diff --git a/headerfiles.mk b/headerfiles.mk
index b7c96e91..595f628d 100644
--- a/headerfiles.mk
+++ b/headerfiles.mk
@@ -15,6 +15,7 @@ HDRS=	fifo.h \
 	serval_types.h \
 	serval.h \
 	server.h \
+	route_link.h \
 	keyring.h \
 	socket.h \
 	cli.h \
diff --git a/keyring.c b/keyring.c
index 1d61a0dd..86570809 100644
--- a/keyring.c
+++ b/keyring.c
@@ -36,6 +36,7 @@ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 #include "mem.h"
 #include "rotbuf.h"
 #include "server.h"
+#include "route_link.h"
 
 static keyring_file *keyring_open_or_create(const char *path, int writeable);
 static int keyring_initialise(keyring_file *k);
diff --git a/monitor.c b/monitor.c
index 1f8f8c21..4b9be052 100644
--- a/monitor.c
+++ b/monitor.c
@@ -66,6 +66,7 @@ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 #include "socket.h"
 #include "dataformats.h"
 #include "server.h"
+#include "route_link.h"
 
 #ifdef HAVE_UCRED_H
 #include <ucred.h>
diff --git a/overlay_address.c b/overlay_address.c
index 0311d62e..662971ca 100644
--- a/overlay_address.c
+++ b/overlay_address.c
@@ -36,6 +36,7 @@ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 #include "overlay_interface.h"
 #include "overlay_packet.h"
 #include "server.h"
+#include "route_link.h"
 
 #define MAX_BPIS 1024
 #define BPI_MASK 0x3ff
diff --git a/overlay_interface.c b/overlay_interface.c
index 865d3e35..934ec462 100644
--- a/overlay_interface.c
+++ b/overlay_interface.c
@@ -38,6 +38,7 @@ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 #include "str.h"
 #include "radio_link.h"
 #include "server.h"
+#include "route_link.h"
 
 #ifdef HAVE_IFADDRS_H
 #include <ifaddrs.h>
diff --git a/overlay_link.c b/overlay_link.c
index 7210221b..c1c17593 100644
--- a/overlay_link.c
+++ b/overlay_link.c
@@ -27,6 +27,7 @@ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 #include "overlay_packet.h"
 #include "keyring.h"
 #include "strbuf_helpers.h"
+#include "route_link.h"
 
 int set_reachable(struct subscriber *subscriber, 
   struct network_destination *destination, struct subscriber *next_hop){
diff --git a/overlay_mdp_services.c b/overlay_mdp_services.c
index 8e3a0078..6e419ae1 100644
--- a/overlay_mdp_services.c
+++ b/overlay_mdp_services.c
@@ -32,6 +32,7 @@ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 #include "debug.h"
 #include "keyring.h"
 #include "dataformats.h"
+#include "route_link.h"
 
 int rhizome_mdp_send_block(struct subscriber *dest, const rhizome_bid_t *bid, uint64_t version, uint64_t fileOffset, uint32_t bitmap, uint16_t blockLength)
 {
diff --git a/overlay_olsr.c b/overlay_olsr.c
index e1708388..9680e1f1 100644
--- a/overlay_olsr.c
+++ b/overlay_olsr.c
@@ -66,6 +66,7 @@
 #include "overlay_packet.h"
 #include "overlay_buffer.h"
 #include "overlay_address.h"
+#include "route_link.h"
 
 #define PACKET_FORMAT_NUMBER 123
 
diff --git a/overlay_packetformats.c b/overlay_packetformats.c
index 4218b35c..9203d880 100644
--- a/overlay_packetformats.c
+++ b/overlay_packetformats.c
@@ -26,7 +26,7 @@ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 #include "overlay_buffer.h"
 #include "overlay_interface.h"
 #include "overlay_packet.h"
-
+#include "route_link.h"
 
 struct sockaddr_in loopback;
 
@@ -260,7 +260,7 @@ int parseMdpPacketHeader(struct decode_context *context, struct overlay_frame *f
 int parseEnvelopeHeader(struct decode_context *context, struct overlay_interface *interface, 
 			struct socket_address *addr, struct overlay_buffer *buffer){
   IN();
-  
+
   context->interface = interface;
   if (interface->ifconfig.point_to_point && interface->other_device)
     context->point_to_point_device = interface->other_device;
@@ -422,7 +422,10 @@ int packetOkOverlay(struct overlay_interface *interface,unsigned char *packet, s
 	  unsigned char *current = ob_ptr(b)+ob_position(b);
 	  if (IF_DEBUG(overlayframes))
 	    dump("Payload Header", header_start, current - header_start);
-	  ret = WHYF("Invalid payload length (%zd)", payload_len);
+	  ret = WHYF("Payload length %zd suggests frame should be %zd bytes, but was only %zd", 
+	             payload_len, ob_position(b)+payload_len, len);
+	  
+	  // TODO signal reduced MTU?
 	  goto end;
 	}
 	break;
diff --git a/overlay_queue.c b/overlay_queue.c
index fcb76c6b..48e00a94 100644
--- a/overlay_queue.c
+++ b/overlay_queue.c
@@ -26,6 +26,7 @@
 #include "radio_link.h"
 #include "str.h"
 #include "strbuf.h"
+#include "route_link.h"
 
 typedef struct overlay_txqueue {
   struct overlay_frame *first;
diff --git a/route_link.c b/route_link.c
index 4a9a28f3..f617a018 100644
--- a/route_link.c
+++ b/route_link.c
@@ -28,6 +28,7 @@ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 #include "keyring.h"
 #include "server.h"
 #include "mdp_client.h"
+#include "route_link.h"
 
 /*
 Link state routing;
@@ -746,6 +747,22 @@ int link_interface_has_neighbours(struct overlay_interface *interface)
   return 0;
 }
 
+int link_destination_has_neighbours(struct network_destination *dest)
+{
+  struct neighbour *n = neighbours;
+  time_ms_t now = gettime_ms();
+  while(n){
+    struct link_out *l = n->out_links;
+    while(l){
+      if (l->destination == dest && l->timeout >= now)
+	return 1;
+      l=l->_next;
+    }
+    n=n->_next;
+  }
+  return 0;
+}
+
 static int send_legacy_self_announce_ack(struct neighbour *neighbour, struct link_in *link, time_ms_t now){
   struct overlay_frame *frame=emalloc_zero(sizeof(struct overlay_frame));
   frame->type = OF_TYPE_SELFANNOUNCE_ACK;
@@ -1232,7 +1249,7 @@ static void create_out_links(struct neighbour *neighbour, overlay_interface *int
 }
 
 // track stats for receiving packets from this neighbour
-int link_received_packet(struct decode_context *context, int sender_seq, char unicast)
+int link_received_packet(struct decode_context *context, int sender_seq, uint8_t unicast)
 {
   if (!context->sender)
     return 0;
diff --git a/route_link.h b/route_link.h
new file mode 100644
index 00000000..9aa1bcf6
--- /dev/null
+++ b/route_link.h
@@ -0,0 +1,49 @@
+/* 
+Serval DNA header file
+Copyright (C) 2015 Serval Project Inc.
+
+This program is free software; you can redistribute it and/or
+modify it under the terms of the GNU General Public License
+as published by the Free Software Foundation; either version 2
+of the License, or (at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+*/
+
+#ifndef __SERVAL_DNA__ROUTE_LINK_H
+#define __SERVAL_DNA__ROUTE_LINK_H
+
+struct strbuf;
+struct overlay_interface;
+struct network_destination;
+struct subscriber;
+struct overlay_frame;
+struct decode_context;
+struct internal_mdp_header;
+
+int link_state_announce_links();
+void link_neighbour_short_status_html(struct strbuf *b, const char *link_prefix);
+void link_neighbour_status_html(struct strbuf *b, struct subscriber *neighbour);
+int link_has_neighbours();
+int link_interface_has_neighbours(struct overlay_interface *interface);
+int link_destination_has_neighbours(struct network_destination *dest);
+int link_stop_routing(struct subscriber *subscriber);
+int link_add_destinations(struct overlay_frame *frame);
+int link_state_should_forward_broadcast(struct subscriber *transmitter);
+int link_state_ack_soon(struct subscriber *subscriber);
+int link_received_duplicate(struct decode_context *context, int payload_seq);
+int link_received_packet(struct decode_context *context, int sender_seq, uint8_t unicast);
+int link_unicast_ack(struct subscriber *subscriber, struct overlay_interface *interface, struct socket_address *addr);
+int link_receive(struct internal_mdp_header *header, struct overlay_buffer *payload);
+void link_explained(struct subscriber *subscriber);
+void link_interface_down(struct overlay_interface *interface);
+int link_state_legacy_ack(struct overlay_frame *frame, time_ms_t now);
+
+#endif
diff --git a/serval.h b/serval.h
index ce8b1236..a67df4ff 100644
--- a/serval.h
+++ b/serval.h
@@ -302,21 +302,4 @@ int unpack_uint(unsigned char *buffer, int buff_size, uint64_t *v);
 void rhizome_fetch_log_short_status();
 extern char crash_handler_clue[1024];
 
-int link_received_duplicate(struct decode_context *context, int payload_seq);
-int link_received_packet(struct decode_context *context, int sender_seq, char unicast);
-int link_receive(struct internal_mdp_header *header, struct overlay_buffer *payload);
-void link_explained(struct subscriber *subscriber);
-void link_interface_down(struct overlay_interface *interface);
-int link_state_announce_links();
-int link_state_legacy_ack(struct overlay_frame *frame, time_ms_t now);
-int link_state_ack_soon(struct subscriber *sender);
-int link_state_should_forward_broadcast(struct subscriber *transmitter);
-int link_unicast_ack(struct subscriber *subscriber, struct overlay_interface *interface, struct socket_address *addr);
-int link_add_destinations(struct overlay_frame *frame);
-void link_neighbour_short_status_html(struct strbuf *b, const char *link_prefix);
-void link_neighbour_status_html(struct strbuf *b, struct subscriber *neighbour);
-int link_stop_routing(struct subscriber *subscriber);
-int link_has_neighbours();
-int link_interface_has_neighbours(struct overlay_interface *interface);
-
 #endif // __SERVAL_DNA__SERVAL_H
diff --git a/server.c b/server.c
index e45da876..d7936b1e 100644
--- a/server.c
+++ b/server.c
@@ -38,6 +38,7 @@ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 #include "keyring.h"
 #include "commandline.h"
 #include "mdp_client.h"
+#include "route_link.h"
 
 #define PROC_SUBDIR	  "proc"
 #define PIDFILE_NAME	  "servald.pid"
diff --git a/server_httpd.c b/server_httpd.c
index 59a1c82b..095f022a 100644
--- a/server_httpd.c
+++ b/server_httpd.c
@@ -5,6 +5,7 @@
 #include "overlay_address.h"
 #include "overlay_interface.h"
 #include "os.h"
+#include "route_link.h"
 
 DECLARE_HANDLER("/static/", static_page);
 DECLARE_HANDLER("/interface/", interface_page);