Wireless Base Station

1
Wireless Base Station

• Group 4

Group Members James Borley Richard Brooks Jason
Hall Adam Shane Adam Stephens Client Dr. Shawn
Ostermann
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Overview

• Introduction
• Project Topics and Issues
• Hardware
• Operating System
• Client Configuration and Network Model
• Authentication
• Antennas
• Timeline
• Budget
• Summary

3
Problem Statement

• Need a secure wireless base station
• Current off-the-shelf base stations
• Insecure encryption
• No authentication

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Goals and Objectives

• Build a wireless base station
• Use off-the-shelf parts
• Present user with a user-friendly login prompt
• Authenticate users against a central location

5
Constraints

• Budget of 500
• Compatible with Industry Standard IEEE 802.11b
• Secure wireless transmission over 802.11b

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Overview

• Introduction
• Project Topics and Issues
• Hardware
• Operating System
• Client Configuration and Network Model
• Authentication
• Antennas
• Timeline
• Budget
• Summary

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Hardware Alternatives

• PC 104
• Micro-ATX
• ATX

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PC Hardware

• Asus A7S-VM Motherboard
• AMD K7 Duron 750MHz
• 128MB of Micron PC 133 RAM
• Avaya Silver Wireless Adapter
• Avaya PCMCIA -gt PCI Adapter

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Overview

• Introduction
• Project Topics and Issues
• Hardware
• Operating System
• Client Configuration and Network Model
• Authentication
• Antennas
• Timeline
• Budget
• Summary

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Operating Systems

• Linux
• NetBSD

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Operating Systems (cont.)

• Linux
• Slackware
• Linux From Scratch (LFS)
• Red Hat 7.2
• Familiar
• Journaling filesystem

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Software Support

• PPTP
• PPP
• IPTABLES
• DHCP
• SSH

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Overview

• Introduction
• Project Topics and Issues
• Hardware
• Operating System
• Client Configuration and Network Model
• Authentication
• Antennas
• Timeline
• Budget
• Summary

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Configuring the Client

• Configure wireless adapter on client
• ESSID kramer
• Channel 8
• Client is automatically assigned private IP
  address
• Used to establish connection with the PPTP Daemon

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Connecting to the Ohio University Network

• User connects to PPTP daemon using VPN client
  software.
• Authentication process checks for good
  username/password.

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Client Login Screen
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After Authentication

• PPP interfaces are created
• Client side receives a public Internet address
• Client has presence on network.

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Networking Model I
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Networking Model II
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Overview

• Introduction
• Project Topics and Issues
• Hardware
• Operating System
• Client Configuration and Network Model
• Authentication
• Antennas
• Timeline
• Budget
• Summary

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Authentication Methods

• Chosen Method
• SSH
• Alternative Methods
• Web Interface
• Kerberos
• Radius

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Authentication Process

• Exit value for login
• 0 for accepted login attempt
• 255 for rejected login attempt
• Used /bin/true at verify

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Problem with SHELL commands

• Problem with Security
• SSH takes SHELL commands
• SHELL commands are logged
• Example
• ssh name_at_oak.cats.ohiou.edu

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Solution for SHELL commands

• Dont enter password at SHELL
• Use File Descriptors
• Use Pipes to pass the password

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Programming Process

• Shell Script
• SSH
• PPTP

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Overview

• Introduction
• Project Topics and Issues
• Hardware
• Operating System
• Client Configuration and Network Model
• Authentication
• Antennas
• Timeline
• Budget
• Summary

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Existing Antenna
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Existing Antenna Range
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Modification to Antenna

• Amplifier is too technically advanced
• Circuitry is complex due to 2.4 GHz
• Dont have the knowledge or equipment
• 2.4 GHz telephones
• Amplifier is contained in ICs

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Modification to Antenna

• Build External Antennas
• Monopole
• Physical shape Omni-Directional
• Dipole
• Semi-directional

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Why Both Types?

• Choices for Clients Needs
• Omni-directional
• Semi-directional

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External Antennas
Monopoles
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External Antennas
Dipole
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Semi-Directional
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Reflector Plates
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Why Multiple Monopoles?

• Antennas must be impedance matched to wireless
  card circuitry
• Build both, and test with Network Analyzer

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What is a Network Analyzer?

• Visually shows a complex value of resistance
• Able to adjust antenna to optimize efficiency

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Network Analyzer
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External Antenna Testing
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The Choice
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Existing Antenna
Location of Jack
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Proprietary Connector
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External Antenna Range
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Range Comparison
Internal
External
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Dipole Testing

• Prototype Built
• Preliminary Testing In Progress
• Network Analyzer Test
• Range Testing

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Continued Antenna Development

• Continue Testing
• Try Different Placement of Antenna
• Link Test Rooms and Other Floors
• Create Housing for Antennas

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Why Antenna Housing?

• For A Customer
• Impedance Matched
• Aesthetics
• Safety Reasons

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Overview

• Introduction
• Project Topics and Issues
• Hardware
• Operating System
• Client Configuration and Network Model
• Authentication
• Antennas
• Timeline
• Budget
• Summary

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Timeline

• Milestones
• Operating System Jan. 25
• Antennas March 16
• Authentication May 7
• Encryption May 7
• Final Testing June 7

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Overview

• Introduction
• Project Topics and Issues
• Hardware
• Operating System
• Client Configuration and Network Model
• Authentication
• Antennas
• Timeline
• Budget
• Summary

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Budget
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Budget (cont.)

• Person-Hours
• Group 200 hrs
• Dr. Ostermann 20 hrs
• Dr. Bartone 10 hrs

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Summary

• Introduction
• Project Topics and Issues
• Hardware
• Operating System
• Client Configuration and Network Model
• Authentication
• Antennas
• Timeline
• Budget
• Summary

57
Questions?