2 ,sizeof(h_seq));
 	h_seq=ntoh64(h_seq);
 
 	if(h_oppsite_id!=conn_info.oppsite_id||h_my_id!=conn_info.my_id)
@@ -558,8 +558,8 @@ int reserved_parse_safer(conn_info_t &conn_info,const char * input,int input_len
 	}
 
 	//printf("recv _len %d\n ",recv_len);
-	data=recv_data_buf+sizeof(anti_replay_seq_t)+sizeof(id_t)*2;
-	len=input_len-(sizeof(anti_replay_seq_t)+sizeof(id_t)*2  );
+	data=recv_data_buf+sizeof(anti_replay_seq_t)+sizeof(my_id_t)*2;
+	len=input_len-(sizeof(anti_replay_seq_t)+sizeof(my_id_t)*2  );
 
 
 	if(data[0]!='h'&&data[0]!='d')
diff --git a/connection.h b/connection.h
index 1716b23..0b21f6d 100644
--- a/connection.h
+++ b/connection.h
@@ -240,14 +240,14 @@ struct conn_info_t     //stores info for a raw connection.for client ,there is o
 	u64_t last_hb_recv_time;
 	//long long last_resent_time;
 
-	id_t my_id;
-	id_t oppsite_id;
+	my_id_t my_id;
+	my_id_t oppsite_id;
 
 
 	fd64_t timer_fd64;
 	fd64_t udp_fd64;
 
-	id_t oppsite_const_id;
+	my_id_t oppsite_const_id;
 
 	blob_t *blob;
 
@@ -279,7 +279,7 @@ struct conn_manager_t  //manager for connections. for client,we dont need conn_m
  //unordered_map<int,conn_info_t *> udp_fd_mp;  //a bit dirty to used pointer,but can void unordered_map search
  //unordered_map<int,conn_info_t *> timer_fd_mp;//we can use pointer here since unordered_map.rehash() uses shallow copy
 
- unordered_map<id_t,conn_info_t *> const_id_mp;
+ unordered_map<my_id_t,conn_info_t *> const_id_mp;
 
  unordered_map<address_t,conn_info_t*> mp; //put it at end so that it de-consturcts first
 
@@ -319,7 +319,7 @@ int send_bare(raw_info_t &raw_info,const char* data,int len);//send function wit
 //int reserved_parse_bare(const char *input,int input_len,char* & data,int & len); // a sub function used in recv_bare
 int recv_bare(raw_info_t &raw_info,char* & data,int & len);//recv function with encryption but no anti replay,this is used when client and server verifys each other
 //you have to design the protocol carefully, so that you wont be affect by relay attack
-int send_handshake(raw_info_t &raw_info,id_t id1,id_t id2,id_t id3);// a warp for send_bare for sending handshake(this is not tcp handshake) easily
+int send_handshake(raw_info_t &raw_info,my_id_t id1,my_id_t id2,my_id_t id3);// a warp for send_bare for sending handshake(this is not tcp handshake) easily
 int send_safer(conn_info_t &conn_info,char type,const char* data,int len);  //safer transfer function with anti-replay,when mutually verification is done.
 int send_data_safer(conn_info_t &conn_info,const char* data,int len,u32_t conv_num);//a wrap for  send_safer for transfer data.
 //int reserved_parse_safer(conn_info_t &conn_info,const char * input,int input_len,char &type,char* &data,int &len);//subfunction for recv_safer,allow overlap
diff --git a/main.cpp b/main.cpp
index 3011f06..feef5d6 100755
--- a/main.cpp
+++ b/main.cpp
@@ -190,7 +190,7 @@ int client_on_timer(conn_info_t &conn_info) //for client. called when a timer is
 
 				send_handshake(raw_info,conn_info.my_id,0,const_id);
 				if(raw_mode==mode_icmp)
-					send_info.icmp_seq++;
+					send_info.my_icmp_seq++;
 			}
 
 			conn_info.last_hb_sent_time=get_current_time();
@@ -231,7 +231,7 @@ int client_on_timer(conn_info_t &conn_info) //for client. called when a timer is
 
 				send_handshake(raw_info,conn_info.my_id,conn_info.oppsite_id,const_id);
 				if(raw_mode==mode_icmp)
-					send_info.icmp_seq++;
+					send_info.my_icmp_seq++;
 			}
 			conn_info.last_hb_sent_time=get_current_time();
 			mylog(log_info,"(re)sent handshake2\n");
@@ -350,24 +350,24 @@ int client_on_raw_recv(conn_info_t &conn_info) //called when raw fd received a p
 			mylog(log_debug,"unexpected adress %s %s %d %d\n",recv_info.new_src_ip.get_str1(),send_info.new_dst_ip.get_str2(),recv_info.src_port,send_info.dst_port);
 			return -1;
 		}
-		if(data_len<int( 3*sizeof(id_t)))
+		if(data_len<int( 3*sizeof(my_id_t)))
 		{
 			mylog(log_debug,"too short to be a handshake\n");
 			return -1;
 		}
 		//id_t tmp_oppsite_id=  ntohl(* ((u32_t *)&data[0]));
-		id_t tmp_oppsite_id;
+		my_id_t tmp_oppsite_id;
 		memcpy(&tmp_oppsite_id,&data[0],sizeof(tmp_oppsite_id));
 		tmp_oppsite_id=ntohl(tmp_oppsite_id);
 
 		//id_t tmp_my_id=ntohl(* ((u32_t *)&data[sizeof(id_t)]));
-		id_t tmp_my_id;
-		memcpy(&tmp_my_id,&data[sizeof(id_t)],sizeof(tmp_my_id));
+		my_id_t tmp_my_id;
+		memcpy(&tmp_my_id,&data[sizeof(my_id_t)],sizeof(tmp_my_id));
 		tmp_my_id=ntohl(tmp_my_id);
 
 		//id_t tmp_oppsite_const_id=ntohl(* ((u32_t *)&data[sizeof(id_t)*2]));
-		id_t tmp_oppsite_const_id;
-		memcpy(&tmp_oppsite_const_id,&data[sizeof(id_t)*2],sizeof(tmp_oppsite_const_id));
+		my_id_t tmp_oppsite_const_id;
+		memcpy(&tmp_oppsite_const_id,&data[sizeof(my_id_t)*2],sizeof(tmp_oppsite_const_id));
 		tmp_oppsite_const_id=ntohl(tmp_oppsite_const_id);
 
 		if(tmp_my_id!=conn_info.my_id)
@@ -670,7 +670,7 @@ int server_on_raw_recv_ready(conn_info_t &conn_info,char * ip_port,char type,cha
 	{
 
 		//u32_t tmp_conv_id = ntohl(*((u32_t *) &data[0]));
-		id_t tmp_conv_id;
+		my_id_t tmp_conv_id;
 		memcpy(&tmp_conv_id,&data[0],sizeof(tmp_conv_id));
 		tmp_conv_id=ntohl(tmp_conv_id);
 
@@ -920,19 +920,19 @@ int server_on_raw_recv_handshake1(conn_info_t &conn_info,char * ip_port,char * d
 	//char ip_port[40];
 	//sprintf(ip_port,"%s:%d",my_ntoa(ip),port);
 
-	if(data_len<int( 3*sizeof(id_t)))
+	if(data_len<int( 3*sizeof(my_id_t)))
 	{
 		mylog(log_debug,"[%s] data_len=%d too short to be a handshake\n",ip_port,data_len);
 		return -1;
 	}
 	//id_t tmp_oppsite_id=  ntohl(* ((u32_t *)&data[0]));
-	id_t tmp_oppsite_id;
+	my_id_t tmp_oppsite_id;
 	memcpy(&tmp_oppsite_id,(u32_t *)&data[0],sizeof(tmp_oppsite_id));
 	tmp_oppsite_id=ntohl(tmp_oppsite_id);
 
 	//id_t tmp_my_id=ntohl(* ((u32_t *)&data[sizeof(id_t)]));
-	id_t tmp_my_id;
-	memcpy(&tmp_my_id,&data[sizeof(id_t)],sizeof(tmp_my_id));
+	my_id_t tmp_my_id;
+	memcpy(&tmp_my_id,&data[sizeof(my_id_t)],sizeof(tmp_my_id));
 	tmp_my_id=ntohl(tmp_my_id);
 
 	if(tmp_my_id==0)  //received  init handshake again
@@ -945,7 +945,7 @@ int server_on_raw_recv_handshake1(conn_info_t &conn_info,char * ip_port,char * d
 		}
 		if(raw_mode==mode_icmp)
 		{
-			send_info.icmp_seq=recv_info.icmp_seq;
+			send_info.my_icmp_seq=recv_info.my_icmp_seq;
 		}
 		send_handshake(raw_info,conn_info.my_id,tmp_oppsite_id,const_id);  //////////////send
 
@@ -956,8 +956,8 @@ int server_on_raw_recv_handshake1(conn_info_t &conn_info,char * ip_port,char * d
 		conn_info.oppsite_id=tmp_oppsite_id;
 		//id_t tmp_oppsite_const_id=ntohl(* ((u32_t *)&data[sizeof(id_t)*2]));
 
-		id_t tmp_oppsite_const_id;
-		memcpy(&tmp_oppsite_const_id,&data[sizeof(id_t)*2],sizeof(tmp_oppsite_const_id));
+		my_id_t tmp_oppsite_const_id;
+		memcpy(&tmp_oppsite_const_id,&data[sizeof(my_id_t)*2],sizeof(tmp_oppsite_const_id));
 		tmp_oppsite_const_id=ntohl(tmp_oppsite_const_id);
 
 
@@ -970,7 +970,7 @@ int server_on_raw_recv_handshake1(conn_info_t &conn_info,char * ip_port,char * d
 
 		if(raw_mode==mode_icmp)
 		{
-			send_info.icmp_seq=recv_info.icmp_seq;
+			send_info.my_icmp_seq=recv_info.my_icmp_seq;
 		}
 
 		server_on_raw_recv_pre_ready(conn_info,ip_port,tmp_oppsite_const_id);
@@ -1086,15 +1086,15 @@ int server_on_raw_recv_multi() //called when server received an raw packet
 		{
 			return 0;
 		}
-		if(data_len<int( 3*sizeof(id_t)))
+		if(data_len<int( 3*sizeof(my_id_t)))
 		{
 			mylog(log_debug,"[%s]too short to be a handshake\n",ip_port);
 			return -1;
 		}
 
 		//id_t zero=ntohl(* ((u32_t *)&data[sizeof(id_t)]));
-		id_t zero;
-		memcpy(&zero,&data[sizeof(id_t)],sizeof(zero));
+		my_id_t zero;
+		memcpy(&zero,&data[sizeof(my_id_t)],sizeof(zero));
 		zero=ntohl(zero);
 
 		if(zero!=0)
diff --git a/misc.cpp b/misc.cpp
index 0f75017..64a6411 100644
--- a/misc.cpp
+++ b/misc.cpp
@@ -42,7 +42,7 @@ int bind_addr_used=0;
 int force_source_ip=0; //if --source-ip is enabled
 int force_source_port=0;
 
-id_t const_id=0;//an id used for connection recovery,its generated randomly,it never change since its generated
+my_id_t const_id=0;//an id used for connection recovery,its generated randomly,it never change since its generated
 
 int udp_fd=-1;  //for client only. client use this fd to listen and handle udp connection
 int bind_fd=-1; //bind only,never send or recv.  its just a dummy fd for bind,so that other program wont occupy the same port
diff --git a/misc.h b/misc.h
index b472b67..70dca15 100644
--- a/misc.h
+++ b/misc.h
@@ -87,7 +87,7 @@ extern int force_source_ip; //if --source-ip is enabled
 extern int force_source_port;
 extern int source_port;
 
-extern id_t const_id;//an id used for connection recovery,its generated randomly,it never change since its generated
+extern my_id_t const_id;//an id used for connection recovery,its generated randomly,it never change since its generated
 
 extern int udp_fd;  //for client only. client use this fd to listen and handle udp connection
 extern int bind_fd; //bind only,never send or recv.  its just a dummy fd for bind,so that other program wont occupy the same port
diff --git a/network.cpp b/network.cpp
index bd9fcc8..93cb4b3 100644
--- a/network.cpp
+++ b/network.cpp
@@ -248,7 +248,7 @@ packet_info_t::packet_info_t()
 			assert(raw_ip_version==AF_INET6);
 			protocol = IPPROTO_ICMPV6;
 		}
-		icmp_seq=0;
+		my_icmp_seq=0;
 	}
 
 }
@@ -1125,7 +1125,7 @@ int send_raw_icmp(raw_info_t &raw_info, const char * payload, int payloadlen)
 	icmph->code=0;
 	icmph->id=htons(send_info.src_port);
 
-	icmph->seq=htons(send_info.icmp_seq);   /////////////modify
+	icmph->seq=htons(send_info.my_icmp_seq);   /////////////modify
 
 	memcpy(send_raw_icmp_buf+sizeof(my_icmphdr),payload,payloadlen);
 
@@ -1579,7 +1579,7 @@ int recv_raw_icmp(raw_info_t &raw_info, char *&payload, int &payloadlen)
 	}
 
 	recv_info.src_port=recv_info.dst_port=ntohs(icmph->id);
-	recv_info.icmp_seq=ntohs(icmph->seq);
+	recv_info.my_icmp_seq=ntohs(icmph->seq);
 
 	if(icmph->code!=0)
 		return -1;
@@ -2293,7 +2293,7 @@ int after_send_raw0(raw_info_t &raw_info)
 	{
 		if(program_mode==client_mode)
 		{
-			send_info.icmp_seq++;
+			send_info.my_icmp_seq++;
 		}
 	}
 	return 0;
@@ -2328,8 +2328,8 @@ int after_recv_raw0(raw_info_t &raw_info)
 	{
 		if(program_mode==server_mode)
 		{
-			if(larger_than_u16(recv_info.icmp_seq,send_info.icmp_seq))
-				send_info.icmp_seq = recv_info.icmp_seq;  //TODO only update if its larger
+			if(larger_than_u16(recv_info.my_icmp_seq,send_info.my_icmp_seq))
+				send_info.my_icmp_seq = recv_info.my_icmp_seq;  //TODO only update if its larger
 		}
 	}
 	return 0;
diff --git a/network.h b/network.h
index 35428f4..f5d5635 100644
--- a/network.h
+++ b/network.h
@@ -208,7 +208,7 @@ struct packet_info_t  //todo change this to union
 	u32_t ts,ts_ack;
 
 
-	uint16_t icmp_seq;
+	uint16_t my_icmp_seq;
 
 	bool has_ts;