How to configure highly available network security auditing on Linux

How to configure high-availability network security auditing on Linux

Introduction:
In the context of the current severe information security situation, network security auditing has become an important link. It can collect and Analyze traffic data in the network, monitor network usage, discover and prevent network attacks, and ensure network security and stability. At the same time, in order to cope with large-scale network traffic and data processing requirements, we need to configure a highly available network security audit system. This article will introduce how to configure high-availability network security auditing on Linux systems from the following aspects.

1. Build a Linux environment

First of all, we need to build a stable and reliable Linux environment. On Linux, you can choose to use common Linux distributions such as CentOS and Ubuntu. The following examples use CentOS as an example.

1. Install the CentOS operating system

First, download the image file of the CentOS operating system and install the system using a USB disk or virtual machine. After the installation is complete, make sure the system version is the latest and update the system packages.

2. Install necessary software packages

After installing the CentOS operating system, we need to install some necessary software packages, such as snort, suricata, tcpdump, etc. It can be installed through the following command:

sudo yum install snort suricata tcpdump

3. Configure the network environment

In network security audit, we need to ensure the reachability of the network. Therefore, the correct network environment needs to be configured. You can configure the network environment through the following command:

sudo ifconfig eth0 192.168.1.10 netmask 255.255.255.0

Among them, eth0 represents the network card name, and 192.168.1.10 represents the host IP address.

2. Configure a highly available network security audit system

After setting up the Linux environment, we need to configure a highly available network security audit system. The following examples use snort as an example.

1. Installation and configuration of snort

First, we need to install snort and configure its related rules. It can be installed through the following command:

sudo yum install snort

After the installation is completed, we need to download the latest rule set and configure snort.conf. You can download the rule set through the following command:

wget https://www.snort.org/rules/community -O snort.rules.tar.gz
tar -xvzf snort.rules.tar.gz -C /etc/snort/rules/

Then, edit the snort.conf file and add the rule set path:

sudo vi /etc/snort/snort.conf
# 添加以下内容
include $RULE_PATH/snort.rules

2. Configure snort cluster

In order to achieve high availability, we need to configure a snort cluster. It can be configured through the following steps:

First, add all hosts in the cluster to the same network and ensure normal communication between them.

Then, configure the snort.conf file on each host to enable the cluster function:

sudo vi /etc/snort/snort.conf
# 添加以下内容
config cluster: mac eth1

Among them, eth1 represents the name of the network card for cluster communication.

Finally, restart the snort service and execute the following commands on each host:

sudo systemctl restart snort

3. Implement network security audit

After configuring high-availability network security audit After installing the system, we can start the network security audit work. The following examples use snort as an example.

1. Start snort

First, we need to start the snort service. It can be started with the following command:

sudo systemctl start snort

2. Monitor network traffic

snort can monitor network traffic in real time and detect malicious activity based on a predefined set of rules. Traffic can be monitored through the following command:

sudo snort -i eth0 -c /etc/snort/snort.conf

Among them, eth0 represents the name of the network card that needs to be monitored.

3. Analyze audit results

snort will write the detected malicious activities to the log file. We can view the log through the following command:

sudo tail -f /var/log/snort/alert

where /var/log/snort/alert is the log file path.

Summary:
This article introduces how to configure a highly available network security audit system on a Linux system. By building a Linux environment and configuring the necessary software packages and network environment, we can build a stable and reliable basic environment. Then, by installing and configuring tools such as snort, we can achieve high-availability network security auditing. Finally, we can start the snort service, monitor network traffic, and analyze the audit results. Only by properly configuring a highly available network security audit system can we better detect and prevent network attacks and ensure the security and stability of the network.

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