Real-time freight cost analysis

List of contents of this article:

• 1、< A href='#How to install Snort intrusion detection system on Real-time freight cost analysisUbuntu' title='How to install Snort intrusion detection system on Ubuntu'>How to install Snort intrusion detection system on Ubuntu
2. What is intrusion detection and the system structure of intrusion detection?
• 3, How to write detection rules of snort
• 4, What kind of commonly used intrusion detection systems? I know snort. What else? Give me a detailed introduction. _Bai...

How to install Snort intrusion detection system on Ubuntu

1. Detect whether snort really starts successfully . General steps to install meIf you do it, it won't work, because there is also a file (/var/log/snort/alert) owner who has not modified it.

2. Ubuntu series: apt-get install snort press, and then follow the prompts. Redhat series: yum install snort, and then follow the prompts to operate.

3. When setting ip, set it in the dialog box of ipv6, ubuntu supports ipv6. Then, check the check mark in front of "Use ipv6 to complete this connection", and remove the check mark of ipv4. If you have any questions, you can ask. I have been using ubuntu.

4. In this tutorial, I will demonstrate how to install and configure Suricata IDS on the Linux server. To install Suricata IDS on Linux, you might as well use the source code to build Suricata. You need to install a few required dependencies first, as shown below.

5. swap is a virtual memory file of Linux. When installed in Ubuntu, /dev/sda (your system) and swap areas will be divided by default. sda is generally in ext3 or ext4 format, and the swap area does not need to be formatted.

6. The first thing you should do is to install an intrusion detection system. Since Snort is the standard software package in Linux (which is also recommended by PacketFence), we will use this tool.

What is intrusion detection and the system structure of intrusion detection?

Intrusion detection is a reasonable supplement to the firewall. System structure composition of intrusion detection: event generator: its purpose is to obtain events from the entire computing environment and provide this event to other parts of the system.Event analyzer: It obtains data through analysis and produces analysis results.

Intrusion detection is a reasonable supplement to the firewall, helping the system deal with network attacks, expanding the security management capabilities of system administrators (including security auditing, monitoring, attack identification and response), and improving the integrity of the information security infrastructure.

Intrusion detection system (IDS) is a kind of security for real-time monitoring of network transmission. Unlike traditional network security equipment, when an alien intruder is detected, it will immediately call the police and take positive countermeasures.

Intrusion detection technology (IDS) can be defined as a system that identifies and handles the malicious use of computer and network resources accordingly.

How to write snort's detection rules

After installing snort, if you use the default installation path, open the C:snortrules directory, which is the snort rule directory, which can be used in notepa Open d++ or other editors.

Each rule of snort is divided into rule head and rule body.

The last rule is to modify the copy of the signature ID No. 499 to relax the alarm limit to meet our test purpose. Under normal circumstances, you should avoid relaxing the alarm limit, because this will cause a lot of false alarms.

Attaned, the default rule setting of Snort includes methods to detect CSS, but these are easy to avoid detection.For example, most of them are bypassed by heximal coding, such as %3C%73%63%72%69 %70%74%3E instead of avoiding detection. Relying on the ability of the levelofparanoia organization, we have written a variety of rules to detect the same attack.

snort.conf is a rule set file. Snort will match each package and rule set, and take corresponding actions when such packages are found. If you don't specify the output directory, snort will be output to the /var/log/snort directory. Note: If you want to use snort as your own intrusion detection system for a long time, you'd better not use the -v option.

If the first rule matches, the process sets the specific condition to exist in the stream.Now use the second rule to check whether the previous group meets the first condition. If the second rule matches, an alarm will be generated. It is possible to use flowbits many times in the rules and combine different functions.

What kind of commonly used intrusion detection systems? I know snort. What else? Give me a detailed introduction. _Bai...

1. Snort has three working modes: sniffer, packet recorder, and network intrusion detection system. The sniffer mode only reads packets from the network and displays them on the terminal as a continuous stream. The packet recorder mode records the packets on the hard disk.The network intrusion detection mode is the most complex and configurable.

2. Detection methods: abnormal intrusion detection and misuse intrusion detection. The intrusion detection system (abbreviated as "IDS") is a kind of network security device that monitors network transmission in real time and issues alarms or takes proactive response measures when suspicious transmissions are found.

3. Event generator: Its purpose is to obtain events from the entire computing environment and provide this event to other parts of the system. Event analyzer: It obtains data through analysis and produces analysis results.

4. The assumption of Anomaly detection is that the activity of the intruder is abnormal from that of the normal subject.

5. The most important use of Snort is still as a network intrusion detection system (NIDS). Introduction to use Snort is not a complicated and difficult software to operate. Snort can operate in three modes: Sniffer Mode: In this mode, Snort will retrieve packets in the existing domain and display them on the screen.

6. Intrusion detection system (IDS) is a security guarantee for real-time monitoring of network transmission. Unlike traditional network security equipment, when an alien intruder is detected, it will immediately call the police and take positive countermeasures.