Web hosting e commerce - Firewallsprotect your system from unauthorized access and discovery.
Firewallsprotect your system from unauthorized access and discovery. When you re connected to the Internet with a high-speed connection, your computer appears as one of the hundreds of thousands of other sys- tems on the Internet. I wish that I could tell you that there aren t tons ofnasty people and programs trying to break into your computer, but unfor- tunately, there s lots of them. A firewall is your first (but not only) protec- tive barrier against cyber-hoodlums, viruses, worms, and a host of otheritems that might try to skulk in through doors that should have been keptclosed; see the sidebar Firewalls and you for more information. 13.Unless you are 100-percent sure that this computer is safe from boththe Internet and other machines you may have on your home or officenetwork (keeping in mind that before viruses and worms, most busi- ness computer break-ins happened from inside rather than outside), leave Enable Firewall as your firewall setting. If you are absolutely determined to have your firewall off, select NoFirewall. I wish you luck! 14.Determine which of the available services you want to let throughyour firewall. I recommend enabling Remote Login (SSH) so that you can access thiscomputer remotely using the techniques discussed in Chapter 12. WhileI don t cover running your own Web server, if you intend to run one onthis computer, you ll also want to enable the Web Server (HTTP, HTTPS) entry; if you just want to browse the Web, you don t need to enable thisone, it s just if you want to run your own server on this computer. Thesame goes for FTP (which can be handy for moving files around) andSMTP. If you intend to run an FTP server or a mail server (SMTP), thenyou ll need to enable these. 15.Next to each item you want to enable, click in the box so that it has acheckmark in it. For my desktop machines, I tend to check the SSH and FTP entries. For how to use an FTP client to get files off of this machine later, seeChapter 8.16.Determine whether you want to use SELinux or not. SELinux (otherwise known as Security-Enhanced Linux) is explained ingreat geekly terms at http://people.redhat.com/kwade/fedora- docs/selinux-faq-en/. For those who aren t interested in readingthrough such a document until their eyes cross, I give you a summary inthe sidebar Introducing SELinux. Keep in mind that if you ve neverused Linux or another form of Unix, you may find it difficult enough tolearn your way through the usual user, group, and owner permissionsystem used to control file and directory access. You can turn onSELinux later (I go more into SELinux in Chapter 12) if you decide it stime to get to know it. 54Part I:Getting Your Feet Wet
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