Implementing Wireless LANs: Security Considerations in Visual C#

Decoding UPC Code in Visual C# Implementing Wireless LANs: Security Considerations

8 Implementing Wireless LANs: Security Considerations
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Figure 8-3 IDS architecture
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Due to the administrative overhead of monitoring IDS sensors and keeping IDS signatures up-to-date, many companies choose to outsource this service An outsourced IDS service provides or sells sensors to be placed on the network and monitors them from the Internet or a dedicated telco link The monitoring service is responsible for updating changes and alerting administrators of any suspicious activity These services are expensive and are not for every enterprise You should evaluate your in-house security and monitoring expertise before deciding to use an outsourced IDS provider Some people feel that an IDS can also involve reviewing logs for suspicious events Regularly reviewing and archiving logs should be the standard practice on any network Many intrusion-related events do not produce suspicious-looking logs during the event so the effectiveness of these systems as IDSs is limited Additional IDS resources include wwwsnortorg wwwsourcefirecom wwwnfrcom wwwenterasyscom/ids/ wwwcounterpanecom
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Part 3 Wireless Deployment Strategies
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Application Security Considerations
Wireless networks are often set up to offer a specific application This may include roaming agents in airports, inventory tracking in warehouses, email, or service of the killer app to end users Many times these applications have already been hardened to work on a hostile network: the Internet In these cases, wireless security precautions, such as WEP and IP Security (IPSec) may not be needed Instead, SSL/Transport Layer Security (SSL/TLS) and SSH may be good ways to secure an existing application
Enterprise Campus Designs
The following section deals with the security needs of the enterprise campus Many applications are available for wireless networking on a campus In some cases, these designs can be combined into a hybrid design to solve multiple business problems Key design concepts are highlighted as best practices Use these best practices when evaluating your current design or when creating a hybrid design for your application
Enterprise Design 1
One of the most difficult challenges that wireless network designers face is the need to support many different platforms, operating systems, and hardware vendors with a single infrastructure The following design was used in a campus that needed to support a large population of engineers and salespeople Many of the engineers used different operating systems such as Windows, Linux, Berkeley Software Distribution (BSD), which is a Unix-like operating system, and Solaris To make matters worse, many of the engineers used their personal laptops, which had a wide variety of wireless network cards Due to the highly sensitive nature of the data being transmitted on the network and the network resources, security was a key concern Because the users were not very technical, ease of use also played an important role The solution to the problem proved to be easier than first anticipated The company already had an infrastructure for providing access from a hostile network (the Internet) with the corporate VPN The network
8 Implementing Wireless LANs: Security Considerations
designers remembered the pain and agony that it took to meet the engineers functional requirements with the VPN and did not want a repeat with the wireless network The decision was made to build a completely separate wireless network that would not have Internet connectivity and the internal network would only be accessible through the corporate VPN The corporate VPN consisted of an IPSec appliance and an SSH gateway that was configured for port forwarding Token-based one-time passwords (OTPs) were used on the IPSec appliance and the SSH gateway The corporate VPN already had a requirement for using a companyapproved secure build or utilizing a personal firewall with a companystandard rule set The installation proved to be easy Additional network cards were added to the IPSec appliance and the SSH gateway for connectivity to the wireless network, as shown in Figure 8-4 Only a few more machines were needed to make the network fully functional A server was added to provide Dynamic Host Configuration Protocol (DHCP) and Domain Name Server (DNS) services to the wireless users because the VPN and SSH clients were configured to connect to a hostname, not an IP address Another server was added to the wireless segment as an NIDS and a syslog server to capture logs from the access points and DHCP server Finally, a terminal server was installed to manage the access points and Ethernet switches because the only network-based management options offered by the vendor were cleartext (telnet and HTTP) The best practices include the following:
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