Class 14: Internetworking with Remote Access, Wireless Networking

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Class 14 Internetworking with Remote Access,
Wireless Networking
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Connecting to the Network at My Workplace

• Virtual Private Networking (VPN)
• Trend in mobile computing
• Employs the Internet as long-distance carrier to
  enable distant, secure LAN connections
• Windows XP VPN
• Encrypts all traffic
• Setup with New Connection Wizard

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Setting Up an Advanced Connection

• Used to
• Establish direct connection between two systems
• Transfer large amount of data with no network
  connection
• Use serial or parallel cable
• Configure system to answer inbound dial-up calls
• Can act as remote access server for single
  incoming connection
• Only for special-purpose applications

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Alternate IP Configuration

• Available whenever networking connection object
  uses DHCP
• Preconfigure alternate default IP configuration
  if DHCP fails
• Prevents APIPA address from being assigned

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Remote Access Security

• Built on Windows XP local and network security
• Dial-up connection objects
• Authentication and encryption security options
• VPN
• Used to secure remote access

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Certificates

• Provide proof of identity for network and
  Internet communications
• Allow systems to trust unknown online parties for
  the purposes of
• Exchanging information
• Exchanging Data
• Performing e-commerce
• Product of cryptographic mechanism known as
  public key infrastructure (PKI)

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Certificates (continued)

• Certificate Authority (CA)
• Responsible for
• Creating
• Issuing
• Managing
• Revoking certificates
• Can be server computer system within
  organizations network or service offered by
  independent third-party organization

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Internet Options Applet

• Used to define settings for Internet Explorer and
  general Internet access
• Four Web zones
• Internet
• Local intranet
• Trusted sites
• Restricted sites

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Internet Options Applet (continued)

• Security restrictions
• Low
• Medium Low
• Medium
• High

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Windows XP and the Internet

• Tools to help access the Internet
• Internet Explorer
• Outlook Express
• FTP client,
• Telnet client
• Internet Information Server (IIS)

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Internet Explorer

• Version 6.0 is included
• State-of-the-art Web browser
• Tightly integrated with other Windows
  applications
• Wide range of security related configuration
  options
• Can be used as FTP client.

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Outlook Express

• Popular e-mail client utility
• Part of Microsoft Office
• Outlook Express included in Windows XP
• Used to read and write e-mail
• Used to file and sort messages
• Contact management tool

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FTP Client

• Command-line implementation of FTP client
  included in Windows XP
• Numerous freeware and shareware GUI
  implementations
• More user-friendly

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Telnet Client

• Simple tool provided in Windows XP
• Attempts to establish Telnet session with remote
  system based on domain name or IP address

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Internet Information Server

• Reduced functionality version of Internet
  Information Server (IIS) included with Windows XP
• Allows system to host Web and FTP services
• Limited to 10 simultaneous connections
• Not designed or intended for public Web/FTP site
  hosting

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Client Vs. Server-based Remote Access

• Limited to a single incoming dial-up connection
• Can support only 10 simultaneous network
  connections
• Can share an Internet link with a workgroup

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Wireless Networking

• Access Points
• Can Be Part of a SOHO Router
• Host requires a Wireless Card
• AKA WiFi
• Fully Supports TCP/IP

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Wireless 802.11b

• First Widely Used Standard
• Frequency 2.4 GHz
• Speed 11mb
• Range100ft indoors / 1000 outdoors
• Pros lowest cost signal range is best and is
  not easily obstructed
• Cons slowest maximum speed supports fewer
  simultaneous users appliances may interfere on
  the unregulated frequency band

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Wireless 802.11a

• Implemented simultaneously though not adopted as
  readily as -a
• Speed 54mb
• Hybrids of Best of Breed a b also made, but
  not integrated
• Pros fastest maximum speed supports more
  simultaneous users regulated frequencies prevent
  signal interference from other devices
• Cons highest cost shorter range signal that is
  more easily obstructed

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Wireless 802.11g

• First Widely Used Standard
• Speed 54mb
• Frequency 2.5GHz Best Penetrating Power
• Hybrids of Best of Breed a b also made, but
  not integrated
• Pros fastest maximum speed supports more
  simulatenous users signal range is best and is
  not easily obstruct
• Cons costs more than 802.11b appliances may
  interfere on the unregulated signal frequency

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Wireless Bluetooth

• Short Range 10 Meters
• Speed 1mb
• Used mostly to connect two devices (typically
  PDAs, phones, and wearable scanners in
  industrial applications
• Low cost

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Wireless Other Setup Parameters

• Infrastructure Mode
• Use Access Points to Communicate With Other
  Wireless Devices and to Network
• Ad-Hoc Mode
• Peer to Peer network where Devices Communicate
  Without an Access Point

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Wireless Some Pictures
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Wireless Some Pictures
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Wireless Some Pictures
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Wireless Some Pictures
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Wireless Some Pictures
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Wireless Security

• None
• WEP 64 bit
• WEP 128 bit
• WPA
• RADIUS, PAP, CHAP
• MAC Inclusion Exclusion
• IPSec

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Wireless Security

• SSID The Broadcast Name Can be set to not
  reveal name
• Change Default Base Station Name
• Encrypt Wireless Password Using WPA
• Allow Only Authorized MACs
• Network Secure
• Password Discipline - Used, Changed, Strong

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Wireless Other Issues

• Troubleshooting Connections
• Using Multiple Locations Can Reset Security
• Settings Variances Between AP and Wireless Card
• MAC List Usage
• 3rd Party Firewalls
• WID Devices
• ???