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Overlay networks is a term for network that run on top of existing infrastructure but provide certain additional functionality. Overlays are created for a number of different reasons. Some overlays are created to provide testbeds for novel protocols and distributed systems that are hard to test on existing networks (for example, multicast and IPv6 experiments). Other overlay networks are used in production to provide features non-existent in the original protocols and infrastructure – for instance, to provide additional security features to transactions done over mainstream TCP and IP protocols that were not designed with security in mind. Another example...
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| Secure Overlay Services | Secure Overlay Services is an overlay network that makes use of several existing crypto and routing techniques to protect communication between the participants against denial of service attacks. Suppose, SOS is set up to protect a server offering information to a number of clients. From a high level, the clients form the overlay using a certaing enrollment procedure, each one keeping a list of some of its overlay neighbors. The server blocks all traffic except that coming from a certain previously chosen overlay member called a secret servlet (with blocking being more effective if done by routers neighboring the...
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| WebSOS | WebSOS is an implementation of the Secure Overlay Services framework. The goal of WebSOS is to protect a web server against denial of service attacks. As a specific implementation of the SOS algorithm, WebSOS access points use a CAPTCHA graphical Turing test, displaying an image with some distorted alpanumeric string, and making the user type the string in a box, to tell between humans and scripts, and to filter out all scripted requests to the target web server, effectively making a DoS attack impossible. After the user's request to the server has been authorized, it is forwarded using the...
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| Mayday | Mayday is an improvement to Columbia SOS work suggested by MIT. While based on similar concepts, the original study provides a more general and solid approach by considering all aspects of an overlay (e.g., a threat model), and generalizing previous work. Unlike multiple duplicate SOS papers that appear to be created just for the sake of a publication, the Mayday work is shorter yet appears to be more fundamental by considering the most important aspects of a DoS-resistant overlay network design step-by-step, and filling in some obvious gaps of previous work (such as a legitimate client attacker, for example)....
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Overlay Networks News:
May 30: Bentley Releases Bentley Water V8 XM Edition - elEconomista.es
May 29: Bentley Releases Bentley Water V8 XM Edition - IT Business Net
May 29: Media spending down, studios cutting back on releases - Hollywood Reporter
May 29: WINSOC project advances the promise of wireless sensor networks - LBS-zone.com (press release)
May 29: 8 Stupid Things Webmasters Do To Mess Up Their Analytics - Marketing Pilgrim
May 29: Bentley Releases Bentley Water V8 XM - Ad-Hoc-News (Pressemitteilung)
May 29: Cisco unveils Cisco Motion - Telecom Paper (subscription)
May 28: Fujitsu and DTC Communications Introduce Metro Ethernet Services ... - WebWire (press release)
May 28: Acme Packet, Inc. Q1 2008 Earnings Call Transcript - Seeking Alpha
May 28: Golden Telecom Selects ECI to Provide Its Metro DWDM/ROADM Network - PR Web (press release)
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