1000 Projects

The destination sequence distance vector routing (DSDV)

The Bellman-ford is considered as one of the general technique which is been established for the purpose of the destination sequence distance vector routing. The specific order is been sustained for the purpose of each routing entry that belongs to the routing table in order to indicate the particular information regarding the routing. Each and every node will include the different types of the routing tables which will maintain the general information such as the total number of the hops that are to be transferred towards the target node .

It will even maintain the information about the alternate hop as well as the destination series numbers. The table consistency which is towards the DSDV is been controlled in particular time as well as it will generate the updates that are obtained from each and every node in which the routing process is been carried out.

In the entire process if at all the configuration updates related to the networks are been utilized then the nodes will generate the updates and then the DSV will utilized these specific updates in order to uphold the route stability which is diagonally towards the network. The performance of different types of the protocols is entirely based on the reactions of the routing stability and in this process if the link or else the route breakdown is been detected towards the route then the infinity variable is been allotted for the routes and then the unique sequence number is been allotted by making use of the routing protocol of the DSDV.

Within the ongoing process if at all the node which is towards the route identifies the infinity metrics then it will immediately generate the updates. Then after the new route is been restored by means of the non-working route in order to sustain the routing stability of the network. Depending on the total information which is been received the updates of the routing table are been carried out that are starting from the new infinity metrics and then after they are compared by the current information which is already present in the process. Basically the updates related to the tables are been performed by considering the two different conditions such as above:

• In the entire process if at all the packet is been received by using the greater sequence number then immediately it will be replaced by the current information.
• Based on the similar sequence numbers the routing table is been updated.

The proactive routing protocols

Basically the proactive or else the table driven protocols are having the spontaneous and convenient routing entry to the target which is diagonally towards the routing table of different types of the nodes. Even though there is no necessity these specific protocols will always hold the static route towards the destination and then the sufficient quantity of the control is been maintained by these protocols. There are two different types of the protocols such as the DSDV-destination sequence distance vector as well as the OLSR- optimized link state routing which belongs to the table driven protocols.

• The destination sequence distance vector routing (DSDV)
• The optimized link state routing protocol (OLSR)

The routing protocols of MANET

Now a day’s the mobile technologies have gained more importance and for this reason the different types of the applications related to the mobile computing are been utilized all over the world. Generally there are more possibilities for the process of developing the current technologies which are having more demand. The mobile Ad Hoc networks are considered as the best one among the existing mobile technologies because it is having one of the major benefit that there is no necessity architecture and this specific networks are capable of functioning themselves which are referred to as the autonomous systems.

The typical MANET major function is to manage the routers as well as the wireless links among them. The routers are made up of the mobility nature and for this reason they are capable of moving from one specific location to the other location diagonally towards the virtual graph which is been created through the routers as well as the wireless links.

Because of the presence of the individual nature and the few infrastructure operations the MANET will be able to attached or connected to any kind of the internet as well as it could even be functioned and controlled in a separate manner . It is already been proved that the mobility is considered as the general nature of the MANET and then there are more possibilities of happening of the issues for the route or the link stability, and then there is a necessity of the appropriate routing protocols in order to assure the routing stability towards the MANETS. In general there are two different types of the routing protocols such as the proactive routing protocols( table driven) as well as the reactive routing protocols(on demand).

Improving the security for the wireless LAN network is the key study area in this paper and to achieve this two scenarios are created using the OPNET modeler simulation tool. First scenario deals with the default wireless LAN configuration and the second scenario deals with the secure wireless LAN configuration. A MANET is simulated for these purposed and 10 wireless LAN mobile nodes are used and a single wireless LAN server is created to support these nodes.

OLSR routing protocol is used for routing purpose and three applications are created in these scenarios to generate the traffic and they are video, voice and FTP and they generate the CBR and TCP traffic respectively. When the two scenarios are created they are simulated and the results are analyzed and from the analysis few observations are derived and they are as given below 

When all the scenarios are compared against the performance metrics used, it is observed the performance of the secure wireless LAN is high when compared to the normal wireless LAN configuration. Key aspects like FTP, Voice, Video and Wireless LAN metrics are compared against the scenarios and across all the comparison process the secure wireless LAN parameters has imposed an optimal conditions on the network in terms of routing, traffic sent, traffic received, jitter, load and delay.

From this indication it is understood that if the parameters of the wireless LAN are changes to ensure the safety across the network then the overall performance of the network is improved a lot across any application used in the network. Secure wireless LAN settings has ensured a optimal packet delivery ratio, reduced the congestion on the network by minimizing the traffic sent and received across the nodes and thus it is proved that wireless LAN performance is optimized with the required security considerations.

Wireless Networks Project background

Wireless networking has changed the communication patterns being followed traditionally across the world and always the increase in technology leads to improve the communication all the time. Day by day the usage of these wireless networks are increased and many number of applications are also invented in this context and these applications uses the best features of the wireless networking to make available to the end users at the optimal conditions.

In general wireless networks are popular due their seamless operation node and they can be deployed across any conditions without any specific infrastructure requirements. There are different categories to be considered across the wireless networks and the most popular among them are wireless local area networks (WLAN), where the introduction of WLAN technology has taken new trends in the communication thru wireless networks. In general this wireless LAN can be considered as the best choice of networking when there are few resources available against the networking operations.

There are different nodes and servers against the wireless LAN’s and these nodes will act as the source and the servers will act as the destination in  most of the cases and the communication among the nodes and server is purely a wireless based and there are some access points as well in this technology. This access point plays the key role in completing the communication mechanism across the network and they act as the center points in the network. The parameters that make the wireless LAN to work are the actual application being used across the wireless LAN and the nature of the traffic being generated. 

In general the wireless LAN contains mobile nodes and fixed nodes and the mobile nodes are flexible enough to move randomly to the desired position across the network and thus they have some topological problems as well. Apart from the advantages with the wireless LAN there are some basic issues and the most important among them is the security. Wireless LAN networks are prone to node level and network level attacks and they are feasible enough to encourage the attacks on the network. Mobility is the major nature of the wireless LAN that makes it to open for the security issues and these issues can be of different types like packet flooding and Dos attacks.

The behavior of the wireless LAN is completely changed due to these attacks and they can’t support the nodes anymore during the communication process and thus a perfect security model is required always and in this process there are many security models introduced and most of them are proved to helpful in identifying and preventing the corresponding security threats. In this project the simple wireless LAN topology is considered and the basic security requirements are analyzed and the impact of the security against the overall performance of the network is also studied. Importance of security for the wireless LANs is the main point considered in this research and it is improved across the simulation done in this project and the actual problem identified is given in the next section along with the proposed solution.

Paper Written and Submitted By Teja.V

Problem definition in Wireless LAN Networks

The actual problem identified in this project is that the importance of wireless LAN security to improve the overall performance of the network and also how the security can be incorporated on the network at the simulation level. OPNET modeler is used as the simulation tool and the basic network selected for the simulation of this project is Mobile Adhoc Network (MANET).

Campus is selected as the network area required for the simulation and 1000 X 1000 square meters is taken as the size of the network and therefore the creation of a fresh scale of network is done and when once all these settings are done, then the network is said to be prepared for using. OLSR routing protocol is considered as the required routing protocol and this protocol is applied for 10 mobile nodes, where these nodes are the wireless LAN mobile workstations and a single wireless LAN server is used.

In this particular scenario three applications are used for the generation of the traffic needed. The three applications used are the FTP, voice and video conferencing and these are used for the generation of TCP traffic across the MANET. Two scenarios are created and the first scenario is used at the default settings for the wireless LAN and the second scenario is improved in terms of security and the wireless LAN metrics are changed to improve the overall application and network security of the network.

Performance metrics of voice, video, FTP and Wireless LAN are considered and the overall performance of both the scenarios is analyzed against the comparison graphs to understand the behavior of the network at normal conditions and secure conditions that were imposed at the second scenario. Following are the actual aims and objective of the project and they are as given below 

Aims and Objectives

Following are the aims and objectives of this project

Aim: To evaluate the importance of security across the wireless LAN networks and simulate the proposed security model using OPNET modeler.

Following are the key objectives of this work

• To review the importance of security across the wireless LAN and understand the impact of security on the performance of the network
• To design the simulation scenarios to simulate the security model in OPNET
• To create two scenarios and the first scenario to deploy the normal conditions and the second scenario to implement the proposed security model
• To simulate the scenarios and achieve the results
• To evaluate the results against the chosen performance metrics and understand the working nature of the proposed security model
• To conclude the results and suggest the future recommendations