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Wireless Mobile IP Networking

Enabled by

AirBoss Wireless Solutions

Mobile IP Solution

Technical Product Summary


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Executive Summary

With the rapid growth and availability of wireless data networks, wireless communications tools andInternet standards, mobile workers are finding new ways to do business in todays competitiveenvironment. The need for the mobile worker to access mission critical information requires access to

corporate databases and Internet/Intranet applications. In addition, convenient and reliable file transfer,integrated messaging, and personalized information delivery allow the mobile employee to work at peakproductivity levels.

Successful communications between mobile workers and their corporate environment requires the rightcombination of technologies. From a business standpoint, these technologies must be cost-effective andeasy to use. For long-term viability, they should be based on open system architectures and industrystandard interfaces.

Virtual Private Networks have emerged to provide networking solutions to a growing mobile workforce.A Virtual Private Network allows businesses to provide their mobile employees with access to corporateinformation and applications by connecting them to the enterprise using public networks, such as theInternet. By using public networks as the communications backbone, a Virtual Private Network providesa low cost extension to the enterprise, while offering secure access to an open networking environment.

Telcordia Technologies (formerly Bellcore)AirBoss Wireless Solutions portfolio of wireless data and messaging products offers a MobileIP solution which provides the foundation to create Virtual Private Networks.

What is a Virtual Private Network?

A Virtual Private Network is created when a mobile user connects a data terminal to a foreign network,either via dial-in or public networks, and establishes a presence equivalent to a direct connection to thehome network.

The AirBoss Mobile IP solution is intended to enable the creation of Virtual Private Networks by usingthe Internet as the communications backbone to connect mobile users. The following featurescharacterize Virtual Private Networks:

Remote presence - the ability to establish remote network connections and still appear to beconnected to the home network.

Network independence - the ability to roam among networks (e.g., BellSouth Wireless DataNetwork - CDPD - Wireless LAN Ethernet). Traditionally, IP network independence (roaming) is doneover the same media access (e.g., SLIP, PPP, Ethernet). Telcordia Technologies Virtual Private Networkimplementation offers the ability to roam across not only single media IP networks, but across multiplewireless and wireline media without userintervention.

Security - the ability to help create secure channels for authentication, data integrity, and data

privacy.The AirBoss Mobile IP solution is unique in that it provides wireless and wireline IP network and mediaroaming/communications to both Intranet and Internet services. The ability for mobile users to roamseamlessly and without intervention among radio frequency (RF) networks and wireline networks allowsthe system to operate at maximum system efficiency.

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Mobile IP Description

Traditional implementations of the TCP/IP suite of protocols assume that a nodes IP address uniquelyidentifies its point of attachment to the Internet. In this environment, a node could maintain continuousconnectivity while moving between different networks in one of two ways:

1) the mobile node could alter its IP address every time it moved, or

2) it could have host specific routes propagated to all possible correspondents throughoutthe Internet.

Both of these scenarios are undesirable. Altering the IP address would cause the breakdown of existingtransport level connections, while the propagation of host routes causes severe scaling problems,especially with an ever-increasing number of mobile nodes seeking the host node.

Mobile IP is an Internet industry standard that enhances the IP protocol to remedy these existingproblems and allows transparent routing of IP datagrams to mobile nodes on the Internet. Figure 1 showsa high-level diagram of the AirBoss Mobile IP Network Configuration.

ireless

Local Area Network

Access PointWireless

Local Area Network

(Home Network)

GenericRouter

Home Agent

192.4.18.74

(Care-of Address)

Foreign Agent

198.223.32.86

ireless

ide Area Network

Access Point

192.4.18.0

(Foreign Network)

WirelessWide Area Network

Internet

A- 192.4.18.124 - HomeB- 192.4.18.125 - c/o 198.223.32.86

AccessPoint

Access

Point

Mobile Node A

Home Address - 192.4.18.124

198.223.32.0

AirBossServer

192.4.18.32

Mobile Node B

Home Address - 192.4.18.125

Care-of Address - 198.223.32.86

Figure 1 - AirBoss Mobile IP Network Configuration

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Using the Mobile IP solution, the mobile nodes in Figure 1 are always identified by their permanenthome address, regardless of their current point of attachment to the Internet. In addition to thispermanent home address, the mobile node, while away from its home network, is also associated with atemporary care-of address, which provides information about the current point of attachment to theInternet. Mobile IP makes the goal of location-transparent communications possible by defining a set ofmechanisms for mobile nodes to acquire a care-of address. It also ensures a means by which packets

destined for the mobile node (and hence delivered by traditional IP routing mechanisms to the mobilenodes home network) are ultimately forwarded to the present location of the mobile node, as indicatedby its current care-of address.

The basic element in this protocol is the Mobile Node, also referred to as the mobile host, which roamsamong its home network and other foreign networks. Mobility is achieved in part by having a host onthe mobile nodes home network, called the Home Agent, which is responsible for trapping packetsdestined to the mobile node, and then forwarding them to the present location of the mobile node, if it isaway from home. The present location of the mobile node is in the form of a care-of address. Thiscare-of address is obtained either directly by the mobile node using an external assignment mechanism(i.e., Dynamic Host Configuration Protocol [DHCP]) or from a special node, called a Foreign Agent,which is present on the foreign network and provides mobility services to visiting mobile nodes. Packetsare forwarded from the Home Agent to the care-of address by encapsulating and tunneling them to the

care-of address. If the care-of address at the end of the tunnel is that of the Foreign Agent, the packetsare decapsulated by the Foreign Agent and forwarded by link-level mechanisms locally to the mobilenode.

Mobile IP Security

Security is an integral part of building a Virtual Private Network solution. The AirBoss Mobile IPNetwork Configuration utilizes Mobile IP encryption to form a secure channel between the AirBossclient and server to support user authentication, data integrity, and data privacy in mobile environments.Figure 2 illustrates how a mobile client can securely connect to an application server residing in themobile clients enterprise or home network through foreign wireless and wireline networks. Using theAirBoss Mobile IP encryption, a secure channel is formed which allows various foreign networks tobecome extensions of the home network.

ISP - B

Subnet

ISP - A

Subnet

Internet

EnterpriseApplications

Mobile IP Encryption

AirBoss

Server

AirBoss MIP

Client

Wireless

Network

Figure 2 - AirBoss Mobile IP Security

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Benefits of the AirBoss Mobile IP Solution

The AirBoss Mobile IP solution offers customers the following benefits:

Helps to provide secure access to an open networking environment using Mobile IPencryption between the AirBoss client and server

Allows mobile workers to establish a remote network presence in a cost efficient manner Intends to enable least-cost routing while providing maximum system efficiency

Provides wireless and wireline internetworking

Provides seamless roaming across networks without user intervention

Offers a low-cost solution for adding mobility to Intranets/Internet

Solutions for Mobility Applications

Telcordia Technologies AirBoss Mobile IP solution can be used to enable seamless roaming betweenwireless networks to extend enterprise applications to mobile workers. The capabilities provided by the

Mobile IP solution creates enhanced services for a variety of vertical applications. Vertical markets, suchas trucking and transportation, healthcare, public safety and utilities, have realized the benefits thatMobile IP can offer to improve communications across the enterprise.

The AirBoss Mobile IP solution not only provides reliable wireless transport over wide-area networks(i.e., BellSouth Wireless Data Network, CDPD), but allows a mobile data terminal to seamlessly migratebetween a wireless wide-area network and a wireless LAN.

Figure 3 represents the Mobile IP architecture used in the AirBoss solution to enable wireless mobiledatabase applications:

WirelessWide-AreaNetwork

LAN

AirBossServer

WirelessLANAccessPoints

MobileDataTerminalscontainbothWirelessLANandWirelessWide-AreaNetworkModems

Intranet

Internet

EnterpriseApplications

Figure 3 - Enabling Wireless Mobile Database Applications

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This solution allows a mobile data terminal to seamlessly migrate between a wireless LAN and a wirelesswide-area network (e.g., BellSouth Wireless Data, CDPD). The roaming features enable uninterrupteddata service connections between the AirBoss Server and a mobile data terminal, which is also setup torelay data over wireless wide-area networks.

While out of range of the wireless local area network, the mobile employee, using a mobile data terminal,

has access to enterprise applications over a wireless wide-area network. However, as the mobile dataterminal comes into range of the fixed wireless LAN, the AirBoss Mobile IP software automaticallymigrates to the fixed wireless LAN, allowing cost-effective access to enterprise information. Insummary, the Mobile IP solution is intended to provide least-cost routingbetween a wireless LAN and awireless wide area network, such as BellSouth Wireless Data or CDPD.

SummaryThe success of a corporation in todays competitive environment will depend largely on its ability toincrease productivity, while providing the highest level of customer service. Reliable, cost-effectivenetworking solutions will be a critical component of a corporations communications infrastructure. TheAirBoss Mobile IP solution is intended to enable enterprises to create their own Virtual PrivateNetworks, thus providing:

low initial costs

low operating costs

solution flexibility

significant productivity gains

By providing seamless network roaming and communications capabilities, Mobile IP provides anetworking solution to take enterprises into the 21st century and beyond.

Telcordia TechnologiesAirBoss Wireless Solutions...

providing data communications solutions for industries on the move.

For more information contact your local sales account representative or call:1-800-521-2673 (U.S. and Canada)

1-732-699-5800 (in all other countries)Or discover us on the Internet

http://www.telcordia.com/airboss

Copyright 2000 Telcordia Technologies. All rights reserved.

AirBoss and AirBrowse are trademarks of Telcordia Technologies.Windows is a registered trademark of Microsoft Corporation.

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