Erhan Lokman

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An algorithm on automatic topology discovery in OpenFlow supported software defined networks is proposed. The proposed algorithm utilizing link layer discovery protocol allows to obtain the whole network topology by the network controller. We have validated the successful operation of our algorithm through simulation and real network tests seperately, and(More)
Future Internet may be comprised of interconnected multiple software-defined networks (SDN), where each domain is administered by a different controller or control plane. Provisioning of an end-to-end flow-path across such a network with specific service levels requires collaboration between domain controllers across control planes. A service-enabled(More)
Increasingly high volume and variety of Internet attacks are encountered every day due to attackers’ strong financial motivation. Most of such malicious activities, such as Spamming, Phishing, Distributed-Denial-of-Service (DDoS), etc., involve numerous compromised computers dispersed over geographically diverse networks. As a result, Internet attackers(More)
Network virtualization is an effective way to overcome the ossification of Internet by enabling multiple virtual networks to coexist on a shared infrastructure. Virtual network embedding is a resource allocation problem concerned with the assignment of physical resources to the virtual networks. Several security issues about virtual network embedding are(More)
Virtual network operators may distrust each other and require that their virtual infrastructure is not cohosted on the same physical equipment. In this paper, we formulate a virtual network embedding problem that maximizes the total revenue where conflicting virtual network operators utilize distinct physical devices. Virtual links in our model have the(More)
Software Defined Networking (SDN) is a paradigm shift that changes the working principals of IP networks by separating the control logic from routers and switches, and logically centralizing it within a controller. While having a centralized controller as a single point of failure creates an added vulnerability from a network security viewpoint, it also(More)
Multi-domain software-defined networks (SDN) require controllers of different domains to be inter-connected to share their available intra-domain paths for inter-domain routing. This specific network of connections, called inter-domain control network, is somewhat similar to a signaling network. Provisioning flow-paths across multiple domains with certain(More)
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