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opnet-simulator
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Preventing black hole attack in AODV through use of hash chain
, Article 2011 19th Iranian Conference on Electrical Engineering, ICEE 2011, 17 May 2011 through 19 May 2011 ; May , 2011 , Page(s): 1 ; 9789644634284 (ISBN) ; Taheri, H ; Vakilinia, S ; Sharif University of Technology
2011
Abstract
Wireless ad hoc networks are vulnerable against many types of attacks including black hole. In this paper we investigate the effect of this attack on ad hoc networks. Furthermore, we use hash chain to prevent this type of attack in a network that uses AODV as a routing protocol and results of applying this method has been investigated. Simulation results using OPNET simulator indicates that packet delivery ratio, in the presence of malicious nodes, reduces remarkably and proposed approach can prevent the effect of black hole attacks
Jitter-buffer management for VoIP over wireless LAN in a limited resource device
, Article 4th International Conference on Networking and Services, ICNS 2008, Gosier, 16 March 2008 through 21 March 2008 ; 2008 , Pages 90-95 ; 076953094X (ISBN); 9780769530949 (ISBN) ; Tabandeh, M ; Behboodi, A ; Fotowat Ahmadi, A ; Sharif University of Technology
2008
Abstract
VoIP over WLAN is a promising technology as a powerful replacement for current local wireless telephony systems. Packet timing Jitter is a constant issue in QoS of IEEE802.11 networks and exploiting an optimum jitter handling algorithm is an essential part of any VoIP over WLAN (VoWiFi) devices especially for the low cost devices with limited resources. In this paper two common algorithms using buffer as a method for Jitter handling are analyzed with relation to different traffic patterns. The effect of different buffer sizes on the quality of voice will be assessed for these patterns. Various traffic patterns were generated using OPNET and Quality of output voice was evaluated based on ITU...