Index: src/transport/gnunet-service-transport.c
===================================================================
--- src/transport/gnunet-service-transport.c	(revision 34549)
+++ src/transport/gnunet-service-transport.c	(working copy)
@@ -1168,7 +1168,7 @@
   GST_ats = GNUNET_ATS_scheduling_init (GST_cfg, &ats_request_address_change,
       NULL );
   GST_manipulation_init (GST_cfg);
-  GST_plugins_load (&GST_manipulation_recv,
+  GST_plugins_load (&GST_manipulation_recv_dropper,
                     &GST_neighbours_register_quota_notification,
                     &GST_neighbours_unregister_quota_notification,
                     &plugin_env_address_change_notification,
Index: src/transport/gnunet-service-transport_manipulation.c
===================================================================
--- src/transport/gnunet-service-transport_manipulation.c	(revision 34549)
+++ src/transport/gnunet-service-transport_manipulation.c	(working copy)
@@ -567,6 +567,17 @@
 
 }
 
+struct GNUNET_TIME_Relative
+GST_manipulation_recv_dropper (void *cls,
+    const struct GNUNET_HELLO_Address *address,
+    struct Session *session,
+    const struct GNUNET_MessageHeader *message)
+{
+    uint16_t type = ntohs(message->type);
+    if(type == GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_SYN && 0 == random() % 10)
+        return GNUNET_TIME_UNIT_ZERO;
+    return GST_manipulation_recv(cls,address,session,message);
+}
 /**
  * Initialize traffic manipulation
  *
Index: src/transport/gnunet-service-transport_manipulation.h
===================================================================
--- src/transport/gnunet-service-transport_manipulation.h	(revision 34549)
+++ src/transport/gnunet-service-transport_manipulation.h	(working copy)
@@ -81,6 +81,11 @@
     struct Session *session,
     const struct GNUNET_MessageHeader *message);
 
+struct GNUNET_TIME_Relative
+GST_manipulation_recv_dropper (void *cls,
+    const struct GNUNET_HELLO_Address *address,
+    struct Session *session,
+    const struct GNUNET_MessageHeader *message);
 /**
  * Function that will be called to manipulate ATS information according to
  * current manipulation settings