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1 - installation
2 - configuration
linux connection sharing with smoothwall
   In this article I will talk you through setting up SmoothWall to share your internet connection(modem,DSL,cable,ISDN) accross a network. Howvwer in thsi artcile I will only discuss how to set up SmoothWall to share a dialup modem connection, as this is the only type of connection I hhave been able to test it on.
 
   The first step is to download the latest copy of SmoothWall (0.99SE at the time of writing) from here. The file is a 20Mb ISO CD iamge, this needs to be burnt onto a CDR/CDRW. The next step is to choose a computer to install SmoothWall on, SmoothWall will replace any existing OS, and SmoothWall can only act as a firewall so choose a spare machine. The oficial minimum specifications are
  • Intel 80386 or higher
  • 8MB Ram
  • 60MB or bigger hard drive
  • At least one supported NIC
  • 4x CDROM Drive or faster
   However a machine meeting these minimum specifications is not really sufficient if you want to enable some of SmoothWall's features like intrusion detection, and proxying, I would recommend the minimum specifications as
  • Intel Pentium 75MHz or better
  • 64MB Ram
  • 1GB or bigger harddrive
  • External serial modem
(Update - If you want to use SmoothWall with a USB ADSL router e.g. Alcatel, older machine sometimes do not provide enough current through their USB ports, you can get around this by buying a powered USB hub)
 
   Once you have set your machine aside, the first thing is to put the CDR/CDRW which you put SmoothWall in your drive, and enable CD Booting in the BIOS. If the machine does not support CD Booting you will need to make a boot disk from the CD. When the CD has finished booting the welcome screen will appear
   On the next screen it will ask you for the type of installation media, choose CDROM the installer should then read from the CD for a while. The next step is to set up the networking for SmoothWall, the best option is to select Probe, even if you know your network cards settings. If SmoothWall finds a network card it will then prompt you for the IP Address, and Network Mask. If SmoothWall does not detect your NIC you will have to specify it manually by choosing Select. I always use the following settings
  • IP Address: 192.168.0.1
  • Network Mask: 255.255.255.0
   Once you have configured your network interface SmoothWall will install itself to your Hard disk, this may take a while, when this has finished the installer will prompt you for your default langauge and location. The final installation step is to finish the networking configuration, as we are using a dialup modem there is not much to do, the first think the Installer wants is the Hostname of your machine, I would recommend setting it to smoothwall.On the next screen select Network Configuration Type, on the Network type screen select GREEN (RED is modem/ISDN) .
On the next screen choose Cancel which actually means that you do not want to change the settings. The final network configuration step is to enable the DHCP server, this is useful as it allows you to automatically configure other machines on your network. I would use the following settings for configuring DHCP, leave all other settings as they are.
  • Start address:192.168.0.10
  • End address:192.168.0.254
  • Primary DNS:192.168.0.1
  • Default lease(mins):1000
  • Max lease(mins):2000
   The final step. is to set a password, make sure this is between 6 and 8 characters long, and contains upper and lower case letters, and numbers. When the installer prompts you remove the CD and select OK to reboot.

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