KauNet

Garcia, Johan; Conchon, Emmanuel; Pérennou, Tanguy; Brunström, Anna

doi:10.1145/1247721.1247726

Cited by 22 publications

References 15 publications

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Network in a Box: Facilitating problem‐based learning through network emulation

Öztürk

2011

Comp Applic In Engineering

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Problem-based learning (PBL) is a pedagogical method that challenges students to ''learn how to learn'' by working cooperatively in groups to develop solutions to real world problems. Network in a Box (NiB) is a unique, engineering-oriented effort to employ PBL in core computer networks curriculum.Developed as an openended exercise in PBL, NiB sets a learning environment in which student teams design and implement a network emulator using off-the-shelf hardware and open-source software. The aims of this article are twofold. The first goal of this article is to catalogue our efforts at San Diego State University in implementing PBL in a computer networks engineering course. The second goal of this article is to introduce the NiB project as a viable example of PBL in the field of computer networks. This project not only arms students with a good understanding of network impairments but also provides the knowledge of low level packet processing, packet creation, packet injection into the network, meeting real time processing requirements of packet processing and packet filtering. By arming students with an understanding of network impairments, a working knowledge of low-level packet processing, packet creation, packet injection, and their processing requirements, NiB serves as a model introduction of PBL into the field of computer networks engineering. In this article we disseminate the product specification and system design as an educational and research utility along with an assessment of this project as perceived by students over several semesters

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Network in a Box: Facilitating problem‐based learning through network emulation

Öztürk

2011

Comp Applic In Engineering

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Performance evaluation of IKEv2 authentication methods in next generation wireless networks

Faigl

Lindskog

Brunström

2009

Security Comm Networks

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Secure communications have a key role in future networks and applications. Information security provisions such as authorization, authentication, and encryption must be added to current communications protocols. To accomplish this, each protocol must be reexamined to determine the impact on performance of adding such security services. This paper presents an experimental evaluation of the performance costs of a wide variety of authentication methods over IKEv2 in real and partly emulated scenarios of next generation wireless networks. The studied methods are pre-shared keys (PSKs), extensible authentication protocol (EAP) using MD5, SIM, TTLS-MD5, TLS, and PEAP-MSCHAPv2. For the EAP-based methods, RADIUS is used as the authentication, authorization, and accounting (AAA) server. Different lengths of certificate chains are studied in case of the TLS-based methods, i.e., TTLS-MD5, TLS, and PEAP-MSCHAPv2. The paper first presents a brief overview of the considered authentication methods. Then, a comparison of the costs for message transfers and computations associated with the authentication methods is provided. The measurement results are verified through a simple analysis, and interpreted by discussing the main contributing factors of the costs. The measurement results illustrate the practical costs involved for IKEv2 authentication, and the implications of the use of different methods are discussed. compose application services. They allow mobile users to engage in all kinds of Internet transactions and services with appropriate trust and security relationship management. One of the main issues on the connectivity level is how to seamlessly integrate the heterogeneous RANs and to realize two major functionalities on top of these networks. The two PERFORMANCE EVALUATION OF IKEv2 AUTHENTICATION METHODS 85 WiFi. The initiator and the responder communicate over an IEEE 802.11g WiFi RAN using IPv6. UMTS. The initiator has native IPv6 access to the responder over an UMTS test network. Far-close. This scenario is an extension of the WiFi scenario. It emulates a situation where the initiator

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SCTP: designed for timely message delivery?

Hurtig

Brunström

2010

Telecommun Syst

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To reduce cost and provide more flexible services, telecommunication operators are currently replacing traditional telephony networks with IP-networks. To support the requirements of telephony signaling in IP-networks, SCTP was standardized. SCTP solves a number of problems that follows from using TCP for telephony signaling transport. However, the design of SCTP is still largely based on TCP, and most of SCTP's data transmission mechanisms are inherited from TCP. Signaling traffic has stricter requirements of timely delivery than TCP bulk traffic. However, such requirements are not supported optimally by the inherited TCP mechanisms. We therefore argue that SCTP is not fully designed for timely message delivery. In this article we present and evaluate two loss recovery adaptations that enhance the timeliness of SCTP: Early Retransmit and a modified RTO management algorithm. In addition, we evaluate an adapted Nagle-like algorithm. The results from our evaluations show a significant reduction of message delivery times. Using our loss recovery enhancements, delivery times were typically reduced with at least 30-50%. Furthermore, in some situations, message delivery times were reduced with up to 70%, using the modified Nagle algorithm. In addition to this, we evaluate all the proposals together under realistic conditions, with very good results.

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KauNet

Cited by 22 publications

References 15 publications

Network in a Box: Facilitating problem‐based learning through network emulation

Network in a Box: Facilitating problem‐based learning through network emulation

Performance evaluation of IKEv2 authentication methods in next generation wireless networks

SCTP: designed for timely message delivery?

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