add srand before rand

src/local.c

@@ -914,6 +914,8 @@ int main (int argc, char **argv)
     char *conf_path = NULL;
     char *iface = NULL;
 
+    srand(time(NULL));
+
     int remote_num = 0;
     ss_addr_t remote_addr[MAX_REMOTE_NUM];
     char *remote_port = NULL;