diff --git a/dhcpcanon/dhcpcanon.py b/dhcpcanon/dhcpcanon.py
index 75988f9..0f13452 100755
--- a/dhcpcanon/dhcpcanon.py
+++ b/dhcpcanon/dhcpcanon.py
@@ -36,6 +36,9 @@ def main():
     parser.add_argument('--version', action='version',
                         help='version',
                         version='%(prog)s ' + __version__)
+    parser.add_argument('-s', '--delay_selecting',
+                        help='Selecting starts after a ramdon delay.',
+                        action='store_true')
     # options to looks like dhclient
     parser.add_argument(
         '-sf', metavar='script-file', nargs='?',
@@ -104,7 +107,8 @@ def main():
     dhcpcap = DHCPCAPFSM(iface=conf.iface,
                          server_port=SERVER_PORT,
                          client_port=CLIENT_PORT,
-                         scriptfile=args.sf)
+                         scriptfile=args.sf,
+                         delay_selecting=args.delay_selecting)
     dhcpcap.run()
 
 
diff --git a/dhcpcanon/dhcpcapfsm.py b/dhcpcanon/dhcpcapfsm.py
index 52bdd28..98f5315 100644
--- a/dhcpcanon/dhcpcapfsm.py
+++ b/dhcpcanon/dhcpcapfsm.py
@@ -71,7 +71,8 @@ def reset(self, iface=None, client_mac=None, xid=None, scriptfile=None):
 
     def __init__(self, iface=None, server_port=None,
                  client_port=None, client_mac=None, xid=None,
-                 scriptfile=None, delay_before_selecting=None,
+                 scriptfile=None, delay_selecting=False,
+                 delay_before_selecting=None,
                  timeout_select=None, debug_level=5, *args, **kargs):
         """Overwrites Automaton __init__ method.
 
@@ -84,6 +85,7 @@ def __init__(self, iface=None, server_port=None,
         logger.debug('Inizializating FSM.')
         super(DHCPCAPFSM, self).__init__(*args, **kargs)
         self.debug_level = debug_level
+        self.delay_selecting = delay_selecting
         self.delay_before_selecting = delay_before_selecting
         self.timeout_select = timeout_select
         self.reset(iface, client_mac, xid, scriptfile)
@@ -323,10 +325,13 @@ def INIT(self):
             self.reset()
         self.current_state = STATE_INIT
         # NOTE: see previous TODO, maybe this is not needed.
-        if self.delay_before_selecting is None:
-            delay_before_selecting = gen_delay_selecting()
+        if self.delay_selecting:
+            if self.delay_before_selecting is None:
+                delay_before_selecting = gen_delay_selecting()
+            else:
+                delay_before_selecting = self.delay_before_selecting
         else:
-            delay_before_selecting = self.delay_before_selecting
+            delay_before_selecting = 0
         self.set_timeout(self.current_state,
                          self.timeout_delay_before_selecting,
                          delay_before_selecting)