tutorial - HowTo Hack/Sniff/Monitor Wireless Networks

Kismet is an 802.11 layer2 wireless network detector, sniffer, and intrusion detection system. Kismet will work with any wireless card which supports raw monitoring (rfmon) mode, and can sniff 802.11b, 802.11a, and 802.11g traffic.

Kismet identifies networks by passively collecting packets and detecting standard named networks, detecting (and given time, decloaking) hidden networks, and infering the presence of nonbeaconing networks via data traffic.

Features

• Ethereal/Tcpdump compatible data logging
• Airsnort compatible weak-iv packet logging
• Network IP range detection
• Built-in channel hopping and multicard split channel hopping
• Hidden network SSID decloaking
• Graphical mapping of networks
• Client/Server architecture allows multiple clients to view a single
• Kismet server simultaneously
• Manufacturer and model identification of access points and clients
• Detection of known default access point configurations
• Runtime decoding of WEP packets for known networks
• Named pipe output for integration with other tools, such as a layer3 IDS like Snort
• Multiplexing of multiple simultaneous capture sources on a single Kismet instance
• Distributed remote drone sniffing
• XML output
• Over 20 supported card types

Download - Here

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source:http://linuxpoison.blogspot.com/2008/02/135781758015993.html

tutorial - How to block Brute Force Attacks (Password Hacking)

From the category of log based tools fail2ban is consider to be the best available log based brute force blocker. Basically, as any other log based brute force blockers, fail2ban will monitor the system log files and when certain configured events occur they will trigger fail2ban to block the offending host.

Here are the main features of fail2ban:

• running as daemon (no delay to take actions as in cron based tools).
• can use various methods to block the attack:
  • iptables (this is the default, and will most certainly be the best choice for most users)
  • TCP Wrappers (/etc/hosts.deny): this might be particular useful if you are running a VPS that has no access to iptables rules.
  • any other method you might need to implement in your firewall setup (you will have to define the rules yourself in this case).

• can handle more than one service: sshd (default), apache, vsftpd/proftpd, etc.
• can send e-mail notifications.
• can ban IPs for a limited amount of time and since 0.6.1 can also permanently ban hosts.

The installation is not at all complicated as the author provides packages for major linux distributions.

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source:http://linuxpoison.blogspot.com/2008/02/135781758019838.html