diff --git a/common.h b/common.h
index cbe78a5..839b622 100644
--- a/common.h
+++ b/common.h
@@ -48,6 +48,8 @@
 #include <byteswap.h>
 #include <pthread.h>
 
+#include <my_ev.h>
+
 #include<unordered_map>
 #include <fstream>
 #include <string>
diff --git a/main.cpp b/main.cpp
index 16cfebe..87eed2b 100755
--- a/main.cpp
+++ b/main.cpp
@@ -474,81 +474,6 @@ int client_event_loop()
 	conn_info.prepare();
 	packet_info_t &send_info=conn_info.raw_info.send_info;
 	packet_info_t &recv_info=conn_info.raw_info.recv_info;
-
-	if(lower_level)
-	{
-		if(lower_level_manual)
-		{
-			int index;
-			init_ifindex(if_name,index);
-			//init_ifindex(if_name);
-			memset(&send_info.addr_ll, 0, sizeof(send_info.addr_ll));
-			send_info.addr_ll.sll_family = AF_PACKET;
-			send_info.addr_ll.sll_ifindex =index;
-			send_info.addr_ll.sll_halen = ETHER_ADDR_LEN;
-			send_info.addr_ll.sll_protocol = htons(ETH_P_IP);
-			memcpy(&send_info.addr_ll.sll_addr, dest_hw_addr, ETHER_ADDR_LEN);
-			mylog(log_info,"we are running at lower-level (manual) mode\n");
-		}
-		else
-		{
-			u32_t dest_ip;
-			string if_name_string;
-			string hw_string;
-
-			if(retry_on_error==0)
-			{
-				if(find_lower_level_info(remote_ip_uint32,dest_ip,if_name_string,hw_string)!=0)
-				{
-					mylog(log_fatal,"auto detect lower-level info failed for %s,specific it manually\n",remote_ip);
-					myexit(-1);
-				}
-			}
-			else
-			{
-				int ok=0;
-				while(!ok)
-				{
-					if(find_lower_level_info(remote_ip_uint32,dest_ip,if_name_string,hw_string)!=0)
-					{
-						mylog(log_warn,"auto detect lower-level info failed for %s,retry in %d seconds\n",remote_ip,retry_on_error_interval);
-						sleep(retry_on_error_interval);
-					}
-					else
-					{
-						ok=1;
-					}
-
-				}
-			}
-			mylog(log_info,"we are running at lower-level (auto) mode,%s %s %s\n",my_ntoa(dest_ip),if_name_string.c_str(),hw_string.c_str());
-
-			u32_t hw[6];
-			memset(hw, 0, sizeof(hw));
-			sscanf(hw_string.c_str(), "%x:%x:%x:%x:%x:%x",&hw[0], &hw[1], &hw[2],
-					&hw[3], &hw[4], &hw[5]);
-
-			mylog(log_warn,
-					"make sure this is correct:   if_name=<%s>  dest_mac_adress=<%02x:%02x:%02x:%02x:%02x:%02x>  \n",
-					if_name_string.c_str(), hw[0], hw[1], hw[2], hw[3], hw[4], hw[5]);
-			for (int i = 0; i < 6; i++) {
-				dest_hw_addr[i] = uint8_t(hw[i]);
-			}
-
-			//mylog(log_fatal,"--lower-level auto for client hasnt been implemented\n");
-			int index;
-			init_ifindex(if_name_string.c_str(),index);
-
-			memset(&send_info.addr_ll, 0, sizeof(send_info.addr_ll));
-			send_info.addr_ll.sll_family = AF_PACKET;
-			send_info.addr_ll.sll_ifindex = index;
-			send_info.addr_ll.sll_halen = ETHER_ADDR_LEN;
-			send_info.addr_ll.sll_protocol = htons(ETH_P_IP);
-			memcpy(&send_info.addr_ll.sll_addr, dest_hw_addr, ETHER_ADDR_LEN);
-			//mylog(log_info,"we are running at lower-level (manual) mode\n");
-		}
-
-	}
 	
 	if(source_ip_uint32==0)
 	{
diff --git a/makefile b/makefile
index 54e2ac2..cc3074e 100755
--- a/makefile
+++ b/makefile
@@ -10,7 +10,8 @@ cc_arm= /toolchains/arm-2014.05/bin/arm-none-linux-gnueabi-g++
 #cc_bcm2708=/home/wangyu/raspberry/tools/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian/bin/arm-linux-gnueabihf-g++ 
 FLAGS= -std=c++11 -Wall -Wextra -Wno-unused-variable -Wno-unused-parameter -Wno-missing-field-initializers ${OPT}
 
-COMMON=main.cpp lib/md5.c encrypt.cpp log.cpp network.cpp common.cpp  connection.cpp misc.cpp fd_manager.cpp -lpthread
+COMMON=main.cpp lib/md5.c encrypt.cpp log.cpp network.cpp common.cpp  connection.cpp misc.cpp fd_manager.cpp -lpthread my_ev.cpp -isystem libev
+
 SOURCES= $(COMMON) lib/aes_faster_c/aes.c lib/aes_faster_c/wrapper.c
 SOURCES_TINY_AES= $(COMMON) lib/aes.c
 SOURCES_AES_ACC=$(COMMON) $(wildcard lib/aes_acc/aes*.c)
diff --git a/misc.cpp b/misc.cpp
index 1b583a5..e721882 100644
--- a/misc.cpp
+++ b/misc.cpp
@@ -435,6 +435,7 @@ void process_arg(int argc, char *argv[])  //process all options
 		case 'h':
 			break;
 		case 'a':
+			assert(0==1);
 			auto_add_iptables_rule=1;
 			break;
 		case 'g':
@@ -522,6 +523,7 @@ void process_arg(int argc, char *argv[])  //process all options
 			}
 			else if(strcmp(long_options[option_index].name,"lower-level")==0)
 			{
+				assert(0==1);
 				process_lower_level_arg();
 				//lower_level=1;
 				//strcpy(lower_level_arg,optarg);
diff --git a/my_ev.cpp b/my_ev.cpp
new file mode 100644
index 0000000..5880a4c
--- /dev/null
+++ b/my_ev.cpp
@@ -0,0 +1,16 @@
+#pragma GCC diagnostic push
+
+#pragma GCC diagnostic ignored "-Wextra"
+#pragma GCC diagnostic ignored "-Wsign-compare"
+#pragma GCC diagnostic ignored "-Wcomment"
+#pragma GCC diagnostic ignored "-Wparentheses"
+#pragma GCC diagnostic ignored "-Wstrict-aliasing"
+#pragma GCC diagnostic ignored "-Wunused-value"
+
+#pragma GCC diagnostic ignored "-Wall"
+#pragma GCC diagnostic ignored "-W"
+
+#include "my_ev_common.h"
+#include "ev.c"
+
+#pragma GCC diagnostic pop
diff --git a/my_ev.h b/my_ev.h
new file mode 100644
index 0000000..c0c0e24
--- /dev/null
+++ b/my_ev.h
@@ -0,0 +1,5 @@
+#pragma once
+
+#include "my_ev_common.h"
+#include "ev.h"
+
diff --git a/my_ev_common.h b/my_ev_common.h
new file mode 100644
index 0000000..0755f45
--- /dev/null
+++ b/my_ev_common.h
@@ -0,0 +1,5 @@
+
+#define EV_STANDALONE 1
+#define EV_COMMON  void *data; unsigned long long u64;
+#define EV_COMPAT3 0
+//#define EV_VERIFY 2