There are a lot of choices you can use to protect your system. Just use standard installation command to install it.
For example, you if want to install Lokkit, just use apt-get install command. Make sure you have the ‘universe‘ componet enabled in your repository.
taufanlubis@zyrex:~$ sudo apt-get install lokkit
Security tools for Ubuntu:
shorewall – Shoreline Firewall (Shorewall), a high-level tool for configuring Netfilter
arno-iptables-firewall – Single- and multi-homed firewall script with DSL/ADSL support
arptables – ARP table administration
ebtables – Ethernet bridge frame table administration
fail2ban – bans IPs that cause multiple authentication errors
ferm – maintain and setup complicated firewall rules
fiaif – An easy to use, yet complex firewall
filtergen – packet filter generator for various firewall systems
firehol – An easy to use but powerful iptables stateful firewall
fprobe-ulog – export captured traffic to remote NetFlow Collector (ULOG version)
fwanalog – firewall log-file report generator (using analog)
fwlogwatch – Firewall log analyzer
gnome-lokkit – basic interactive firewall configuration tool (GNOME interface)
guarddog – firewall configuration utility for KDE
guidedog – NAT/masquerading/port-forwarding configuration tool for KDE
ipac-ng – IP Accounting for iptables (kernel >=2.4)
ipkungfu – iptables-based Linux firewall
ipset – administration tool for kernel IP sets
iptstate – Top-like state for netfilter/iptables
kmyfirewall – iptables based firewall configuration tool for KDE
knetfilter – GUI for configuring the 2.4 kernel IP Tables
libabz0 – Miscellaneous useful routines
libiptables-ipv4-ipqueue-perl – Perl extension for libipq
lokkit – basic interactive firewall configuration tool (console interface)
netscript-2.4 – Linux 2.4.x (and 2.6.x) router/firewall network configuration system
netstat-nat – A tool that display NAT connections
openvpn – Virtual Private Network daemon
p3scan – transparent POP3-proxy with virus- and spam-scanning
psad – The Port Scan Attack Detector
pyroman – Firewall configuration tool for complex networks
reaim – Enable AIM and MSN file transfer on Linux iptables based NAT
shorewall-doc – documentation for Shorewall firewall
shorewall-lite – Shorewall (lite version), a high-level tool for configuring Netfilter
uif – Advanced iptables-firewall script
ulogd – The Netfilter Userspace Logging Daemon
uruk – Very small firewall script, for configuring iptables
wflogs – The modular firewall log analyzer of the WallFire project
fireflier-client-gtk – Interactive firewall rule creation tool – GTK client
fireflier-client-kde – Interactive firewall rule creation tool – QT client
fireflier-client-qt – Interactive firewall rule creation tool – QT client
fireflier-server – Interactive firewall rule creation tool – server
iptables – administration tools for packet filtering and NAT
iptables-dev – development files for iptable’s libipq and libiptc
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