Closing Borders with Open Source
By :
Barrie Dempster
James Eaton-Lee
Preface
IPCop is a Linux-based, stateful firewall distribution that sits in between your Internet connection and your network and directs traffic using a set of rules framed by you. It provides most of the features that you would expect a modern firewall to have, and what is most important is that it sets this all up for you in a highly automated and simplified way.
IPCop runs on a dedicated box, and it completely takes over the hard drive, so don't use a drive with anything valuable on it. It will run on old or "obsolete" hardware, such as a 386 processor, 32Mb of RAM, and 300Mb hard disk. But if you plan on using
some of IPCop's features, such as the caching web proxy, or Intrusion Detection Logging, you are going to need more RAM, more disk space, and a faster processor.
At least one Network Interface Card NIC is required for the Green Interface. If you
will be connecting to the Internet via a cable modem, you will need two NICs.
Once installed you don't need to have a monitor or keyboard attached to the IPCop
box, as it runs as a headless server, and is administered over the network with a
web browser.
A block of code will be set as follows:
james@horus: ~ $ sudo nmap 10.10.2.32 -T Insane -O
Starting nmap 3.81 ( http://www.insecure.org/nmap/ ) at 2006-05-02 21:36 BST
Interesting ports on 10.10.2.32:
(The 1662 ports scanned but not shown below are in state: closed)
PORT STATE SERVICE
22/tcp open ssh
MAC Address: 00:30:AB:19:23:A9 (Delta Networks)
Device type: general purpose
Running: Linux 2.4.X|2.5.X|2.6.X
OS details: Linux 2.4.18 - 2.6.7
Uptime 0.034 days (since Tue May 2 20:47:15 2006)
Nmap finished: 1 IP address (1 host up) scanned in 8.364 seconds
Any command-line input and output is written as follows:
# mv /addons /addons.bak
# tar xzvf /addons-2.3-CLI-b2.tar.gz -C /
# cd /addons
# ./addoncfg -u
# ./addoncfg -i
New terms and important words are introduced in a bold-type font. Words that you see on the screen, in menus or dialog boxes for example, appear in our text like this: "We then go back to the addons page, click the Browse button, browse to the file we
just downloaded, click Upload, and the addon is installed on the server."
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