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  • 1.
    Hermansson, Christopher
    et al.
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Johansson, Sebastian
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    IPv6 - Gatewayredundans: Snabbt nog?2011Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Unlike earlier versions of the Internet Protocol, IPv6 have native support for gateway redundancy. By using more than one gateway, Neighbor Unreachability Detection supports automatic switching to a new gateway in the case the active one fails. Before IPv6 you had to rely on external solutions to achieve this kind of redundancy. The main question that is set in the report is if the built-in support for gateway redundancy in IPv6 is fast enough to be used independently, without the use of external solutions. In order to obtain a value about what was “fast enough” we have, by reading previous research about how users experience delay, concluded that a delay must not exceed ten seconds. The report also examines if there are external solutions for gateway redundancy that operates quick enough, and if there are other situations where you might prefer an external solution over Neighbor Unreachability Detection. After a number of experiments we’ve been able to conclude that, according to users, the native support for gateway redundancy in IPv6 is not working fast enough to independently solve the task. Experiments described in the report also shows that an external First Hop Redundancy Protocol has good potential to restore communication fast enough for a user to find the delay acceptable. Furthermore the work confirms that there are situations where you might prefer a First Hop Redundancy Protocol over Neighbor Unreachability Detection.

  • 2.
    Hermansson, Christopher
    et al.
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Johansson, Sebastian
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Segmentering av lokala nätverk - För mikro- och småorganisationer2010Independent thesis Basic level (university diploma), 5 credits / 7,5 HE creditsStudent thesis
    Abstract [en]

    The purpose of this report is to describe a number of approaches that can be used when you are in need of dividing a local area network in a number of segments, and with that also be able to control how data traffic is allowed to traverse between the different segments. The solutions that are presented are focused towards micro and small companies.The reason that we have chosen to work with this matter is that we believe it is important for organizations to have a structured and segmented design of its internal computer network.We have been working by in advance collecting information about various techniques that might solve our problem, and then testing different scenarios using these techniques. Data have been collected after each tested scenario and compiled in statistical form in order to determine which method that was preferable.We have been testing solutions were you segment the network in a layer 2 switch while you allow or deny communication between the segments in a router, and also solutions were you use a layer 3 switch. In that way you can let the routing be performed in the switch, which leads to significantly lower load on the router. The result was that if you are about to segment a local area network it is recommended that you use VLAN and ACL:s, and possibly in combination with a firewall.The final result of this report is that a solution using the “router on a stick”-technique is the cheapest one, and probably the one that most small companies would get along with. However, the solution that you choose depends completely on how much money you want to spend on your network, and also what the needs are.

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