diff --git a/socket-options-ipv4.py b/socket-options-ipv4.py
new file mode 100644
index 0000000..b275da4
--- /dev/null
+++ b/socket-options-ipv4.py
@@ -0,0 +1,149 @@
+#	socket-options-ipv4.py
+
+#	15-11-2017
+ 
+# Network topology
+#
+#      n0              n1
+#      |               |
+#      =================
+#             LAN
+#
+# UDP flows from n0 to n1
+
+import ns3
+import ns.core
+import ns.csma
+import ns.internet
+import ns.network
+import sys
+
+
+def ReceivePacket (socket):
+
+	print "received one packet!"
+	packet = socket.Recv()
+	tosTag = ns3.socket.SocketIpTosTag();
+	
+	if packet.RemovePacketTag(tosTag) == True:
+		print ("TOS = ",tosTag.GetTos ())
+	
+	ttlTag = ns3.socket.SocketIpTtlTag();
+	
+	if packet.RemovePacketTag(ttlTag) == True:
+		print ("TTL = ",ttlTag.GetTtl ())
+
+
+def SendPacket (args, socket, pktSize, pktCount, pktInterval):
+  	
+  	if pktCount > 0 :
+		print "packet sent"     		
+		p = ns.network.Packet(pktSize)
+     		socket.Send (p)
+    		ns.core.Simulator.Schedule (pktInterval, SendPacket,"args", socket, pktSize,pktCount - 1, pktInterval)
+			
+	else:
+     		socket.Close ()
+
+def main(argv):
+	
+#
+# Allow the user to override any of the defaults and the above Bind() at
+# run-time, via command-line arguments
+#
+	cmd = ns.core.CommandLine()
+
+	cmd.packetSize = 1024 
+	cmd.packetCount = 10
+	cmd.packetInterval = 1.0
+
+# Socket options for IPv4, currently TOS, TTL, RECVTOS, and RECVTTL
+	cmd.ipTos = 0
+	cmd.ipRecvTos = True 
+	cmd.ipTtl = 0
+	cmd.ipRecvTtl = True 
+
+	cmd.AddValue ("packetSize", "Packet size in bytes");
+	cmd.AddValue ("packetCount", "Number of packets to send");
+	cmd.AddValue ("packetInterval", "Interval between packets");
+	cmd.AddValue ("ipTos", "IP_TOS");
+	cmd.AddValue ("ipRecvTos", "IP_RECVTOS");
+	cmd.AddValue ("ipTtl", "IP_TTL");
+	cmd.AddValue ("ipRecvTtl", "IP_RECVTTL");
+	
+	cmd.Parse(sys.argv)
+
+	packetSize = int(cmd.packetSize) 
+	packetCount = int(cmd.packetCount)
+	packetInterval = float(cmd.packetInterval)
+	ipTos = int(cmd.ipTos)
+	ipRecvTos = bool(cmd.ipRecvTos) 
+	ipTtl = int(cmd.ipTtl)
+	ipRecvTtl = bool(cmd.ipRecvTtl) 
+
+	print "Create nodes."
+	nodes = ns.network.NodeContainer()
+	nodes.Create(2)
+
+	internet = ns.internet.InternetStackHelper()
+	internet.Install (nodes)
+
+	print "Create channels."
+	csma = ns.csma.CsmaHelper()
+	csma.SetChannelAttribute("DataRate", ns.core.StringValue("5Mbps"))
+	csma.SetChannelAttribute("Delay", ns.core.TimeValue(ns.core.MilliSeconds(2)))
+	csma.SetDeviceAttribute("Mtu", ns.core.UintegerValue(1400))
+
+	devices = csma.Install(nodes)
+
+	print "Assign IP addresses."
+	ipv4 = ns.internet.Ipv4AddressHelper()
+	ipv4.SetBase(ns.network.Ipv4Address("10.1.1.0"), ns.network.Ipv4Mask("255.255.255.0"))
+	i = ipv4.Assign(devices)
+	serverAddress = ns.network.Address (i.GetAddress(1))
+
+	print "Create sockets."
+	# Receiver socket on n1
+	tid = ns3.TypeId.LookupByName("ns3::UdpSocketFactory")
+	recvSink = ns3.Socket.CreateSocket(nodes.Get(1),tid)
+	recvSink.SetIpRecvTos(ipRecvTos)
+	recvSink.SetIpRecvTtl(ipRecvTtl)
+	recvSink.Bind(ns3.InetSocketAddress(ns3.Ipv4Address.GetAny(),4477))
+	recvSink.SetRecvCallback (ReceivePacket)
+	
+	# Sender socket on n0
+	source = ns3.Socket.CreateSocket(nodes.Get(0),tid)
+	remote = ns.network.InetSocketAddress(i.GetAddress(1),4477)
+
+	# Set socket options, it is also possible to set the options after the socket has been created/connected.
+	if ipTos > 0:
+		source.SetIpTos (ipTos)
+	if ipTtl > 0:
+		source.SetIpTtl (ipTtl)
+	source.Connect (remote)
+
+	ascii = ns.network.AsciiTraceHelper ()
+	csma.EnableAsciiAll(ascii.CreateFileStream("socket-options-ipv4.tr"))
+	csma.EnablePcapAll ("socket-options-ipv4", True)
+	
+	# Schedule SendPacket
+	interPacketInterval = ns.core.Seconds(packetInterval)
+	ns.core.Simulator.ScheduleWithContext (source.GetNode ().GetId (),ns.core.Seconds (1.0), SendPacket, source, packetSize, packetCount, interPacketInterval)
+
+
+	print "Run Simulation."
+	ns.core.Simulator.Run()
+	ns.core.Simulator.Destroy()
+
+	print "Done."
+
+
+if __name__ == '__main__':
+    main (sys.argv)
+
+  
+
+
+
+
+