Chapter 8 (Web hosting servers) . Running Fedora Core and Red
Chapter 8 . Running Fedora Core and Red Hat Enterprise Linux 295 16. Choose a firewall configuration. The use of a firewall has significant impact on the security of your computer. If you are connected to the Internet or to another public network, a firewall can limit the ways an intruder can break into your Linux system. Here are your choices: No firewall Select this security level if you are not connected to a public network and do not want to deny requests for services from any computer on your local network. Of course, you can still restrict access to services by starting up only the services you want to offer and by using configuration files to restrict access to individual services. Enable firewall Select this security level if you are connecting your Linux system to the Internet for Web browsing and file downloading (FTP). By default, only services needed to enable Web browsing and basic network setup, DNS replies, and DHCP (to serve addresses) are allowed at this level. If you enable the firewall and you know you want to enable access to particular services, you can click the appropriate check boxes and allow incoming requests for the following services: SSH (secure shell to allow remote login), Telnet (an insecure method of remote login), WWW (act as a Web server), Mail (act as a mail server), and/or FTP (act as an FTP server). You can also add a comma-separated list of port numbers to the Other Ports box to open access to those ports, which effectively allows requests to services associated with those port numbers. (The /etc/services file lists which services are associated with which port numbers.) If you have a LAN that consists of trusted computers, you can click the box representing your interface to that LAN (probably eth0). Clicking the box allows access to any services you care to share with the computers on your LAN. Click Next to continue. Adding firewall rules here results in rules being added to the /etc/sysconfig/ iptables file. The rules are run from the /etc/init.d/iptables startup script when you boot your system. 17. Choose language support. The default is your installation language. You can install support for additional languages by clicking the check boxes next to the languages you want. Click the Select All button to install all supported languages to your system. When you are done, click Next to continue. 18. Choose a time zone. Select one from the list. To see a more specific view of your location, click World and choose your continent. From the UTC Offset tab, you can choose a time zone according to the number of hours away from Greenwich Mean Time (GMT), known as the UTC offset. 19. Set root password. The root password provides complete control of your Fedora system. Without it, and before you add other users, you will have no access to your own system. Enter the password, and then type it again in the Confirm box. (Remember the root user s password and keep it confidential! Don t lose it!) Click Next to continue. Tip
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