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Case Study 2
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Organization: Multinational manufacturing firm User base: Employees
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Real Examples from the Wireless World
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Geographic location: North American initially, followed by Europe Application: Wireless e-mail for mobile executives Business requirement: Enable wireless access to existing e-mail infrastructure Solution: WAP-compliant handsets connect to existing Microsoft e-mail accounts via middleware The solution used on both GSM and Time Division Multiple Access (TDMA) networks Background: This organization faced an increasingly common enterprise IT problem how does one improve end-user access to critical corporate information without sacrificing security In addition, as end users became increasingly mobile, the average user might not access the corporate network until the end of the business day, which affected response times (reducing customer satisfaction) and often hampered decision making (increasing organizational inefficiency) Much like airline pioneer Southwest Airlines discovered that planes do not make money when sitting on the ground, employees do not generate revenue or increase shareholder value when tethered to a PC synchronizing e-mail for three hours a day It was for these reasons that wireless e-mail emerged as the dominant initial wireless application for most enterprises This organization also had three other requirements that are commonly shared by other companies
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Compatibility with existing e-mail infrastructure The last thing the company wanted was to create separate wireless e-mail accounts for users Thus, the wireless solution had to interface with the existing e-mail system, in this case, Microsoft Outlook Network independence The company s diverse geographic operations meant that their users were dispersed among the major network operators, so both Code Division Multiple Access (CDMA), TDMA, and GSM users needed to be supported Consistency with existing security policy Given the rapid deployment plans, the IT department did not have time to create entirely new security policies just for the wireless application This meant that the application had to conform to existing wired security policies pertaining to encryption, authentication, and any other relevant rules
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Part 3 Wireless Deployment Strategies
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The organization considered the Blackberry e-mail pagers, but the incremental hardware cost was significant, and the company had already deployed WAP-enabled mobile phones to a large majority of their employees The organization s ultimate implementation relied on using a wireless e-mail middleware server that could communicate with their existing Microsoft Exchange server The organization also created a separate Demilitarized Zone (DMZ) to host the middleware server Figure 10-3 displays the architecture in greater detail Creating the DMZ is an important consideration because it isolates the corporate network from potential wireless attacks A key component here is proper configuration of the firewalls Only those most crucial ports (such as ports 80 and 443) should be enabled
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What Are Ports
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Many information security discussions often talk about opening ports on a firewall Although the principle of opening holes in a firewall may seem counterproductive, restricting access based on certain ports is an adequate defense mechanism So what are ports A port is basically a fixed numeric value contained within a packet of data that tells a given packet where to go Put another way, a port informs the recipient where to listen for an incoming transmission Many port numbers are often fixed; for instance, all web traffic generally travels on port 80 In addition, a California-based organization called Internet Assigned Numbers Authority (IANA) is responsible for managing and allocating ports to vendors In the security spectrum, ports 80 and 443 are most relevant because port 80 is for all web traffic, and port 443 is utilized for the SSL protocol Because only data corresponding to these port numbers will be allowed through, opening a port on a firewall does not pose a grave security risk
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Figure 10-3 Corporate wireless e-mail solution
Network Operator CDMA, GDM, FDMA Internet
Firewall Firewall
WAP Gateway DM2 WAP Handset
Wireless E-mail Server
Microsoft Exchange
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Figure 10-4 Data traffic flow for Case Study 2
WAP Phone WTLS
Real Examples from the Wireless World
Port 80 Port 443 Port 135 Port 1024 Wireless E-mail Server E-mail Server
E-mail Server
Figure 10-4 illustrates the data ports that are utilized for this connection A key element in this case study is that it relies on existing WAP technology The company was well versed in the WAP Gap issue, but timeliness was essential, so the company moved ahead with the wireless project and sought to minimize the WAP Gap issue By utilizing the DMZ and enforcing secondary authentication, the company mitigated the potential WAP issue Also, this solution enabled the organization to utilize its installed base of WAP terminals and keep their current e-mail accounts Although this project was still in early deployment at press time, the initial pilot and subsequent production rollout were received very positively by the end users The most commonly cited benefit was real-time access to e-mail and the productivity gains enabled by being able to respond to messages immediately
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