Lab Assignments using ns-3 - Revision history

Vedranm: Vedranm moved page NS3 Lab Assignments to Lab Assignments using ns-3: Wiki page name cleanup

2013-02-10T16:06:22Z

Vedranm moved page NS3 Lab Assignments to Lab Assignments using ns-3: Wiki page name cleanup

← Older revision	Revision as of 16:06, 10 February 2013
(No difference)

Lalith at 10:33, 4 July 2011

2011-07-04T10:33:22Z

← Older revision		Revision as of 10:33, 4 July 2011
Line 48:		Line 48:
	*# Plot graph throughput/cwnd and packet loss/cwnd for the first flow. Is there an optimal value for cwnd?		*# Plot graph throughput/cwnd and packet loss/cwnd for the first flow. Is there an optimal value for cwnd?
	*# Vary QueueSize5 and QueueSize6. Which one has immediate effect on cwnd size of the first flow? Explain why.		*# Vary QueueSize5 and QueueSize6. Which one has immediate effect on cwnd size of the first flow? Explain why.


	== Routing (Optimised Link State Routing) ==		== Routing (Optimised Link State Routing) ==

Vedranm: Better wording.

2011-07-04T07:03:15Z

Better wording.

← Older revision		Revision as of 07:03, 4 July 2011
Line 39:		Line 39:
	* '''Experiment''':		* '''Experiment''':
	*# As in previous exercise, Create a simple dumbbell topology, two client Node1 and Node2 on the left side of the dumbbell and server nodes Node3 and Node4 on the right side of the dumbbell. Let Node5 and Node6 form the bridge of the dumbbell. Use point to point links.		*# As in previous exercise, Create a simple dumbbell topology, two client Node1 and Node2 on the left side of the dumbbell and server nodes Node3 and Node4 on the right side of the dumbbell. Let Node5 and Node6 form the bridge of the dumbbell. Use point to point links.
	*# Add ~~packet~~ queues of size QueueSize5 to Node5 and ~~of QueueSize6 to~~ Node6.		*# Add drop tail queues of size QueueSize5 and QueueSize6 to Node5 and Node6, respectively.
	*# Install a TCP socket instance on Node1 that will connect to Node3.		*# Install a TCP socket instance on Node1 that will connect to Node3.
	*# Install a TCP socket instance on Node2 that will connect to Node3.		*# Install a TCP socket instance on Node2 that will connect to Node3.
Line 48:		Line 48:
	*# Plot graph throughput/cwnd and packet loss/cwnd for the first flow. Is there an optimal value for cwnd?		*# Plot graph throughput/cwnd and packet loss/cwnd for the first flow. Is there an optimal value for cwnd?
	*# Vary QueueSize5 and QueueSize6. Which one has immediate effect on cwnd size of the first flow? Explain why.		*# Vary QueueSize5 and QueueSize6. Which one has immediate effect on cwnd size of the first flow? Explain why.


	== Routing (Optimised Link State Routing) ==		== Routing (Optimised Link State Routing) ==

Lalith at 22:55, 1 July 2011

2011-07-01T22:55:57Z

← Older revision		Revision as of 22:55, 1 July 2011
Line 30:		Line 30:
	*# Mark points of fast recovery and slow start in the graphs.		*# Mark points of fast recovery and slow start in the graphs.
	*# Perform the above experiment for TCP variants Tahoe, Reno and New Reno, all of which are available with ns-3.		*# Perform the above experiment for TCP variants Tahoe, Reno and New Reno, all of which are available with ns-3.


	== TCP and router queues ==		== TCP and router queues ==
Line 47:		Line 48:
	*# Plot graph throughput/cwnd and packet loss/cwnd for the first flow. Is there an optimal value for cwnd?		*# Plot graph throughput/cwnd and packet loss/cwnd for the first flow. Is there an optimal value for cwnd?
	*# Vary QueueSize5 and QueueSize6. Which one has immediate effect on cwnd size of the first flow? Explain why.		*# Vary QueueSize5 and QueueSize6. Which one has immediate effect on cwnd size of the first flow? Explain why.


	== Routing (Optimised Link State Routing) ==		== Routing (Optimised Link State Routing) ==
Line 86:		Line 88:
	== Wifi Channels ==		== Wifi Channels ==

	* '''Level''': ~~Intermediate~~		* '''Level''': IntermediateInstall
	* '''Expected learning outcome''': How Radio channel models affect transmission. An insight into why its important to correctly model the channel.		* '''Expected learning outcome''': How Radio channel models affect transmission. An insight into why its important to correctly model the channel.

Vedranm: Queues, first attempt

2011-06-26T19:36:14Z

Queues, first attempt

← Older revision		Revision as of 19:36, 26 June 2011
Line 27:		Line 27:
	*# Start the UDP application at time 20s at rate Rate1 such that it clogs half the dumbbell bridge's link capacity.		*# Start the UDP application at time 20s at rate Rate1 such that it clogs half the dumbbell bridge's link capacity.
	*# Increase the UDP application's rate at time 30s to rate Rate2 such that it clogs the whole of the dumbbell bridge's capacity.		*# Increase the UDP application's rate at time 30s to rate Rate2 such that it clogs the whole of the dumbbell bridge's capacity.
	*# Use the ns-3 tracing mechanism to record changes in congestion window size of the TCP instance over time. Use gnuplot/matplotlib to visualise plots of ~~CWND~~ vs time.		*# Use the ns-3 tracing mechanism to record changes in congestion window size of the TCP instance over time. Use gnuplot/matplotlib to visualise plots of cwnd vs time.
	*# Mark points of fast recovery and slow start in the graphs.		*# Mark points of fast recovery and slow start in the graphs.
	*# Perform the above experiment for TCP variants Tahoe, ~~Renoe~~ and New ~~Renoe~~, all of which are available with ns-3.		*# Perform the above experiment for TCP variants Tahoe, Reno and New Reno, all of which are available with ns-3.

			== TCP and router queues ==

			* '''Level''': Introductory
			* '''Expected learning outcome''': Queues, packet drops and their effect on congestion window size.

			* '''Experiment''':
			*# As in previous exercise, Create a simple dumbbell topology, two client Node1 and Node2 on the left side of the dumbbell and server nodes Node3 and Node4 on the right side of the dumbbell. Let Node5 and Node6 form the bridge of the dumbbell. Use point to point links.
			*# Add packet queues of size QueueSize5 to Node5 and of QueueSize6 to Node6.
			*# Install a TCP socket instance on Node1 that will connect to Node3.
			*# Install a TCP socket instance on Node2 that will connect to Node3.
			*# Install a TCP socket instance on Node2 that will connect to Node4.
			*# Start Node1--Node3 flow at time 1s, then measure it's throughput. How long does it take to fill link's entire capacity?
			*# Start Node2--Node3 and Node2--Node4 flows at time 15s, measure their throughput.
			*# Measure packet loss and cwnd size, and plot graphs throughput/time, cwnd/time and packet loss/time for each of the flows.
			*# Plot graph throughput/cwnd and packet loss/cwnd for the first flow. Is there an optimal value for cwnd?
			*# Vary QueueSize5 and QueueSize6. Which one has immediate effect on cwnd size of the first flow? Explain why.

	== Routing (Optimised Link State Routing) ==		== Routing (Optimised Link State Routing) ==

Tommaso at 18:59, 24 June 2011

2011-06-24T18:59:48Z

← Older revision		Revision as of 18:59, 24 June 2011
Line 50:		Line 50:
	*# Plot the number of bytes received versus time at Node3.		*# Plot the number of bytes received versus time at Node3.
	*# Show the pcap traces at Node 2's Wifi interface, and indicate the correlation between Node2's packet reception timeline and Node2's mobility.		*# Show the pcap traces at Node 2's Wifi interface, and indicate the correlation between Node2's packet reception timeline and Node2's mobility.


	== Wifi RTS/CTS ==		== Wifi RTS/CTS ==
Line 65:		Line 66:
	*# Now repeat the experiment with RTS/CTS enabled on the wifi devices.		*# Now repeat the experiment with RTS/CTS enabled on the wifi devices.
	*# Show the difference in throughput and packet drops if any.		*# Show the difference in throughput and packet drops if any.


	== Wifi Channels ==		== Wifi Channels ==

Tommaso at 18:59, 24 June 2011

2011-06-24T18:59:19Z

← Older revision		Revision as of 18:59, 24 June 2011
Line 65:		Line 65:
	*# Now repeat the experiment with RTS/CTS enabled on the wifi devices.		*# Now repeat the experiment with RTS/CTS enabled on the wifi devices.
	*# Show the difference in throughput and packet drops if any.		*# Show the difference in throughput and packet drops if any.

			== Wifi Channels ==

			* '''Level''': Intermediate
			* '''Expected learning outcome''': How Radio channel models affect transmission. An insight into why its important to correctly model the channel.

			* '''Experiment''':
			*# Setup a 2-nodes wireless adhoc network. Place the nodes at a fixed distance in a 3d scenario.
			*# Install all the relevant network stacks, up to and including UDP.
			*# Setup a CBR transmission between the nodes, one acting as a server and one as a client. Take the iperf[http://sourceforge.net/projects/iperf] behaviour as an example.
			*# Setup counters and outputs for packets sent and received.
			*# Schedule the simulation to run for enough time to obtain statistically relevant results (suggestion: analyze some test results and reduce the simulation time accordingly).
			*# Repeat the simulation varying the distance between the nodes from a minimum of 1meter to the point where the nodes can't transmit/receive anymore.
			*# Repeat the above varying the channel models and the transmission/receive parameters like node's position above the ground, transmission power, etc.
			*# Show the differences between the various channel models, and comment them. Identify the channel model that is more appropriate for each case (indoor, outdoor, LoS, NLoS, etc.).

Tommaso: /* Routing (Optimised Link State Routing) */

2011-06-24T18:37:29Z

Routing (Optimised Link State Routing)

← Older revision		Revision as of 18:37, 24 June 2011
Line 49:		Line 49:
	*# To verify whether data transmissions occur in the above scenarios, use either the tracing mechanism or a RecvCallback() for Node3's socket.		*# To verify whether data transmissions occur in the above scenarios, use either the tracing mechanism or a RecvCallback() for Node3's socket.
	*# Plot the number of bytes received versus time at Node3.		*# Plot the number of bytes received versus time at Node3.
	*# Show the pcap traces at ~~Node2~~'s Wifi interface, and indicate the correlation between Node2's packet reception timeline and Node2's mobility.		*# Show the pcap traces at Node 2's Wifi interface, and indicate the correlation between Node2's packet reception timeline and Node2's mobility.


	== Wifi RTS/CTS ==		== Wifi RTS/CTS ==

Lalith at 15:07, 24 June 2011

2011-06-24T15:07:17Z

← Older revision		Revision as of 15:07, 24 June 2011
Line 1:		Line 1:
	This page serves as a placeholder for lab assignments that can be used ~~as a part of~~ Computer Networks coursework in universities. Feel free to add experiments to this list.		This page serves as a placeholder for ns-3 based lab assignments that can be used for Computer Networks coursework in universities. Feel free to add experiments to this list.

Lalith at 14:55, 24 June 2011

2011-06-24T14:55:37Z

← Older revision		Revision as of 14:55, 24 June 2011
Line 4:		Line 4:
	== Simple client-server communication (NS-3 Warmup) ==		== Simple client-server communication (NS-3 Warmup) ==

	** '''Level''': Introductory		* '''Level''': Introductory
	** '''Expected learning outcome''': NS-3 simulation basics. Basic client server paradigm. Reading pcap traces.		* '''Expected learning outcome''': NS-3 simulation basics. Basic client server paradigm. Reading pcap traces.

	* Experiment		* '''Experiment''':
	*# Create a simple topology of two nodes (Node1, Node2) separated by a point-to-point link.		*# Create a simple topology of two nodes (Node1, Node2) separated by a point-to-point link.
	*# Setup a UdpClient on one Node1 and a UdpServer on Node2. Let it be of a fixed data rate Rate1.		*# Setup a UdpClient on one Node1 and a UdpServer on Node2. Let it be of a fixed data rate Rate1.
Line 17:		Line 17:
	== TCP variants ==		== TCP variants ==

	** '''Level''': Introductory		* '''Level''': Introductory
	** '''Expected learning outcome''': TCP internals and the difference between each of the variants. NS-3 tracing mechanism.		* '''Expected learning outcome''': TCP internals and the difference between each of the variants. NS-3 tracing mechanism.

	* Experiment		* '''Experiment''':
	*# Create a simple dumbbell topology, two client Node1 and Node2 on the left side of the dumbbell and server nodes Node3 and Node4 on the right side of the dumbbell. Let Node5 and Node6 form the bridge of the dumbbell. Use point to point links.		*# Create a simple dumbbell topology, two client Node1 and Node2 on the left side of the dumbbell and server nodes Node3 and Node4 on the right side of the dumbbell. Let Node5 and Node6 form the bridge of the dumbbell. Use point to point links.
	*# Install a TCP socket instance on Node1 that will connect to Node3.		*# Install a TCP socket instance on Node1 that will connect to Node3.
Line 34:		Line 34:
	== Routing (Optimised Link State Routing) ==		== Routing (Optimised Link State Routing) ==

	** '''Level''': Introductory		* '''Level''': Introductory
	** '''Expected learning outcome''': What are MANETs and how they work. OLSR basics. Routing issues associated with MANETs.		* '''Expected learning outcome''': What are MANETs and how they work. OLSR basics. Routing issues associated with MANETs.

	* Experiment		* '''Experiment''':
	*# Create a wireless mobile ad-hoc network with three nodes Node1, Node2 and Node3. Install the OLSR routing protocol on these nodes.		*# Create a wireless mobile ad-hoc network with three nodes Node1, Node2 and Node3. Install the OLSR routing protocol on these nodes.
	*# Place them such that Node1 and Node3 are just out of reach of each other.		*# Place them such that Node1 and Node3 are just out of reach of each other.
Line 54:		Line 54:
	== Wifi RTS/CTS ==		== Wifi RTS/CTS ==

	** '''Level''': Introductory		* '''Level''': Introductory
	** '''Expected learning outcome''': How 802.11 works with and without RTS/CTS. An insight into why its hard to setup efficient wireless networks.		* '''Expected learning outcome''': How 802.11 works with and without RTS/CTS. An insight into why its hard to setup efficient wireless networks.

	* Experiment		* '''Experiment''':
	*# Setup a 5x5 wireless adhoc network with a grid. You may use examples/wireless/wifi-simple-adhoc-grid.cc as a base.		*# Setup a 5x5 wireless adhoc network with a grid. You may use examples/wireless/wifi-simple-adhoc-grid.cc as a base.
	*# Install the OLSR routing protocol.		*# Install the OLSR routing protocol.