diff --git a/lab Task : socket-options-ipv4.py b/lab Task : socket-options-ipv4.py
new file mode 100644
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+++ b/lab Task : socket-options-ipv4.py	
@@ -0,0 +1,162 @@
+# /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+# /*
+# * This program is free software; you can redistribute it and/or modify
+# * it under the terms of the GNU General Public License version 2 as
+# * published by the Free Software Foundation;
+# *
+# * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+# */
+
+#  Network topology
+#
+#         n0              n1
+#          |               |
+#         =================
+#                LAN
+#
+#   - UDP flows from n0 to n1
+
+import ns3
+import ns.core
+import ns.csma
+import ns.applications
+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.GetTos ()
+
+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 ("Interval", "Interval between packets")
+    cmd.AddValue ("IP_TOS", "IP_TOS")
+    cmd.AddValue ("IP_RECVTOS", "IP_RECVTOS")
+    cmd.AddValue ("IP_TTL", "IP_TTL")
+    cmd.AddValue ("IP_RECVTTL", "IP_RECVTTL")
+    cmd.Parse (sys.argv)
+
+    packetSize = int(cmd.packetSize)
+    packetCount = int(cmd.packetCount)
+    packetInterval = float(cmd.Interval)
+    IP_TOS = int(cmd.IP_TOS)
+    IP_RECVTOS = bool(cmd.IP_RECVTOS)
+    IP_TTL = int(cmd.IP_TTL)
+    IP_RECVTTL = bool(cmd.IP_RECVTTL)
+
+    print "Create nodes"
+    n = ns.network.NodeContainer ()
+    n.Create (2)
+
+    internet = ns.internet.InternetStackHelper ()
+    internet.Install (n)
+
+    serverAddress = ns.network.Address
+
+    print "Create channels."
+	csma = ns.csma.CsmaHelper ()
+	csma.SetChannelAttribute ("DataRate", ns.core.StringValue ("5000000"))
+	csma.SetChannelAttribute ("Delay", ns.core.TimeValue (ns.core.MilliSeconds (2)))
+	csma.SetDeviceAttribute ("Mtu", ns.core.UintegerValue (1400))
+	d = csma.Install (n)
+
+	print "Assign IP Addresses."
+    address = ns.internet.Ipv4AddressHelper ()
+    address.SetBase (ns.network.Ipv4Address ("10.1.1.0"), ns.network.Ipv4Mask ("255.255.255.0"))
+    i = address.Assign (devices)
+    serverAddress = ns.network.Address (i.GetAddress (1))
+
+    print " Create sockets"
+
+    #
+    # Receiver socket on n1
+    #
+    tid = ns3.TypeId.LookupByName ("ns3::UdpSocketFactory")
+    local = ns3.InetSocketAddress (ns3.Ipv4Address.GetAny (), 4477)
+
+    recvSink.SetIpRecvTos (ipRecvTos);
+    recvSink.SetIpRecvTtl (ipRecvTtl);
+    recvSink.Bind (local);
+    recvSink.SetRecvCallback (ReceivePacket);
+
+    #
+    # sender socket on n0
+    #
+    source = ns3.Socket.CreateSocket (n.Get (0), tid)
+    remote = ns3.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", false)
+
+    #
+    # Schedule send packet
+    #
+    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__':
+        import sys
+        main (sys.argv)