diff --git a/common.cpp b/common.cpp
index 2aaf085..f6a2dec 100644
--- a/common.cpp
+++ b/common.cpp
@@ -15,6 +15,7 @@ int about_to_exit=0;
 raw_mode_t raw_mode=mode_faketcp;
 unordered_map<int, const char*> raw_mode_tostring = {{mode_faketcp, "faketcp"}, {mode_udp, "udp"}, {mode_icmp, "icmp"}};
 int socket_buf_size=1024*1024;
+int force_socket_buf=0;
 
 static int random_number_fd=-1;
 string iptables_pattern="";
@@ -328,16 +329,32 @@ unsigned short csum(const unsigned short *ptr,int nbytes) {//works both for big
 
 int set_buf_size(int fd)
 {
-    if(setsockopt(fd, SOL_SOCKET, SO_SNDBUFFORCE, &socket_buf_size, sizeof(socket_buf_size))<0)
-    {
-    	mylog(log_fatal,"SO_SNDBUFFORCE fail  socket_buf_size=%d  errno=%s\n",socket_buf_size,strerror(errno));
-    	myexit(1);
-    }
-    if(setsockopt(fd, SOL_SOCKET, SO_RCVBUFFORCE, &socket_buf_size, sizeof(socket_buf_size))<0)
-    {
-    	mylog(log_fatal,"SO_RCVBUFFORCE fail  socket_buf_size=%d  errno=%s\n",socket_buf_size,strerror(errno));
-    	myexit(1);
-    }
+	if(force_socket_buf)
+	{
+		if(setsockopt(fd, SOL_SOCKET, SO_SNDBUFFORCE, &socket_buf_size, sizeof(socket_buf_size))<0)
+		{
+			mylog(log_fatal,"SO_SNDBUFFORCE fail  socket_buf_size=%d  errno=%s\n",socket_buf_size,strerror(errno));
+			myexit(1);
+		}
+		if(setsockopt(fd, SOL_SOCKET, SO_RCVBUFFORCE, &socket_buf_size, sizeof(socket_buf_size))<0)
+		{
+			mylog(log_fatal,"SO_RCVBUFFORCE fail  socket_buf_size=%d  errno=%s\n",socket_buf_size,strerror(errno));
+			myexit(1);
+		}
+	}
+	else
+	{
+		if(setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &socket_buf_size, sizeof(socket_buf_size))<0)
+		{
+			mylog(log_fatal,"SO_SNDBUF fail  socket_buf_size=%d  errno=%s\n",socket_buf_size,strerror(errno));
+			myexit(1);
+		}
+		if(setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &socket_buf_size, sizeof(socket_buf_size))<0)
+		{
+			mylog(log_fatal,"SO_RCVBUF fail  socket_buf_size=%d  errno=%s\n",socket_buf_size,strerror(errno));
+			myexit(1);
+		}
+	}
 	return 0;
 }
 
diff --git a/common.h b/common.h
index c16b5ea..e7ddfec 100644
--- a/common.h
+++ b/common.h
@@ -107,6 +107,7 @@ enum program_mode_t {unset_mode=0,client_mode,server_mode};
 extern program_mode_t program_mode;
 extern unordered_map<int, const char*> raw_mode_tostring ;
 extern int socket_buf_size;
+extern int force_socket_buf;
 
 typedef u32_t id_t;
 
diff --git a/main.cpp b/main.cpp
index cd8ce08..be0c8d1 100755
--- a/main.cpp
+++ b/main.cpp
@@ -2615,6 +2615,7 @@ void print_help()
 	printf("                                          unless you suspect there is a bug\n");
 //	printf("\n");
 	printf("    --sock-buf            <number>        buf size for socket,>=10 and <=10240,unit:kbyte,default:1024\n");
+	printf("    --force-sock-buf                      bypass system limitation while setting sock-buf\n");
 	printf("    --seqmode             <number>        seq increase mode for faketcp:\n");
 	printf("                                          0:dont increase\n");
 	printf("                                          1:increase every packet(default)\n");
@@ -2748,6 +2749,7 @@ void process_arg(int argc, char *argv[])  //process all options
 		{"sock-buf", required_argument,    0, 1},
 		{"seq-mode", required_argument,    0, 1},
 		{"conf-file", required_argument,   0, 1},
+		{"force-sock-buf", no_argument,   0, 1},
 		{NULL, 0, 0, 0}
 	  };
 
@@ -3032,6 +3034,10 @@ void process_arg(int argc, char *argv[])  //process all options
 			{
 				//enable_log_position=1;
 			}
+			else if(strcmp(long_options[option_index].name,"force-sock-buf")==0)
+			{
+				force_socket_buf=1;
+			}
 			else if(strcmp(long_options[option_index].name,"disable-bpf")==0)
 			{
 				disable_bpf_filter=1;
diff --git a/network.cpp b/network.cpp
index fde70ca..2413dce 100644
--- a/network.cpp
+++ b/network.cpp
@@ -199,11 +199,22 @@ int init_raw_socket()
 
 	}
 
-    if(setsockopt(raw_send_fd, SOL_SOCKET, SO_SNDBUFFORCE, &socket_buf_size, sizeof(socket_buf_size))<0)
-    {
-    	mylog(log_fatal,"SO_SNDBUFFORCE fail  socket_buf_size=%d  errno=%s\n",socket_buf_size,strerror(errno));
-    	myexit(1);
-    }
+	if(force_socket_buf)
+	{
+		if(setsockopt(raw_send_fd, SOL_SOCKET, SO_SNDBUFFORCE, &socket_buf_size, sizeof(socket_buf_size))<0)
+		{
+			mylog(log_fatal,"SO_SNDBUFFORCE fail  socket_buf_size=%d  errno=%s\n",socket_buf_size,strerror(errno));
+			myexit(1);
+		}
+	}
+	else
+	{
+		if(setsockopt(raw_send_fd, SOL_SOCKET, SO_SNDBUF, &socket_buf_size, sizeof(socket_buf_size))<0)
+		{
+			mylog(log_fatal,"SO_SNDBUF fail  socket_buf_size=%d  errno=%s\n",socket_buf_size,strerror(errno));
+			myexit(1);
+		}
+	}
 
 
 
@@ -217,11 +228,22 @@ int init_raw_socket()
         myexit(1);
     }
 
-    if(setsockopt(raw_recv_fd, SOL_SOCKET, SO_RCVBUFFORCE, &socket_buf_size, sizeof(socket_buf_size))<0)
-    {
-    	mylog(log_fatal,"SO_RCVBUFFORCE fail  socket_buf_size=%d  errno=%s\n",socket_buf_size,strerror(errno));
-    	myexit(1);
-    }
+	if(force_socket_buf)
+	{
+		if(setsockopt(raw_recv_fd, SOL_SOCKET, SO_RCVBUFFORCE, &socket_buf_size, sizeof(socket_buf_size))<0)
+		{
+			mylog(log_fatal,"SO_RCVBUFFORCE fail  socket_buf_size=%d  errno=%s\n",socket_buf_size,strerror(errno));
+			myexit(1);
+		}
+	}
+	else
+	{
+		if(setsockopt(raw_recv_fd, SOL_SOCKET, SO_RCVBUF, &socket_buf_size, sizeof(socket_buf_size))<0)
+		{
+			mylog(log_fatal,"SO_RCVBUF fail  socket_buf_size=%d  errno=%s\n",socket_buf_size,strerror(errno));
+			myexit(1);
+		}
+	}
 
     //IP_HDRINCL to tell the kernel that headers are included in the packet