As we increase our dependency upon networked communication, the incentive to compromise and degrade network performance rises for those who disrupt information flow. Attacks that cause loss of network performance can come in various types, including but not limited to distributed denial of service (DDoS) attacks, cutting wires, jamming transmissions, and eavesdropping. Users can safeguard themselves from monitoring by applying cryptographic techniques.
Ongoing advances in communication networks continue to change our ability to “keep in touch dramatically.” Cell phones, pagers, and wireless handheld devices will soon allow people to communicate regardless of their respective locations and via several different means, including voice, video, and text. Also, the Internet is used for increasingly time-critical applications like electricity production monitoring and coordination between other generators. There is a growing need for the network to offer high, predictable levels of service. Due to the anornimous number of hosts that are compromised (also known as bots) used in the source of DDOS attack can be difficult. Techniques to prevent DDoS attacks or mitigate the effect of such attacks while raging on should be in practice.
Overlay networking (aka SDN overlay) uses software to create layers of network abstraction used to run multiple separate, discrete virtualized network layers on top of the physical network, often providing new applications or security benefits. An overlay network aims to enable a new service or function without reconfiguring the entire network design.
Overlays and protocols
Overlay networking can include peer-to-peer networks, IP networks, and virtual local area networks (VLANs). The Internet itself, which uses Layer 3 IP addressing, also uses overlay networking. IP addresses is used to define locations by the internet. This method, also referred to as “Layer 3 networking,” means that the IP addresses can either be static — attached to a permanent physical device.
Using a secure overlay network enables an enterprise to bypass risks like these. The network traffic is encrypted before it reaches the first WAN router and decrypts only by the remote location’s intended devices. Various network protocols and standards have been developed for overlay networks. Among these protocols include IP, virtual extensible LAN (VXLAN), generic routing encapsulation, network virtualization overlays 3 (NVO3), and IP multicast. The introduction of a software-defined network (SDN), which involves separating of forwarding plane from the network control panel, has also produced overlay technologies like VMWare’s NSX.
Advantages with Overlay Network
Flexibility: Overlays network improves the performance and robustness of unicast routing by providing alternate paths from a particular source to a specific destination along paths that proceeded through intermediate end-systems. IT managers can move virtual machines to different locations without being restricted by the physical network.
Robustness: Since overlays increase a network’s robustness, attackers will have a more difficult time bringing down the network. This will intern help organizations manage threat assessment and cybersecurity framework.
Dynamics: Since participants of the overlay come and go, there is a more significant challenge in even deciding what to attack.
Increased Alternatives: Usually network routing provides a single path between two points. On the other hand, an almost limitless set of paths between two paths is provided while using overlay routing. Thus, an attacker that wishes to bring down a particular communication must be prepared to attack a much more significant portion of the network when overlays are used.
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