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- pandoc -f markdown_mmd --pdf-engine=weasyprint -c themes/basic/static/css/print.css $< -o $@
+ pandoc -f markdown -t html -c themes/basic/static/css/print.css $< -o $@.html
+ pandoc --pdf-engine=weasyprint -c themes/basic/static/css/print.css $< -o $@
print: $(md2pdf)
+ $(shell mv content/Essays/*.html content/print/)
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diff --git a/content/Essays/Kris_De_Decker-how_to_build_a_low_tech_internet.md b/content/Essays/Kris_De_Decker-how_to_build_a_low_tech_internet.md
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+### How to Build a Low-tech Internet
+
+Wireless internet access is on the rise in both modern consumer
+societies and in the developing world.
+
+In rich countries, however, the focus is on always-on connectivity and
+ever higher access speeds. In poor countries, on the other hand,
+connectivity is achieved through much more low-tech, often asynchronous
+networks.
+
+While the high-tech approach pushes the costs and energy use of the
+internet [higher and
+higher](https://www.lowtechmagazine.com/2015/10/can-the-internet-run-on-renewable-energy.html),
+the low-tech alternatives result in much cheaper and very energy
+efficient networks that combine well with renewable power production and
+are resistant to disruptions.
+
+If we want the internet to keep working in circumstances where access to
+energy is more limited, we can learn important lessons from alternative
+network technologies. Best of all, there\'s no need to wait for
+governments or companies to facilitate: we can build our own resilient
+communication infrastructure if we cooperate with one another. This is
+demonstrated by several community networks in Europe, of which the
+largest has more than 35,000 users already.
+
+[]{#anchor}Picture: A node in the [Scottish Tegola
+Network](http://www.tegola.org.uk/hebnet/).
+
+More than half of the global population does not have access to the
+\"worldwide\" web. Up to now, the internet is mainly an urban
+phenomenon, especially in \"developing\" countries. Telecommunication
+companies are usually reluctant to extend their network outside cities
+due to a combination of high infrastructure costs, low population
+density, limited ability to pay for services, and an unreliable or
+non-existent electricity infrastructure. Even in remote regions of
+\"developed\" countries, internet connectivity isn\'t always available.
+
+Internet companies such as Facebook and Google regularly make headlines
+with plans for connecting these remote regions to the internet. Facebook
+tries to achieve this with drones, while Google counts on high-altitude
+balloons. There are major technological challenges, but the main
+objection to these plans is their commercial character. Obviously,
+Google and Facebook want to connect more people to the internet because
+that would increase their revenues. Facebook especially receives lots of
+criticism because their network promotes their own site in particular,
+and blocks most other internet applications. \[1\]
+
+Meanwhile, several research groups and network enthusiasts have
+developed and implemented much cheaper alternative network technologies
+to solve these issues. Although these low-tech networks have proven
+their worth, they have received much less attention. Contrary to the
+projects of internet companies, they are set up by small organisations
+or by the users themselves. This guarantees an open network that
+benefits the users instead of a handful of corporations. At the same
+time, these low-tech networks are very energy efficient.
+
+****WiFi-based Long Distance Networks****
+
+Most low-tech networks are based on WiFi, the same technology that
+allows mobile access to the internet in most western households. As we
+have seen in the previous article, [sharing these devices could provide
+free mobile access across densely populated
+cities](https://www.lowtechmagazine.com/2015/10/the-4g-network-thats-already-there.html).
+But the technology can be equally useful in sparsely populated areas.
+Although the WiFi-standard was developed for short-distance data
+communication (with a typical range of about 30 metres), its reach can
+be extended through modifications of the Media Access Control (MAC)
+layer in the networking protocol, and through the use of range extender
+amplifiers and directional antennas. \[2\]
+
+Although the WiFi-standard was developed for short-distance data
+communication, its reach can be extended to cover distances of more than
+100 kilometres.
+
+The longest unamplified WiFi link is a 384 km wireless point-to-point
+connection between Pico El Águila and Platillón in Venezuela,
+established a few years ago. \[3,4\] However, WiFi-based long distance
+networks usually consist of a combination of shorter point-to-point
+links, each between a few kilometres and one hundred kilometers long at
+most. These are combined to create larger, multihop networks.
+Point-to-points links, which form the backbone of a long range WiFi
+network, are combined with omnidirectional antennas that distribute the
+signal to individual households (or public institutions) of a community.
+
+Picture: A relay with three point-to-point links and three sectoral
+antennae.
+[Tegola](http://www.tegola.org.uk/howto/network-planning.html).
+
+Long-distance WiFi links require line of sight to make a connection \--
+in this sense, the technology resembles the [18th century optical
+telegraph](https://www.lowtechmagazine.com/2007/12/email-in-the-18.html).
+\[5\] If there\'s no line of sight between two points, a third relay is
+required that can see both points, and the signal is sent to the
+intermediate relay first. Depending on the terrain and particular
+obstacles, more hubs may be necessary. \[6\]
+
+Point-to-point links typically consist of two directional antennas, one
+focused on the next node and the other on the previous node in the
+network. Nodes can have multiple antennas with one antenna per fixed
+point-to-point link to each neighbour. \[7\] This allows mesh routing
+protocols that can dynamically select which links to choose for routing
+among the available ones. \[8\]
+
+Long-distance WiFi links require line of sight to make a connection \--
+in this sense, the technology resembles the 18th century optical
+telegraph.
+
+Distribution nodes usually consist of a sectoral antenna (a small
+version of the things you see on mobile phone masts) or a conventional
+WiFi-router, together with a number of receivers in the community. \[6\]
+For short distance WiFi-communication, there is no requirement for line
+of sight between the transmitter and the receiver. \[9\]
+
+To provide users with access to the worldwide internet, a long range
+WiFi network should be connected to the main backbone of the internet
+using at least one \"backhaul\" or \"gateway node\". This can be a
+dial-up or broadband connection (DSL, fibre or satellite). If such a
+link is not established, users would still be able to communicate with
+each other and view websites set up on local servers, but they would not
+be able to access the internet. \[10\]
+
+****Advantages of Long Range WiFi****
+
+Long range WiFi offers high bandwidth (up to 54 Mbps) combined with very
+low capital costs. Because the WiFi standard enjoys widespread
+acceptance and has huge production volumes, off-the-shelf antennas and
+wireless cards can be bought for very little money. \[11\]
+Alternatively, components can be put together [from discarded
+materials](http://roelof.info/projects/%282014%29Pretty_Fly_For_A_Wifi/)
+such as old routers, satellite dish antennas and laptops. Protocols like
+WiLDNet run on a 266 Mhz processor with only 128 MB memory, so an old
+computer will do the trick. \[7\]
+
+The WiFi-nodes are lightweight and don\'t need expensive towers \--
+further decreasing capital costs, and minimizing the impact of the
+structures to be built. \[7\] More recently, single units that combine
+antenna, wireless card and processor have become available. These are
+very convenient for installation. To build a relay, one simply connects
+such units together with ethernet cables that carry both signal and
+power. \[6\] The units can be mounted in towers or slim masts, given
+that they offer little windload. \[3\] Examples of suppliers of long
+range WiFi components are [Ubiquity](https://www.ubnt.com/),
+[Alvarion](http://www.alvarion.com/) and
+[MikroTik](http://www.mikrotik.com/), and
+[simpleWiFi](https://www.simplewifi.com/).
+
+Long Range WiFi makes use of unlicensed spectrum and offers high
+bandwidth, low capital costs, easy installation, and low power
+requirements.
+
+Long range WiFi also has low operational costs due to low power
+requirements. A typical mast installation consisting of two long
+distance links and one or two wireless cards for local distribution
+consumes around 30 watts. \[6,12\] In several low-tech networks, nodes
+are entirely powered by solar panels and batteries. Another important
+advantage of long range WiFi is that it makes use of unlicensed spectrum
+(2.4 and 5 GHz), and thus avoids negotiations with telecom operators and
+government. This adds to the cost advantage and allows basically anyone
+to start a WiFi-based long distance network. \[9\]
+
+****Long Range WiFi Networks in Poor Countries****
+
+The first long range WiFi networks were set up ten to fifteen years ago.
+In poor countries, two main types have been built. The first is aimed at
+providing internet access to people in remote villages. An example is
+the Akshaya network in India, which covers the entire Kerala State and
+is one of the largest wireless networks in the world. The infrastructure
+is built around approximately 2,500 \"computer access centers\", which
+are open to the local population \-- direct ownership of computers is
+minimal in the region. \[13\]
+
+Another example, also in India, are the AirJaldi networks which provide
+internet access to approximately 20,000 users in six states, all in
+remote regions and on difficult terrain. Most nodes in this network are
+solar-powered and the distance between them can range up to 50 km or
+more. \[14\] In some African countries, local WiFi-networks distribute
+internet access from a satellite gateway. \[15,16\]
+
+A node in the AirJaldi network. Picture: AirJaldi.
+
+A second type of long distance WiFi network in poor countries is aimed
+at providing telemedicine to remote communities. In remote regions,
+health care is often provided through health posts scarcely equipped and
+attended by health technicians who are barely trained. \[17\] Long-range
+WiFi networks can connect urban hospitals with these outlying health
+posts, allowing doctors to remotely support health technicians using
+high-resolution file transfers and real-time communication tools based
+on voice and video.
+
+An example is the link between Cabo Pantoja and Iquitos in the Loreto
+province in Peru, which was established in 2007. The 450 km network
+consists of 17 towers which are 16 to 50 km apart. The line connects 15
+medical outposts in remote villages with the main hospital in Iquitos
+and is aimed at remote diagnosis of patients. \[17,18\] All equipment is
+powered by solar panels. \[18,19\] Other succesful examples of long
+range WiFi telemedicine networks have been built in India, Malawi and
+Ghana. \[20,21\]
+
+****WiFi-Based Community Networks in Europe****
+
+The low-tech networks in poor countries are set up by NGO\'s,
+governments, universities or businesses. In contrast, most of the
+WiFi-based long distance networks in remote regions of rich countries
+are so-called \"community networks\": the users themselves build, own,
+power and maintain the infrastructure. Similar to the shared wireless
+approach in cities, reciprocal resource sharing forms the basis of these
+networks: participants can set up their own node and connect to the
+network (for free), as long as their node also allows traffic of other
+members. Each node acts as a WiFi routing device that provides IP
+forwarding services and a data link to all users and nodes connected to
+it. \[8,22\]
+
+In a community network, the users themselves build, own, power and
+maintain the infrastructure.
+
+Consequently, with each new user, the network becomes larger. There is
+no a-priori overall planning. A community network grows bottom-up,
+driven by the needs of its users, as nodes and links are added or
+upgraded following demand patterns. The only consideration is to connect
+a node from a new participant to an existing one. As a node is powered
+on, it discovers it neighbours, attributes itself a unique IP adress,
+and then establishes the most appropriate routes to the rest of the
+network, taking into account the quality of the links. Community
+networks are open to participation to everyone, sometimes according to
+an open peering agreement. \[8,9,19,22\]
+
+Wireless links in the Spanish Guifi network.
+[Credit](https://iuliinet.github.io/presentazione_ottobre_2014/img/barcellona.jpg).
+
+Despite the lack of reliable statistics, community networks seem to be
+rather succesful, and there are several large ones in Europe, such as
+[Guifi.net](https://guifi.net/) (Spain), [Athens Wireless Metropolitan
+Network](http://www.awmn.gr/content.php?s=ce506a41ab245641d6934638c6f6f107)
+(Greece), [FunkFeuer](http://www.funkfeuer.at/) (Austria), and
+[Freifunk](https://freifunk.net/en/) (Germany). \[8,22,23,24\] The
+Spanish network is the largest WiFi-based long distance network in the
+world with more than 50,000 kilometres of links, although a small part
+is based on optic fibre links. Most of it is located in the Catalan
+Pyrenees, one of the least populated areas in Spain. The network was
+initiated in 2004 and now has close to 30,000 nodes, up from 17,000 in
+2012. \[8,22\]
+
+Guifi.net provides internet access to individuals, companies,
+administrations and universities. In principle, the network is
+installed, powered and maintained by its users, although volunteer teams
+and even commercial installers are present to help. Some nodes and
+backbone upgrades have been succesfully crowdfunded by indirect
+beneficiaries of the network. \[8,22\]
+
+****Performance of Low-tech Networks****
+
+So how about the performance of low-tech networks? What can you do with
+them? The available bandwidth per user can vary enormously, depending on
+the bandwidth of the gateway node(s) and the number of users, among
+other factors. The long-distance WiFi networks aimed at telemedicine in
+poor countries have few users and a good backhaul, resulting in high
+bandwidth (+ 40 Mbps). This gives them a similar performance to fibre
+connections in the developed world. A study of (a small part of) the
+Guifi.net community network, which has dozens of gateway nodes and
+thousands of users, showed an average throughput of 2 Mbps, which is
+comparable to a relatively slow DSL connection. Actual throughput per
+user varies from 700 kbps to 8 Mbps. \[25\]
+
+The available bandwidth per user can vary enormously, depending on the
+bandwidth of the gateway node(s) and the number of users, among other
+factors
+
+However, the low-tech networks that distribute internet access to a
+large user base in developing countries can have much more limited
+bandwidth per user. For example, a university campus in Kerala (India)
+uses a 750 kbps internet connection that is shared across 3,000 faculty
+members and students operating from 400 machines, where during peak
+hours nearly every machine is being used.
+
+Therefore, the worst-case average bandwidth available per machine is
+approximately 1.9 kbps, which is slow even in comparison to a dial-up
+connection (56 kbps). And this can be considered a really good
+connectivity compared to typical rural settings in poor countries.
+\[26\] To make matters worse, such networks often have to deal with an
+intermittent power supply.
+
+Under these circumstances, even the most common internet applications
+have poor performance, or don\'t work at all. The communication model of
+the internet is based on a set of network assumptions, called the TCP/IP
+protocol suite. These include the existence of a bi-directional
+end-to-end path between the source (for example a website\'s server) and
+the destination (the user\'s computer), short round-trip delays, and low
+error rates.
+
+Many low-tech networks in poor countries do not comform to these
+assumptions. They are characterized by intermittent connectivity or
+\"network partitioning\" \-- the absence of an end-to-end path between
+source and destination \-- long and variable delays, and high error
+rates. \[21,27,28\]
+
+****Delay-Tolerant Networks****
+
+Nevertheless, even in such conditions, the internet could work perfectly
+fine. The technical issues can be solved by moving away from the
+always-on model of traditional networks, and instead design networks
+based upon asynchronous communication and intermittent connectivity.
+These so-called \"delay-tolerant networks\" (DTNs) have their own
+specialized protocols overlayed on top of the lower protocols and do not
+utilize TCP. They overcome the problems of intermittent connectivity and
+long delays by using store-and-forward message switching.
+
+Information is forwarded from a storage place on one node to a storage
+place on another node, along a path that *eventually* reaches its
+destination. In contrast to traditional internet routers, which only
+store incoming packets for a few milliseconds on memory chips, the nodes
+of a delay-tolerant network have persistent storage (such as hard disks)
+that can hold information indefinitely. \[27,28\]
+
+Delay-tolerant networks combine well with renewable energy: solar panels
+or wind turbines could power network nodes only when the sun shines or
+the wind blows, eliminating the need for energy storage.
+
+Delay-tolerant networks don\'t require an end-to-end path between source
+and destination. Data is simply transferred from node to node. If the
+next node is unavailable because of long delays or a power outage, the
+data is stored on the hard disk until the node becomes available again.
+While it might take a long time for data to travel from source to
+destination, a delay-tolerant network ensures that it will eventually
+arrive.
+
+Delay-tolerant networks further decrease capital costs and energy use,
+leading to the most efficient use of scarce resources. They keep working
+with an intermittent energy supply and they combine well with renewable
+energy sources: solar panels or wind turbines could power network nodes
+only when the sun shines or the wind blows, eliminating the need for
+energy storage.
+
+****Data Mules****
+
+Delay-tolerant networking can take surprising forms, especially when
+they take advantage of some non-traditional means of communication, such
+as \"data mules\". \[11,29\] In such networks, conventional
+transportation technologies \-- buses, cars, motorcycles, trains, boats,
+airplanes \-- are used to ferry messages from one location to another in
+a store-and-forward manner.
+
+Examples are DakNet and KioskNet, which use buses as data mules.
+\[30-34\] In many developing regions, rural bus routes regularly visit
+villages and towns that have no network connectivity. By equipping each
+vehicle with a computer, a storage device and a mobile WiFi-node on the
+one hand, and by installing a stationary WiFi-node in each village on
+the other hand, the local transport infrastructure can substitute for a
+wireless internet link. \[11\]
+
+Picture: AirJaldi.
+
+Outgoing data (such as sent emails or requests for webpages) is stored
+on local computers in the village until the bus comes withing range. At
+this point, the fixed WiFi-node of the local computer automatically
+transmits the data to the mobile WiFi-node of the bus. Later, when the
+bus arrives at a hub that is connected to the internet, the outgoing
+data is transmitted from the mobile WiFi-node to the gateway node, and
+then to the internet. Data sent to the village takes the opposite route.
+The bus \-- or data \-- driver doesn\'t require any special skills and
+is completely oblivious to the data transfers taking place. He or she
+does not need to do anything other than come in range of the nodes.
+\[30,31\]
+
+In a data mules network, the local transport infrastructure substitutes
+for a wireless internet link.
+
+The use of data mules offers some extra advantages over more
+\"sophisticated\" delay-tolerant networks. A \"drive-by\" WiFi network
+allows for small, low-cost and low-power radio devices to be used, which
+don\'t require line of sight and consequently no towers \-- further
+lowering capital costs and energy use compared to other low-tech
+networks. \[30,31,32\]
+
+The use of short-distance WiFi-links also results in a higher bandwidth
+compared to long-distance WiFi-links, which makes data mules better
+suited to transfer larger files. On average, 20 MB of data can be moved
+in each direction when a bus passes a fixed WiFi-node. \[30,32\] On the
+other hand, latency (the time interval between sending and receiving
+data) is usually higher than on long-range WiFi-links. A single bus
+passing by a village once a day gives a latency of 24 hours.
+
+****Delay-Tolerant Software****
+
+Obviously, a delay-tolerant network (DTN) \-- whatever its form \-- also
+requires new software: applications that function without a connected
+end-to-end networking path. \[11\] Such custom applications are also
+useful for synchronous, low bandwidth networks. Email is relatively easy
+to adapt to intermittent connectivity, because it\'s an asynchronous
+communication method by itself. A DTN-enabled email client stores
+outgoing messages until a connection is available. Although emails may
+take longer to reach their destination, the user experience doesn\'t
+really change.
+
+A Freifunk WiFi-node is installed in Berlin, Germany. Picture:[
+Wikipedia
+Commons](https://upload.wikimedia.org/wikipedia/commons/5/51/Freifunk-Initiative_in_Berlin-Kreuzberg.jpg).
+
+Browsing and searching the web requires more adaptations. For example,
+most search engines optimize for speed, assuming that a user can quickly
+look through the returned links and immediately run a second modified
+search if the first result is inadequate. However, in intermittent
+networks, multiple rounds of interactive search would be impractical.
+\[26,35\] Asynchronous search engines optimize for bandwith rather than
+response time. \[26,30,31,35,36\] For example, RuralCafe desynchronizes
+the search process by performing many search tasks in an offline manner,
+refining the search request based on a database of similar searches. The
+actual retrieval of information using the network is only done when
+absolutely necessary.
+
+Many internet applications could be adapted to intermittent networks,
+such as webbrowsing, email, electronic form filling, interaction with
+e-commerce sites, blogsoftware, large file downloads, or social media.
+
+Some DTN-enabled browsers download not only the explicitly requested
+webpages but also the pages that are linked to by the requested pages.
+\[30\] Others are optimized to return low-bandwidth results, which are
+achieved by filtering, analysis, and compression on the server site. A
+similar effect can be achieved through the use of a service like
+[Loband](http://www.loband.org/loband/), which strips webpages of
+images, video, advertisements, social media buttons, and so on, merely
+presenting the textual content. \[26\]
+
+Browsing and searching on intermittent networks can also be improved by
+local caching (storing already downloaded pages) and prefetching
+(downloading pages that might be retrieved in the future). \[206\] Many
+other internet applications could also be adapted to intermittent
+networks, such as electronic form filling, interaction with e-commerce
+sites, blogsoftware, large file downloads, social media, and so on.
+\[11,30\] All these applications would remain possible, though at lower
+speeds.
+
+****Sneakernets****
+
+Obviously, real-time applications such as internet telephony, media
+streaming, chatting or videoconferencing are impossible to adapt to
+intermittent networks, which provide only asynchronous communication.
+These applications are also difficult to run on synchronous networks
+that have limited bandwidth. Because these are the applications that are
+in large part responsible for the growing energy use of the internet,
+one could argue that their incompatibility with low-tech networks is
+actually a good thing (see the [previous
+article](https://www.lowtechmagazine.com/2015/10/can-the-internet-run-on-renewable-energy.html)).
+
+Furthermore, many of these applications could be organized in different
+ways. While real-time voice or video conversations won\'t work, it\'s
+perfectly possible to send and receive voice or video messages. And
+while streaming media can\'t happen, downloading music albums and video
+remains possible. Moreover, these files could be \"transmitted\" by the
+most low-tech internet technology available: a sneakernet. In a
+sneakernet, digital data is \"wirelessly\" transmitted using a storage
+medium such as a hard disk, a USB-key, a flash card, or a CD or DVD.
+Before the arrival of the internet, all computer files were exchanged
+via a sneakernet, using tape or floppy disks as a storage medium.
+
+Stuffing a cargo train full of digital storage media would beat any
+digital network in terms of speed, cost and energy efficiency. Picture:
+Wikipedia Commons.
+
+Just like a data mules network, a sneakernet involves a vehicle, a
+messenger on foot, or an animal (such as a [carrier
+pigeon](https://www.lowtechmagazine.com/2009/02/sneakernet-beats-internet.html)).
+However, in a sneakernet there is no automatic data transfer between the
+mobile node (for instance, a vehicle) and the stationary nodes (sender
+and recipient). Instead, the data first have to be transferred from the
+sender\'s computer to a portable storage medium. Then, upon arrival, the
+data have to be transferred from the portable storage medium to the
+receiver\'s computer. \[30\] A sneakernet thus requires manual
+intervention and this makes it less convenient for many internet
+applications.
+
+There are exceptions, though. For example, a movie doesn\'t have to be
+transferred to the hard disk of your computer in order to watch it. You
+play it straight from a portable hard disk or slide a disc into the
+DVD-player. Moreover, a sneakernet also offers an important advantage:
+of all low-tech networks, it has the most bandwidth available. This
+makes it perfectly suited for the distribution of large files such as
+movies or computer games. In fact, when very large files are involved, a
+sneakernet even beats the fastest fibre internet connection. At lower
+internet speeds, sneakernets can be advantageous for much smaller files.
+
+Technological progress will not lower the advantage of a sneakernet.
+Digital storage media evolve at least as fast as internet connections
+and they both improve communication in an equal way.
+
+****Resilient Networks****
+
+While most low-tech networks are aimed at regions where the alternative
+is often no internet connection at all, their usefulness for
+well-connected areas cannot be overlooked. The internet as we know it in
+the industrialized world is a product of an abundant energy supply, a
+robust electricity infrastructure, and sustained economic growth. This
+\"high-tech\" internet might offer some fancy advantages over the
+low-tech networks, but it cannot survive if these conditions change.
+This makes it extremely vulnerable.
+
+The internet as we know it in the industrialized world is a product of
+an abundant energy supply, a robust electricity infrastructure, and
+sustained economic growth. It cannot survive if these conditions change.
+
+Depending on their level of resilience, low-tech networks can remain in
+operation when the supply of fossil fuels is interrupted, when the
+electricity infrastructure deteriorates, when the economy grinds to a
+halt, or if other calamities should hit. Such a low-tech internet would
+allow us to surf the web, send and receive e-mails, shop online, share
+content, and so on. Meanwhile, data mules and sneakernets could serve to
+handle the distribution of large files such as videos. Stuffing a cargo
+vessel or a train full of digital storage media would beat any digital
+network in terms of speed, cost and energy efficiency. And if such a
+transport infrastructure would no longer be available, we could still
+rely on messengers on foot, [cargo
+bikes](https://www.lowtechmagazine.com/2014/05/modular-cargo-cycles.html)
+and [sailing vessels](https://www.lowtechmagazine.com/sailing-ships/).
+
+Such a hybrid system of online and offline applications would remain a
+very powerful communication network \-- unlike anything we had even in
+the late twentieth century. Even if we envision a doom scenario in which
+the wider internet infrastructure would disintegrate, isolated low-tech
+networks would still be very useful local and regional communication
+technologies. Furthermore, they could obtain content from other remote
+networks through the exchange of portable storage media. The internet,
+it appears, can be as low-tech or high-tech as we can afford it to be.
+
+Kris De Decker (edited by [Jenna
+Collett](https://www.linkedin.com/pub/jenna-collett/1a/925/b3))
+
+This article has been translated into
+[Spanish](https://solar.lowtechmagazine.com/es/2015/10/how-to-build-a-low-tech-internet.html).
+
+****Sources & Notes:****
+
+DIY: [Wireless networking in the developing
+world](http://wndw.net/book.html#readBook) (Third Edition) is a free
+book about designing, implementing and maintaining low-cost wireless
+networks. Available in English, French, and Spanish.
+
+\[1\] [Connecting the unwired world with balloons, satellites, lasers &
+drones](https://tech.slashdot.org/story/15/09/03/214256/connecting-the-unwired-world-with-balloons-satellites-lasers-drones),
+Slashdot, 2015
+
+\[2\] [A QoS-aware dynamic bandwidth allocation scheme for multi-hop
+WiFi-based long distance
+networks](https://link.springer.com/article/10.1186%2Fs13638-015-0352-z#/page-1),
+Iftekhar Hussain et al., 2015
+
+\[3\] [Long-distance, Low-Cost Wireless Data
+Transmission](http://www.ursi.org/files/RSBissues/RSB_339_2011_12.pdf)
+(PDF), Ermanno Pietrosemoli, 2011
+
+\[4\] This link could only be established thanks to the height of the
+endpoints (4,200 and 1,500 km) and the flatness of the middle ground.
+The curvature of the Earth makes longer point-to-point WiFi-links
+difficult to achieve because line of sight between two points is
+required.
+
+\[5\] Radio waves occupy a volume around the optical line, which must be
+unemcumbered from obstacles. This volume is known as the Fresnel
+ellipsoid and its size grows with the distance between the two end
+points and with the wavelength of the signal, which is in turn inversely
+proportional to the frequency. Thus, it is required to leave extra
+\"elbow room\" for the Fresnel zone. \[9\]
+
+\[6\] [A Brief History of the Tegola
+Project](http://www.tegola.org.uk/tegola-history.html), Tegola Project,
+retrieved October 2015
+
+\[7\] [WiLDNet: Design and Implementation of High Performance WiFi based
+Long Distance
+Networks](http://tier.cs.berkeley.edu/docs/wireless/wild_multihop.pdf)
+(PDF), Rabin Patra et al., 2007
+
+\[8\] [Topology Patterns of a Community Network:
+Guifi.net](http://dsg.ac.upc.edu/sites/default/files/1569633605.pdf)
+(PDF), Davide Vega et al., 2012
+
+\[9\] [Global Access to the Internet for All, internet
+draft](https://trac.tools.ietf.org/group/irtf/trac/wiki/gaia), Internet
+Engineering Task Force (IETF), 2015
+
+\[10\] This is what happened to Afghanistan\'s JLINK network when
+[funding for the network\'s satellite link ran dry in
+2012](https://www.wired.com/2012/05/jlink/).
+
+\[11\] [The case for technology in developing
+regions](https://www.cs.cmu.edu/~mattkam/lab/publications/Computer2005.pdf)
+(PDF), Eric Brewer et al., 2005
+
+\[12\] [Beyond Pilots: Keeping Rural Wireless Networks
+Alive](https://www.usenix.org/legacy/event/nsdi08/tech/full_papers/surana/surana.pdf)
+(PDF), Sonesh Surana et al., 2008
+
+\[13\]
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This month an undergraduate student told me his parents were using the -pandemic to persuade him to avoid philosophy as it could not prevent or -solve real emergencies. I told him to let them know that we find -ourselves in this global emergency because we haven't thought -philosophically *enough*. The increasingly narrow focus of experts this -century has prevented us from addressing problems from a global -perspective, which has always been the distinctive approach of -philosophy. This is evident in the little consideration we give to -warnings. Too often these are discarded as useless or -insignificant---much like philosophy---when in fact they are vital. -Though philosophers can't solve an ongoing emergency---philosophy was -never meant to solve anything---we can interpret their signs through a -"philosophy of warnings." Although this philosophy probably won't change -the views of my student's parents, it might help us to reevaluate our -political, environmental, and technological priorities for the future.
- -Like recent philosophies of plants or -[[insects]{.underline}](http://cup.columbia.edu/book/a-philosophy-of-the-insect/9780231175791), -which emerged as a response to a global environmental crisis, a -"philosophy of warnings" is also a reaction to a global emergency that -requires philosophical elucidation. Although the ongoing pandemic has -triggered this new stance it isn't limited to this event. Nor is it -completely new. Warnings have been a topic of philosophical -investigation for centuries. The difference lies in the meaning these -concepts have acquired now. Before philosophy we had prophets to tell us -to be alert to the warnings of the Gods, but we secularized that office -into that of the philosopher, who, as one among equals, advised to heed -the signs; to use our imagination, because that is all we got. The -current pandemic has shown how little prepared we were for a global -emergency, even one whose coming has been -[[announced]{.underline}](https://www.nationalgeographic.com/science/2020/04/experts-warned-pandemic-decades-ago-why-not-ready-for-coronavirus/) -for decades. But why haven't we been able to take these warnings -seriously? Before tackling this question, let's recall how warnings have -been addressed philosophically.
- -Examples of warning philosophy can be traced back to Greek mythology and -Plato\'s *Apology*. Apollo provided Cassandra with the gift of prophecy -even though she could not convince others of the validity of her -predictions, and Socrates warned the Athenians---after he was sentenced -to death---that their inequity and mendacity undermined the democracy -they claimed to honor. Against Gaston Bachelard, who coined the term -"Cassandra complex" to refer to the idea that events could be known in -advance, Theodore Adorno warned that any claim to know the future should -be avoided. It is probably in this spirit that Walter Benjamin warned we -should pull the brake on the train of progress as it was stacking -disaster upon disaster. In line with Hannah Arendt's warnings of the -reemergence of totalitarianism after the Second World War, Giorgio -Agamben began his book on the current pandemic with "A Warning": -biosecurity will now serve governments to rule through a new form of -tyranny called "technological-sanitary" despotism.
- -These examples illustrate the difference between warnings and -predictions. Warnings are sustained by signs in the present that request -our involvement, as Benjamin suggests. Predictions call out what will -take place regardless of our actions, a future as the only continuation -of the present, but warnings instead point toward what is to come and -are meant involve us in a radical break, a discontinuity with the -present signaled by alarming signs that we are asked to confront. The -problem is not the involvement warnings request from us but rather -whether we are willing to confront them at all. The volume of vital -warnings that we ignore---climate change, social inequality, refugee -crises---is alarming; it has become our greatest emergency.
- -Indifference towards warnings is rooted in the ongoing global return to -order and realism in the twenty-first century. This return is not only -political, as demonstrated by the various right-wing populist forces -that have taken office around the world, but also cultural as the return -of some contemporary -[[intellectuals]{.underline}](https://arcade.stanford.edu/blogs/returning-order-through-realism) -to Eurocentric Cartesian realism demonstrates. The idea that we can -still claim access to truth without being dependent upon interpretation -presupposes that knowledge of objective facts is enough to guide our -lives. Within this theoretical framework warnings are cast off as -unfounded, contingent, and subjective, even though philosophers of -science such as Bruno Latour continue to -[[remind]{.underline}](https://www.wiley.com/en-us/Down+to+Earth%3A+Politics+in+the+New+Climatic+Regime-p-9781509530564) -us that no "attested knowledge can stand on its own." The internet and, -in particular, social media have intensified this realist view, further -discrediting traditional vectors of legitimation (international -agencies, major newspapers, or credentialed academics) and rendering any -tweet by an anonymous blogger credible because it presents itself as -transparent, direct, and genuine. "The quickness of social media, as -Judith Butler [[pointed -out]{.underline}](https://www.newstatesman.com/international/2020/09/judith-butler-culture-wars-jk-rowling-and-living-anti-intellectual-times), -allows for forms of vitriol that do not exactly support thoughtful -debate."
- -Our inability to take warnings seriously has devastating consequences, -as recent months make clear. The central argument in favor of a -philosophy of warnings is not whether what it warns of comes to pass but -rather the pressure it exercises against those emergencies hidden and -subsumed under the global call to order. This pressure demands that our -political, environmental, and technological priorities be reconsidered, -revealing the alarming signs of democratic backsliding, biodiversity -loss, and commodification of our lives by surveillance capitalism. These -warnings are also why we should oppose any demand to "return to -normality," which signals primarily a desire to ignore what caused this -pandemic in the first place. A philosophy of warnings seeks to alter and -interrupt the reality we've become accustomed to.
- -Although a philosophy of warnings will not prevent future emergencies, -it will resist the ongoing silencing of emergencies under the guise of -realism by challenging our framed global order and its realist -advocates. This philosophy is not meant to rescue us *from* emergencies -but rather rescue us *into* emergencies that we are trained to ignore.
-- ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) )){% endfor %}