| Nessus |
The "Nessus"
Project aims to provide to the internet community a free, powerful,
up-to-date and easy to use remote security scanner for Linux, BSD,
Solaris, and other flavors of Unix. |
| Ethereal |
Ethereal is a free network
protocol analyzer for Unix and Windows. Ethereal has several
powerful features, including a rich display filter language and the
ability to view the reconstructed stream of a TCP session. |
| Snort |
Snort is an open source network
intrusion detection system, capable of performing real-time traffic
analysis and packet logging on IP networks. |
| Netcat |
Netcat has been dubbed the
network swiss army knife. It is a simple Unix utility which reads
and writes data across network connections, using TCP or UDP
protocol |
| TCPdump |
TCPdump is the most used network
sniffer/analyzer for UNIX. TCPTrace
analyzes the dump file format generated by TCPdump and other
applications. |
| Hping |
Hping is a command-line oriented
TCP/IP packet assembler/analyzer, kind of like the “ping”
program (but with a lot of extensions). |
| DNSiff |
DNSiff is a collection of tools
for network auditing and penetration testing. dsniff, filesnarf,
mailsnarf, msgsnarf, urlsnarf, and webspy passively monitor a
network for interesting data (passwords, e-mail, files, etc.). |
| GFI
LANguard |
GFI LANguard Network Security
Scanner (N.S.S.) automatically scans your entire network, IP by IP,
and plays the devil's advocate alerting you to security
vulnerabilities. |
| Ettercap |
Ettercap is a multipurpose
sniffer/interceptor/logger for switched LAN. It supports active and
passive dissection of many protocols (even ciphered ones)and
includes many feature for network and host analysis. |
| Nikto |
Nikto is an Open Source (GPL) web
server scanner which performs comprehensive tests against web
servers for multiple items, including over 2500 potentially
dangerous files/CGIs, versions on over 375 servers, and version
specific problems on over 230 servers. |
| John
the Ripper |
John the Ripper is a fast
password cracker, currently available for many flavors of Unix. |
| OpenSSH |
OpenSSH is a FREE version of the
SSH protocol suite of network connectivity tools, which encrypts all
traffic (including passwords) to effectively eliminate
eavesdropping, connection hijacking, and other network-level
attacks. |
| TripWire |
Tripwire is a tool that can be
used for data and program integrity assurance. |
| Kismet |
Kismet is an 802.11 wireless
network sniffer - this is different from a normal network sniffer
(such as Ethereal or tcpdump) because it separates and identifies
different wireless networks in the area. |
| NetFilter |
NetFilter and iptables are the
framework inside the Linux 2.4.x kernel which enables packet
filtering, network address translation (NAT) and other
packetmangling. |
| IP
Filter |
IP Filter is a software package
that can be used to provide network address translation (NAT) or
firewall services. |
| pf |
OpenBSD Packet Filter |
| fport |
fport identifys all open TCP/IP
and UDP ports and maps them to the owning application. |
| SAINT |
SAINT network vulnerability
assessment scanner detects vulnerabilities in your network's
security before they can be exploited. |
| OpenPGP |
OpenPGP is a non-proprietary
protocol for encrypting email using public key cryptography. It is
based on PGP as originally developed by Phil Zimmermann. |
TheNetworkAdministrator.com 
