diff --git a/makefile b/makefile
index 211ed32..bcb35dc 100755
--- a/makefile
+++ b/makefile
@@ -10,7 +10,7 @@ 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.cpp encrypt.cpp log.cpp network.cpp common.cpp  connection.cpp misc.cpp fd_manager.cpp -lpthread my_ev.cpp -isystem libev -lpcap -D_DEFAULT_SOURCE #`libnet-config --defines` `libnet-config --libs` 
+COMMON=main.cpp lib/md5.cpp encrypt.cpp log.cpp network.cpp common.cpp  connection.cpp misc.cpp fd_manager.cpp -lpthread my_ev.cpp -isystem libev -lpcap -D_DEFAULT_SOURCE `libnet-config --defines` `libnet-config --libs` 
 
 SOURCES= $(COMMON) lib/aes_faster_c/aes.cpp lib/aes_faster_c/wrapper.cpp
 SOURCES_TINY_AES= $(COMMON) lib/aes.cpp
diff --git a/network.cpp b/network.cpp
index a21b697..8a0406d 100644
--- a/network.cpp
+++ b/network.cpp
@@ -856,6 +856,7 @@ int send_raw_ip(raw_info_t &raw_info,const char * payload,int payloadlen)
     if(! send_with_pcap)
     {
 #ifndef NO_LIBNET
+	    
 		g_ptag=libnet_build_ipv4(ip_tot_len, iph->tos, ntohs(iph->id), ntohs(iph->frag_off),
 			iph->ttl , iph->protocol , iph->check , iph->saddr, iph->daddr,
 			(const unsigned char *)payload, payloadlen, libnet_handle, g_ptag);
@@ -866,6 +867,13 @@ int send_raw_ip(raw_info_t &raw_info,const char * payload,int payloadlen)
 		ret= libnet_write(libnet_handle);
 
 		assert(ret!=-1);
+
+
+	    /*
+		iph->tot_len=htons(ip_tot_len);
+		iph->check =csum ((unsigned short *) send_raw_ip_buf, iph->ihl*4);
+		libnet_write_raw_ipv4(libnet_handle,(const unsigned char *)send_raw_ip_buf,ip_tot_len);  //this api is marked as internal, so avoid using it.
+		*/ 
 #endif
     }
     else