Wireless Base Station

1
Wireless Base Station

• Group 4

Group Members James Borley Jason Hall Adam
Shane Adam Stephens Richard Brooks
Client Dr. Shawn Ostermann
2
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

4
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

6
Overview

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

7
Hardware Alternatives

• PC 104
• Micro-ATX
• ATX

8
PC Hardware

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

9
(No Transcript)
10
Overview

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

11
Operating Systems

• Linux
• NetBSD
• Debian

12
Operating Systems (cont.)

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

13
(No Transcript)
14
Software Support

• PPTP
• PPP
• IPTABLES
• DHCP
• SSH

15
Overview

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

16
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

17
Connecting to the Ohio University Network

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

18
Client Login Screen
19
After Authentication

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

20
Networking Model I
21
Networking Model II
22
Overview

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

23
Authentication Methods

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

24
Authentication Process

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

25
Problem with SHELL commands

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

26
Solution for SHELL commands

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

27
(No Transcript)
28
Programming Process

• Shell Script
• SSH
• PPTP

29
(No Transcript)
30
Overview

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

31
Existing Antenna
32
Existing Antenna Range
33
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

34
Modification to Antenna

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

35
Why Both Types?

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

36
External Antennas
Monopoles
37
External Antennas
Dipole
38
Semi-Directional
39
Reflector Plates
40
Why Multiple Monopoles?

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

41
What is a Network Analyzer?

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

42
Network Analyzer
43
External Antenna Testing
44
The Choice
45
Existing Antenna
Location of Jack
46
Proprietary Connector
39
47
External Antenna Range
48
Range Comparison
Internal
External
49
Dipole Testing

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

50
Continued Antenna Development

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

51
Why Antenna Housing?

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

52
Overview

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

53
Timeline

• Milestones
• Authentication May 10
• Encryption May 10
• Final Testing June 10

54
Overview

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

55
Budget
56
Budget (cont.)

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

57
Summary

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

58
Questions?