Some IT experts argue that DSL is not the most secure connection on the Internet. Before, IP addresses turned over quickly; now, they tend to remain stagnant longer, thus becoming more vulnerable to virus attack. Furthermore, both cable and DSL modems remain "on," which allows for greater access by an uninvited intruder. In addition, more criminals are turning to the Internet for easy pickings. Some work very quickly, so when you install a new system, they can look over its workings before you have time to put up a firewall. For these reasons and more, Internet users need to protect their programs with appropriate firewalls and security software. Using IP addresses that cannot be routed within the system is one way of managing the problem. Another is to buy an appropriate application like ZoneLab for smaller companies or home-based businesses. Many of these are affordable at just a couple of hundred dollars, excluding installation fees that you may have to pay someone if a company representative or the network administrator is not familiar with installation protocols. After installing these or other security applications, make sure they work properly by running a systems check. Keep transcripts so you can go over the numbers later, more carefully. See that all computer users are registered and are able to access only the programs and files they are entitled to see. Check your firewalls periodically to see if updates are needed. You may want to install a DSL filter so that the line operates the way it should and suppresses false alarms. Operating a personal computer at the office or at home can be fun, easy, and profitable. But it is important to care for details like your DSL line so that everything works together to create a smooth system that helps you get things done. As with any operation, DSL security is not without risks. Compare the benefits and disadvantages, along with cost, installation time, and maintenance upgrades, to get the best possible security systems for your DSL line.