diff --git a/common.h b/common.h
index 3b5719f..90a9a8d 100644
--- a/common.h
+++ b/common.h
@@ -64,7 +64,7 @@ typedef short i16_t;
 
 typedef u64_t my_time_t;
 
-const int max_data_len=2200;
+const int max_data_len=3600;
 const int buf_len=max_data_len+200;
 
 
diff --git a/misc.cpp b/misc.cpp
index f50a6d1..78e26fc 100644
--- a/misc.cpp
+++ b/misc.cpp
@@ -579,6 +579,7 @@ void process_arg(int argc, char *argv[])
 		{"tun-mtu", required_argument,    0, 1},
 		{"disable-mssfix", no_argument,    0, 1},
 		{"keep-reconnect", no_argument,    0, 1},
+		{"interval", required_argument,   0,'i'},
 		{NULL, 0, 0, 0}
       };
     int option_index = 0;