A typical firewall network configuration in Software

Draw QR Code 2d barcode in Software A typical firewall network configuration

A typical firewall network configuration
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Finally, authentication services can be implemented. These techniques range from simple password-based logons to more complex methods utilizing digital cipher cards. When considering firewalls, we again see the tradeoff between security and performance. Firewalls are generally implemented with one of two methodologies: accept all packets (for maximum application compatibility) or deny all packets (for maximum security). In either case, only the exceptions to the rule are specified. It s important to note that specific applications will require certain TCP/IP ports to be open for communications. (One example is Windows NT trust relationships that require certain types of NetBIOS traffic.) For this reason, you need to test your firewall policies with actual business applications before deploying technology that may impede your system. Physically, a firewall may be a piece of software, a router with specialized features, or a stand-alone server optimized to look at packets. Each solution varies in security, price, and performance. Microsoft s Proxy Server product has been designed to provide basic firewall protection. More information can be found from Microsoft and from various company websites.
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The use of remote access is becoming much more common in many businesses today. Users are increasingly depending on the ability to access information stored on a corporate network from remote locations, whether they are traveling and dialing in from a hotel room or connecting over VPN from home. For over a decade, the most common method of connecting to a remote network was through the use of an analog phone line and a modem. Windows NT Remote Access Service (RAS) has been designed to support this type of connectivity. In Windows NT 4 and Windows 2000, however, even more functionality is supported, such as Virtual Private Networks (VPNs). Although all of the general Windows NT best practices for managing security apply to using RAS, the following are additional considerations you must make to secure remote access: w Managing dial-in permissions Using either User Manager or the Remote Access Administrator tools, you can specify which users can and cannot dial in to your Windows NT system from remote locations. It is important to ensure that only users who need remote access are granted dial-in permissions, since anyone who is aware of your remote access phone number can attempt to guess these values. Additionally, you might want to enforce restrictions on logon hours so that users cannot dial in, for example, on weekends. Auditing We discussed the auditing of logons and logoffs earlier in this chapter, but it s worth mentioning again here since you should be particularly interested in which individuals are logging on to your network. Setting call-back security For dial-up point-to-point connections, such as ISDN lines or analog modems using telephone lines, you can set up call-back security. In User Manager, you can specify one of the three Call Back options shown here:
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Callbacks can help you ensure that people are calling from expected locations. For example, if a user should only have permissions to dial in to the corporate network from home, he or she should not be able to dial in using the same username and password from a different phone number. Callbacks are also useful in helping to control remote access costs. By having a user dial in to the remote access server and specify a number, the costs associated with toll-free numbers or borne by the client can be eliminated. For more information on using RAS and VPN features in Windows NT 4 or Windows 2000, start at the Microsoft Communications page: www.microsoft.com/communications. There, you ll find links to white papers and to more information on configuring, managing, and securing remote access for your organization.
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