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This assignment provides an introduction to Mininet, a virtual testbed used for testing network tools and protocols

Computer Science

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This assignment provides an introduction to Mininet, a virtual testbed used for testing network tools and protocols. It demonstrates how to invoke Mininet from the command-line interface (CLI) utility and how to build and emulate topologies using a graphical user interface (GUI) application. A mobile ad hoc network (MANET) consists of mobile wireless nodes. The communication between these mobile nodes is carried out without any centralized control. MANET is a self-organized and self-configurable network where the mobile nodes move arbitrarily. The mobile nodes can receive and forward packets as a router. Reactive routing protocols are called on-demand routing protocols so these routing protocols are called when they are needed and the routes are built. These routes can be acquired by sending route requests through the network. The Proactive protocol is generally called table driven protocol and it detects the network layout periodically. It tries to maintain the routing table at every node which is used to detect a most feasible route to the destination from the source with less delay. All the three routing protocols are explained in a deep way during class.

Use three scenarios i.e. 20 nodes, 40 nodes and the last one is 80 nodes.

The network size is of 1000 x 1000 meters.

After that IPv4 addressing was assigned to all the nodes.

Compare three routing protocols i.e. AODV, DSR and OLSR. (Mininet-WIFI doesn’t comply with DSDV and

DSR protocol. But ‘babel’ protocol is like DSDV and AODV since its design have been influenced by the

fundamentals of the said two protocols. Batman is an enhanced version of the OLSR which is still under

development. OLSR is a proactive routing algorithm where DSR is a reactive algorithm)

The performance of these routing protocols is analyzed by three metrics: delay, network load and

throughput. The results obtained in the form of graphs, all the graphs are displayed as average.

Delay

The packet end-to-end delay is the time of generation of a packet by the source up to the destination

reception. So this is the time that a packet takes to go across the network. This time is expressed in sec.

Hence all the delays in the network are called packet end-to-end delay, like buffer queues and

transmission time. Sometimes this delay can be called as latency; it has the same meaning as delay.

Network Load

Network load represents the total load in bit/sec submitted to wireless LAN layers by all higher layers in

all WLAN nodes of the network. When there is more traffic coming on the network, and it is difficult for

the network to handle all this traffic so it is called the network load. The efficient network can easily cope

with large traffic coming in, and to make a best network, many techniques have been introduced. High

network load affects the MANET routing packets and slow down the delivery of packets for reaching to

the channel, and it results in increasing the collisions of these control packets.

Throughput

Throughput is defined as; the ratio of the total data reaches a receiver from the sender. The time it takes

by the receiver to receive the last message is called as throughput.