"guerrilla networking": building local area networks
TRANSCRIPT
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“Guerrilla Networking”:Building Local Area Networks
Copyright 2001 by WiderNet Project
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Last time we talked about making the connections between single computers
and the larger Internet, this time we focus on wiring similar computers
together as peers.
WAN = Wide Area NetworkLAN = Local Area Network
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But first...
a brief aside (rant and rave)
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Guerrilla Networking
• Computers were designed to be calculators, to crunch numbers swiftly
• Humans being humans, we quickly found ways to use them to communicate (our #1 priority...)
• WWW, email, video conferencing, desktop publishing, word processors, all polished tools for communicating
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Guerrilla Networking
• The form of computer networks are neither accidental nor planned
• Organic• The wires -- like a root of a tree, the
growth of a mold, or the course of a river -- follow a compelling intention and operate within very real physical constraints
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Guerrilla Networking
• A bird’s eye view of any network would demonstrate two things: who has the money to build networks and who is compelled to communicate with who
• Resource sharing (printers, modems, etc.) is important, but involves only a few nodes per network
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Guerrilla Networking
• “Planned” networks usually wind up being drastically different than originally conceived
• Larger networks are constrained by their inherent complexity, thus limiting their ability to deliver individualized and cutting-edge services on demand
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Guerrilla Networking
• Inevitably, humans take matters into their owns hands
• Those with the money and desire grab the technology and bend it to their wills
• Technological savvy is rarely a limiting factor -- it’s learned on the job
• The birth of a nerd
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Guerrilla Networking
• Networking technology has grown simpler over the last ten years and promises to become even more so
• Much of what used to take trained technicians and specialized equipment to install and maintain is now plug-and-play
• The industry is now focusing on networking the “home” computer. Making things simpler will be key
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Guerrilla Networking
• Just a couple years ago, one had to install special software on a computer to make it capable of communicating over a network
• Now all modern operating system software comes with strong networking code built-in (Mac OS9, Windows95, 98, NT, 2000, XP)
• 100Base-T connections now standard on many new computers
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Guerrilla Networking the bottom line
• Networking a computer costs as little as N2,000 per computer
• Plug-and-play technology makes it simple to set up a network
• Users more free than ever before to set up networks that work the way they do
• Growing more organic every day
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LANs -- Sharing resources
• Printers• Facsimile devices• Modems• WAN connections (Internet)• Storage devices (Disks, tape drives, etc.)• Databases, documents, etc.
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The components of a LAN
• Network card
• Wire
• Concentrator
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A “Star” LAN
All devices connected to a
hub which manages the
network
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Network HUB
Can manage from 6 to 100’s of networked devices.
Range in price from N7,500 to N2,000,000
Can be managed from a desktop with SNMP
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File Server Networks
• All the nodes share one large hard drive on central server(s)
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Peer-to-peer Networks
• All the nodes act as servers and clients, sharing their resources
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Mixed Networks
• Today it is getting hard to distinguish• Peer-to-peer and file servers employed on
the same wire• Different protocols allow one to be on
many networks simultaneously
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A Simple Small Workgroup LAN
• Six network cards, a concentrator, some wire
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A Simple Small Workgroup LAN
• Six network cards @ N2,000 = N12,000• Six port 10Base-T concentrator = N7,500• 120 ft. wire @ N50 a foot = $6,000• Total = N25,500
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A Simple Small Workgroup LAN
• Once the LAN is established, anything that is attached becomes sharable:– Scanner (N40,000)– Printer (N18,000 - N80,000)– Tape backup (N15,000 - N120,000)– WAN connection (N1,000/month to ???)
• Great economy is realized by not buying redundant hardware
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Last Slide
The End
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