diff --git a/main.cpp b/main.cpp
index dc28dfb..108cc97 100755
--- a/main.cpp
+++ b/main.cpp
@@ -1049,10 +1049,31 @@ int client_event_loop()
 			u32_t dest_ip;
 			string if_name_string;
 			string hw_string;
-			if(find_lower_level_info(remote_ip_uint32,dest_ip,if_name_string,hw_string)!=0)
+
+			if(retry_on_error==0)
 			{
-				mylog(log_fatal,"auto detect lower-level info failed for %s,specific it manually\n",remote_ip);
-				myexit(-1);
+				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());
 
@@ -1086,11 +1107,32 @@ int client_event_loop()
 	if(source_ip_uint32==0)
 	{
 		mylog(log_info,"get_src_adress called\n");
-		if(get_src_adress(source_ip_uint32,remote_ip_uint32,remote_port)!=0)
+		if(retry_on_error==0)
 		{
-			mylog(log_fatal,"the trick to auto get source ip failed,you should specific an ip by --source-ip\n");
-			myexit(-1);
+			if(get_src_adress(source_ip_uint32,remote_ip_uint32,remote_port)!=0)
+			{
+				mylog(log_fatal,"the trick to auto get source ip failed, maybe you dont have internet\n");
+				myexit(-1);
+			}
 		}
+		else
+		{
+			int ok=0;
+			while(!ok)
+			{
+				if(get_src_adress(source_ip_uint32,remote_ip_uint32,remote_port)!=0)
+				{
+					mylog(log_warn,"the trick to auto get source ip failed, maybe you dont have internet, retry in %d seconds\n",retry_on_error_interval);
+					sleep(retry_on_error_interval);
+				}
+				else
+				{
+					ok=1;
+				}
+
+			}
+		}
+
 	}
 	in_addr tmp;
 	tmp.s_addr=source_ip_uint32;
diff --git a/misc.cpp b/misc.cpp
index 8a123a7..264d76d 100644
--- a/misc.cpp
+++ b/misc.cpp
@@ -44,6 +44,8 @@ int auto_add_iptables_rule=0;//if -a is set
 int generate_iptables_rule=0;//if -g is set
 int generate_iptables_rule_add=0;// if --gen-add is set
 
+int retry_on_error=0;
+
 int debug_resend=0; // debug only
 
 char key_string[1000]= "secret key";// -k option
@@ -163,6 +165,7 @@ void print_help()
 	printf("    --hb-len              <number>        length of heart-beat packet, >=0 and <=1500\n");
 	printf("    --mtu-warn            <number>        mtu warning threshold, unit:byte, default:1375\n");
 	printf("    --clear                               clear any iptables rules added by this program.overrides everything\n");
+	printf("    --retry-on-error                      retry on error, allow to start udp2raw before network is initialized\n");
 	printf("    -h,--help                             print this help message\n");
 
 	//printf("common options,these options must be same on both side\n");
@@ -250,6 +253,7 @@ void process_arg(int argc, char *argv[])  //process all options
 		{"gen-rule", no_argument,    0, 'g'},
 		{"gen-add", no_argument,    0, 1},
 		{"debug", no_argument,    0, 1},
+		{"retry-on-error", no_argument,    0, 1},
 		{"clear", no_argument,    0, 1},
 		{"simple-rule", no_argument,    0, 1},
 		{"keep-rule", no_argument,    0, 1},
@@ -544,6 +548,10 @@ void process_arg(int argc, char *argv[])  //process all options
 			{
 				force_socket_buf=1;
 			}
+			else if(strcmp(long_options[option_index].name,"retry-on-error")==0)
+			{
+				retry_on_error=1;
+			}
 			else if(strcmp(long_options[option_index].name,"wait-lock")==0)
 			{
 				wait_xtables_lock=1;
diff --git a/misc.h b/misc.h
index 5415a90..95c9fda 100644
--- a/misc.h
+++ b/misc.h
@@ -87,6 +87,8 @@ extern int keep_rule; //whether to monitor the iptables rule periodly,re-add if
 extern int auto_add_iptables_rule;//if -a is set
 extern int generate_iptables_rule;//if -g is set
 extern int generate_iptables_rule_add;// if --gen-add is set
+extern int retry_on_error;
+const  int retry_on_error_interval=10;
 
 extern int debug_resend; // debug only