Destructive resilient networks will soon be operational
Engineers commissioned by the military are making persistent attempts to create new network protocols that will guarantee a stable network operation in the most difficult conditions. For example, when each radio node is active for only 20% of the time, and the wireless network configuration is constantly changing. Such a network is almost impossible to destroy.
NetworkWorld magazine has published an article describing various DTN projects (disruption-tolerant networks or delay-tolerant networks), that is, wireless networks that are resistant to destruction and delays. Such projects are funded by the US military agency DARPA. Actually, the original version of the Internet was once created by the order of this agency.
Prospective studies are going in several directions at once. Engineers from BBN Technologies started the second phase of the SPINDLE project, to which DARPA allocated a grant of $ 8.7 million. At the first stage, an experimental network of 20 nodes was created, where each node was active for only 20% of the time, but none the package in such a network is not lost.
Of course, special protocols are required for the operation of DTN networks. In particular, the company BBN already at the first stage of its work developed such a protocol called Bundle, and also described all the equipment and software necessary for the operation of the network. It is assumed that the DTN network will be partially based on the existing network infrastructure, including the well-known Bluetooth, 802.11 and Ethernet protocols. At the second stage, it is planned to develop an API interface so that independent developers can supplement the system with their own code. The working prototype of the system should be ready by the end of 2007.
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Another resilient network is being created at the University of Massachusetts. Their pilot project is called DieselNet and provides for the installation of 40 wireless communication nodes on city buses. The equipment is mounted directly above the driver’s seat ( photo ), it includes a computer, a power supply unit, an 802.11b access point and a GPS receiver.
If two buses in the DieselNet network pass by each other, they quickly log in and exchange packets, as well as information about the current coordinates of other network nodes, in order to update the packet routing table. As the statistics show, one communication session usually lasts from three to ten seconds, the maximum is a minute, and the average data transfer rate is 64-128 KB / s.
In the DieselNet network, engineers are now experimenting with the creation of an additional “backbone” from stationary router nodes that are mounted on the roofs of buildings as the buses go ( photo ). These radio points must receive information from some buses and transmit it to others. It is assumed that through these points will be connected with the Internet. Thus, bus passengers can even go online, but only the response time during surfing can be measured in minutes.
In general, routing packets in a DTN network is not a trivial task. For example, the routing protocol here provides that a node sends a packet further across the network even if the destination of this packet does not exist. Information is simply transmitted to other devices in the access zone, and they transmit it even further. This is a very original approach that allows you to reduce packet loss to 0%.
NetworkWorld magazine has published an article describing various DTN projects (disruption-tolerant networks or delay-tolerant networks), that is, wireless networks that are resistant to destruction and delays. Such projects are funded by the US military agency DARPA. Actually, the original version of the Internet was once created by the order of this agency.
Prospective studies are going in several directions at once. Engineers from BBN Technologies started the second phase of the SPINDLE project, to which DARPA allocated a grant of $ 8.7 million. At the first stage, an experimental network of 20 nodes was created, where each node was active for only 20% of the time, but none the package in such a network is not lost.
Of course, special protocols are required for the operation of DTN networks. In particular, the company BBN already at the first stage of its work developed such a protocol called Bundle, and also described all the equipment and software necessary for the operation of the network. It is assumed that the DTN network will be partially based on the existing network infrastructure, including the well-known Bluetooth, 802.11 and Ethernet protocols. At the second stage, it is planned to develop an API interface so that independent developers can supplement the system with their own code. The working prototype of the system should be ready by the end of 2007.
')
Another resilient network is being created at the University of Massachusetts. Their pilot project is called DieselNet and provides for the installation of 40 wireless communication nodes on city buses. The equipment is mounted directly above the driver’s seat ( photo ), it includes a computer, a power supply unit, an 802.11b access point and a GPS receiver.
If two buses in the DieselNet network pass by each other, they quickly log in and exchange packets, as well as information about the current coordinates of other network nodes, in order to update the packet routing table. As the statistics show, one communication session usually lasts from three to ten seconds, the maximum is a minute, and the average data transfer rate is 64-128 KB / s.
In the DieselNet network, engineers are now experimenting with the creation of an additional “backbone” from stationary router nodes that are mounted on the roofs of buildings as the buses go ( photo ). These radio points must receive information from some buses and transmit it to others. It is assumed that through these points will be connected with the Internet. Thus, bus passengers can even go online, but only the response time during surfing can be measured in minutes.
In general, routing packets in a DTN network is not a trivial task. For example, the routing protocol here provides that a node sends a packet further across the network even if the destination of this packet does not exist. Information is simply transmitted to other devices in the access zone, and they transmit it even further. This is a very original approach that allows you to reduce packet loss to 0%.
Source: https://habr.com/ru/post/4695/
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