diff --git a/projects/tlayer/main.c b/projects/tlayer/main.c
index d68f07fd05..06e403b9f7 100644
--- a/projects/tlayer/main.c
+++ b/projects/tlayer/main.c
@@ -269,6 +269,7 @@ void send_tcp_bandwidth_test(char *str)
 
 	int i = 0, count;
 	char command[80];
+//	char msg_string[] = "abcdefghijklmnopqrstuvwxyz0123456789!-";
 	char msg_string[] = "abcdefghijklmnopqrstuvwxyz0123456789!-=/%$";
 
 	sscanf(str, "tcp_bw %i", &count);
@@ -561,6 +562,50 @@ void ignore(char *addr) {
 }
 #endif
 
+/* HACK: Simple mesh routing on MAC layer:
+ *
+ * This routing method is used to forward layer 3 fragments over N hops in 2 directions.
+ *
+ * Example: A <--> B <--> C <--> D (N = 4)
+ *
+ * To achieve the network topology described in the example above one has to
+ * declare the nodes A and D as "head nodes" and the nodes B and C as "routing nodes".
+ * For every static route with N hops there are always N-2 nodes which are
+ * routing nodes and 2 head nodes (start and end).
+ *
+ * A "head node" is a node receiving or sending packets of higher layers (i.e. layer 3 or higher)
+ * and does not route any fragments on the MAC layer.
+ * A "routing node" is a node forwarding fragments from local addresses < its own address to
+ * nodes (head or routing) with local address > its own address (own_address+1).
+ * It also forwards fragments from local addresses > its own address to nodes with
+ * local address < its own address (own_address-1).
+ *
+ * The variables which need to be set are static_route in sys/net/sixlowpan/sixlowmac.c for
+ * routing nodes and route_head in sys/net/sixlowpan/sixlowpan.c for head nodes. */
+void static_routing (char *str)
+	{
+	if (static_route == 0)
+		{
+		static_route = 1;
+		}
+	else
+		{
+		static_route = 0;
+		}
+	}
+
+void static_head (char *str)
+	{
+	if (route_head == 0)
+		{
+		route_head = 1;
+		}
+	else
+		{
+		route_head = 0;
+		}
+	}
+
 const shell_command_t shell_commands[] = {
     {"init", "", init},
     {"addr", "", get_r_address},
@@ -584,6 +629,8 @@ const shell_command_t shell_commands[] = {
     {"boots", "", boot_server},
     {"bootc", "", boot_client},
     {"print_nbr_cache", "", show_nbr_cache},
+    {"static_routing", "", static_routing},
+    {"static_head", "", static_head},
 #ifdef DBG_IGNORE
     {"ign", "ignore node", ignore},
 #endif
diff --git a/sys/net/destiny/destiny.c b/sys/net/destiny/destiny.c
index d5f9389d01..5f8389ec82 100644
--- a/sys/net/destiny/destiny.c
+++ b/sys/net/destiny/destiny.c
@@ -18,7 +18,7 @@
 
 void init_transport_layer(void)
 	{
-	printf("Initializing transport layer packages.\n");
+	printf("Initializing transport layer packages. Size of socket_type: %u\n", sizeof(socket_internal_t));
 	// SOCKETS
 	memset(sockets, 0, MAX_SOCKETS*sizeof(socket_internal_t));
 
diff --git a/sys/net/destiny/socket.c b/sys/net/destiny/socket.c
index f9665ea92c..8cbff0305c 100644
--- a/sys/net/destiny/socket.c
+++ b/sys/net/destiny/socket.c
@@ -18,6 +18,8 @@
 #include "sys/net/net_help/net_help.h"
 #include "sys/net/net_help/msg_help.h"
 
+socket_internal_t sockets[MAX_SOCKETS];
+
 void printf_tcp_context(tcp_hc_context_t *current_tcp_context)
 	{
 	printf("Context: %u\n", current_tcp_context->context_id);
@@ -614,6 +616,11 @@ void calculate_rto(tcp_cb_t *tcp_control, timex_t current_time)
 		{
 		rto = SECOND;
 		}
+
+//	if (((rto > (SECOND-1)) && (rto < (SECOND+1))))
+//		{
+//		printf("RTO is correct!\n");
+//		}
 	tcp_control->srtt = srtt;
 	tcp_control->rttvar = rttvar;
 	tcp_control->rto = rto;
diff --git a/sys/net/destiny/socket.h b/sys/net/destiny/socket.h
index f31a2a9450..a34bb4c5b1 100644
--- a/sys/net/destiny/socket.h
+++ b/sys/net/destiny/socket.h
@@ -189,7 +189,7 @@ typedef struct socket_in_t
 	uint8_t				tcp_input_buffer[MAX_TCP_BUFFER];
 	} socket_internal_t;
 
-socket_internal_t sockets[MAX_SOCKETS];
+extern socket_internal_t sockets[MAX_SOCKETS];
 
 int socket(int domain, int type, int protocol);
 int connect(int socket, sockaddr6_t *addr, uint32_t addrlen);
diff --git a/sys/net/destiny/tcp_timer.c b/sys/net/destiny/tcp_timer.c
index 796df93ee6..69beb79062 100644
--- a/sys/net/destiny/tcp_timer.c
+++ b/sys/net/destiny/tcp_timer.c
@@ -5,8 +5,11 @@
  *      Author: Oliver
  */
 
+#include <thread.h>
 #include <stdio.h>
+#include <string.h>
 #include <stdlib.h>
+#include <math.h>
 #include "tcp_timer.h"
 #include "vtimer.h"
 #include "thread.h"
@@ -47,10 +50,30 @@ void handle_synchro_timeout(socket_internal_t *current_socket)
 		}
 	}
 
+char *double2string (double d, int stellen) {
+  int num_int_digits = 0;
+  char* returnstr = NULL;
+
+  if ((int) d != 0)
+    num_int_digits = (int) log10 (abs((int) d)) + 1;
+  else
+    num_int_digits = 1;
+
+  returnstr = malloc (num_int_digits + 1 + stellen + 1);
+
+  sprintf (returnstr, "%.*f", stellen, d);
+
+  return returnstr;
+}
+
 void handle_established(socket_internal_t *current_socket)
 	{
 	msg_t send;
 	double current_timeout = current_socket->socket_values.tcp_control.rto;
+	if (current_timeout < SECOND)
+		{
+		current_timeout = SECOND;
+		}
 	uint8_t i;
 	if ((current_socket->socket_values.tcp_control.send_nxt > current_socket->socket_values.tcp_control.send_una) &&
 			(thread_getstatus(current_socket->send_pid) == STATUS_RECEIVE_BLOCKED))
diff --git a/sys/net/destiny/tcp_timer.h b/sys/net/destiny/tcp_timer.h
index 13deaed92b..81022ab1f6 100644
--- a/sys/net/destiny/tcp_timer.h
+++ b/sys/net/destiny/tcp_timer.h
@@ -10,12 +10,12 @@
 
 #define TCP_TIMER_RESOLUTION		500*1000
 
-#define SECOND						1000*1000
-#define TCP_TIMER_STACKSIZE			2048
+#define SECOND						1000.0f*1000.0f
+#define TCP_TIMER_STACKSIZE			2800
 #define TCP_SYN_INITIAL_TIMEOUT		6*SECOND
 #define TCP_SYN_TIMEOUT				24*SECOND
 #define TCP_MAX_SYN_RETRIES			3
-#define TCP_INITIAL_ACK_TIMEOUT		3*SECOND 	// still static, should be calculated via RTT
+#define TCP_INITIAL_ACK_TIMEOUT		3.0f*SECOND 	// still static, should be calculated via RTT
 #define TCP_ACK_MAX_TIMEOUT			30*SECOND 	// TODO: Set back to 90 Seconds
 
 #define TCP_ALPHA					1.0f/8.0f
diff --git a/sys/net/sixlowpan/sixlowmac.c b/sys/net/sixlowpan/sixlowmac.c
index 8ba3e89aa6..21492b387e 100644
--- a/sys/net/sixlowpan/sixlowmac.c
+++ b/sys/net/sixlowpan/sixlowmac.c
@@ -32,6 +32,7 @@ static radio_packet_t p;
 static msg_t mesg;
 int transceiver_type;
 static transceiver_command_t tcmd;
+uint8_t static_route = 0;
 
 uint8_t get_radio_address(void){
     int16_t address;
@@ -111,9 +112,29 @@ void recv_ieee802154_frame(void){
             hdrlen = read_802154_frame(p->data, &frame, p->length);
             length = p->length - hdrlen;
            
-            /* deliver packet to network(6lowpan)-layer */
-            lowpan_read(frame.payload, length, (ieee_802154_long_t*)&frame.src_addr,
-                  (ieee_802154_long_t*)&frame.dest_addr);
+            if (static_route == 1)
+				{
+            	if (frame.src_addr[7] < frame.dest_addr[7])
+					{
+            		ieee_802154_long_t dest_addr;
+            		frame.dest_addr[7] += 1;
+            		memcpy(&dest_addr, &frame.dest_addr, 8);
+            		send_ieee802154_frame(&dest_addr, frame.payload, frame.payload_len, 0);
+					}
+            	else
+					{
+            		ieee_802154_long_t dest_addr;
+					frame.dest_addr[7] -= 1;
+					memcpy(&dest_addr, &frame.dest_addr, 8);
+					send_ieee802154_frame(&dest_addr, frame.payload, frame.payload_len, 0);
+					}
+				}
+            else
+				{
+            	/* deliver packet to network(6lowpan)-layer */
+				lowpan_read(frame.payload, length, (ieee_802154_long_t*)&frame.src_addr,
+					  (ieee_802154_long_t*)&frame.dest_addr);
+				}
 
             p->processing--;
         }
diff --git a/sys/net/sixlowpan/sixlowmac.h b/sys/net/sixlowpan/sixlowmac.h
index ed29eea473..2786317c42 100644
--- a/sys/net/sixlowpan/sixlowmac.h
+++ b/sys/net/sixlowpan/sixlowmac.h
@@ -14,6 +14,8 @@
 #define RADIO_SND_BUF_SIZE          100
 #define RADIO_SENDING_DELAY         1000
 
+extern uint8_t static_route;
+
 uint8_t get_radio_address(void);
 void set_radio_address(uint8_t addr);
 void send_ieee802154_frame(ieee_802154_long_t *addr, uint8_t *payload, 
diff --git a/sys/net/sixlowpan/sixlowpan.c b/sys/net/sixlowpan/sixlowpan.c
index 2a5e3df83e..022404bfb0 100644
--- a/sys/net/sixlowpan/sixlowpan.c
+++ b/sys/net/sixlowpan/sixlowpan.c
@@ -58,6 +58,7 @@ char con_buf[CON_STACKSIZE];
 char lowpan_transfer_buf[LOWPAN_TRANSFER_BUF_STACKSIZE];
 lowpan_context_t contexts[LOWPAN_CONTEXT_MAX];
 uint8_t context_len = 0;
+uint8_t route_head = 0;
 
 void lowpan_context_auto_remove(void);
 
@@ -78,6 +79,18 @@ void lowpan_init(ieee_802154_long_t *addr, uint8_t *data){
     data = &comp_buf[0];
     packet_length = comp_len;
     
+    if (route_head == 1)
+		{
+		if (laddr.uint8[7] < get_radio_address())
+			{
+			laddr.uint8[7] = get_radio_address() - 1;
+			}
+		else
+			{
+			laddr.uint8[7] = get_radio_address() + 1;
+			}
+		}
+
     /* check if packet needs to be fragmented */
     if(packet_length + header_size > PAYLOAD_SIZE - IEEE_802154_MAX_HDR_LEN){
         uint8_t fragbuf[packet_length + header_size];
diff --git a/sys/net/sixlowpan/sixlowpan.h b/sys/net/sixlowpan/sixlowpan.h
index f3f3629732..5b099a72c9 100644
--- a/sys/net/sixlowpan/sixlowpan.h
+++ b/sys/net/sixlowpan/sixlowpan.h
@@ -32,6 +32,7 @@
 #include <time.h>
 
 extern mutex_t lowpan_context_mutex;
+extern uint8_t route_head;
 
 typedef struct lowpan_context_t {
     uint8_t num;