Simple firewall program - Firestarter

Xterm or Gnome terminal

1. apt-cache show firestarter

Package: firestarter
Priority: optional
Section: universe/admin
Installed-Size: 1964
Maintainer: Ubuntu MOTU Developers <ubuntu-motu@lists.ubuntu.com>
Original-Maintainer: Paul Cupis <paul@cupis.co.uk>
Architecture: amd64
Version: 1.0.3-6ubuntu3
Depends: gconf2 (>= 2.10.1-2), gksu (>= 0.8.5), iptables (>= 1.2.11), libart-2.0-2 (>= 2.3.18), libatk1.0-0 (>= 1.20.0), libbonobo2-0 (>= 2.15.0), libbonoboui2-0 (>= 2.15.1), libc6 (>= 2.4), libcairo2 (>= 1.6.0), libfontconfig1 (>= 2.4.0), libfreetype6 (>= 2.3.5), libgconf2-4 (>= 2.13.5), libglade2-0 (>= 1:2.6.1), libglib2.0-0 (>= 2.16.0), libgnome2-0 (>= 2.17.3), libgnomecanvas2-0 (>= 2.11.1), libgnomeui-0 (>= 2.17.1), libgnomevfs2-0 (>= 1:2.17.90), libgtk2.0-0 (>= 2.12.0), libice6 (>= 1:1.0.0), liborbit2 (>= 1:2.14.10), libpango1.0-0 (>= 1.20.1), libpixman-1-0, libpng12-0 (>= 1.2.13-4), libpopt0 (>= 1.10), libsm6, libx11-6, libxml2, libxrender1, lsb-base (>= 3.1), zlib1g (>= 1:1.2.3.3.dfsg-1)
Suggests: dhcp3-server
Filename: pool/universe/f/firestarter/firestarter_1.0.3-6ubuntu3_amd64.deb
Size: 409338
MD5sum: 89ec5d4996039b049ae4e7b198b97564
SHA1: 74c67aa6320f3e625cb186e0d5a1bfacec5d8168
SHA256: 9af3afc5fd66dd1cc18084293b7c8d95f59c2e096a93b969080bf33a4e377e55
Description: gtk program for managing and observing your firewall
 Firestarter is a complete firewall tool for Linux machines. It
 features an easy to use firewall wizard to quickly create a
 firewall. Using the program you can then open and close ports
 with a few clicks, or stealth your machine giving access only
 to a select few. The real-time hit monitor shows attackers
 probing your machine.
Bugs: mailto:ubuntu-users@lists.ubuntu.com
Origin: Ubuntu

2. apt-get install firestarter

3. visudo

Type i so as to input text .....(if you do not know about vi command)

Change

from Defaults       env_reset
to      # Defaults       env_reset

add the following line

Defaults !lecture,tty_tickets,!fqdn,env_reset,env_keep+="DISPLAY HOME XAUTHORIZATION"

Add the following line below the last line

USERID  ALL=NOPASSWD: /usr/sbin/firestarter

USERID must be your user id

Type ESC twice.
Shift+ :
wq

Gnome

1. System -> Preference -> Sesseion -> Add

Name : Firestarter
Command : sudo /usr/sbin/firestarter --start-hidden
comment : Desktop Firewall Tool

2. Configure the firestarter according to http://www.debianadmin.com/secure-ubuntu-desktop-using-firestarter-firewall.html