TAILIEUCHUNG - Open Source Security Tools : Practical Guide to Security Applications part 11

Open Source Security Tools : Practical Guide to Security Applications part 11. Few frontline system administrators can afford to spend all day worrying about security. But in this age of widespread virus infections, worms, and digital attacks, no one can afford to neglect network defenses. Written with the harried IT manager in mind, Open Source Security Tools is a practical, hands-on introduction to open source security tools. | Page 79 Wednesday June 23 2004 2 59 PM Installing SmoothWall 79 You will see it formatting the disk and then probing your machine for its network interfaces. It should auto-detect any network interface cards NICs . It lets you accept or skip each one and set them up as firewall interfaces. For example if you have two NICs on your computer but only want to use one as a firewall interface on the firewall you would define that here. 4. Define the attributes of each selected interface. Assign them an IP address and subnet mask. After this SmoothWall installs some additional driver files and asks you to eject the CD-ROM. You have finished installing the program and will automatically enter setup mode. 5. In setup mode you will be asked for a hostname for the SmoothWall. You can use the hostname to access the machine instead of using its LAN IP address. 6. Next it asks if you want to install the configuration from a backup. This nifty feature allows you to easily restore your firewall to its original configuration if the system crashes assuming you made a backup which is covered later in this section . Don t select this unless you are in the process of restoring from a backup. 7. Assuming you chose to set up a new firewall not from backup in the previous step you will be prompted to set up several network types ISDN Leave this set to Disable if you aren t using ISDN. If you are then add the parameters appropriate for your IDSN line. ADSL This section is necessary only if you are using ADSL and actually have the ADSL modem in your computer. Leave this on Disable if you aren t using ADSL service or if the provider gives you an external modem to plug into. Otherwise click on the settings for your ADSL service. Network configuration SmoothWall divides its zones into three categories Green Your internal network segment to be protected or your trusted network. Red The external network to be firewalled off from the LAN. The untrusted network usually the Internet

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