Application Policy Routing in Linux Firewall

Assume that the network has two external interfaces: eth0 172.16.1.1/24, eth1 10.0.0.1/24, and eth2 192.168.1.1. Now we have designed such a policy to export all the web service data from the internal network to 172.16.1.1. Other data goes to the

Comprehensive Analysis and troubleshooting of switching network faults

We once introduced an article on how to select a network troubleshooting method, and introduced three network troubleshooting methods. Here we will repeat the topic to help you troubleshoot network faults through specific instances. Before getting

11 tips for preventing Linux security (1)

Thanks to the excellent network functions of the Linux operating system, most website servers on the Internet use Linux as the main operating system. However, because the operating system is a multi-user operating system, Hackers often choose Linux

Preliminary security settings for Linux (1)

Not long ago, I downloaded the latest kernel version with great patience, but it was done through the dial-in connection. Throughout the download process, I am eager to use high-speed Internet connections at home one day. The arrival of xDSL and

Use iptables to set some security protection functions (2)

Below are some simple rules for setting iptables. For more information, see. (It has nothing to do with NAT)# Mount related modules modprobe ip_tablesmodprobe ip_conntrackmodprobe ip_conntrack_ftpmodprobe ip_conntrack_irc # Resetting

Linux-based Router and firewall configuration

Currently. Network Operating System Linux has become the operating system of computer technology professionals. Through simple installation, technicians can obtain multiple network services provided by Linux, such as Domain Name Service, email,

Install WSUS patches for LAN upgrade servers

What will happen if the OS Patch Is Not Installed in time? The shock wave and shock wave must have been learned by everyone. Therefore, timely updates of operating system vulnerability patches have become the main means to improve system

In-depth analysis of Linux security reinforcement (1)

Linux system security cannot be ignored. However, system reinforcement is not very easy. The author briefly introduces the in-depth security reinforcement for Linux systems.Deep security reinforcement for Linux systemsAuthor: ayazero

Check whether a simple Trojan exists in the system.

How can I check if a system contains a trojan? Here, we only illustrate some simple Trojans:1. Start the task manager and check whether there are any unfamiliar processes. Record them and do not touch them for the time being.2. Start the Registry

Linux backdoor technology and practices (1)

Backdoor IntroductionA technology used to facilitate next entry after intruders fully control the system.You can modify the system configuration file and install a third-party backdoor tool. It is concealed and can bypass system logs and is not

Introduction to Linux File System Reverse deletion (1)

As a multi-user, multi-task operating system, once the files in Linux are deleted, it is difficult to restore. Although the DELETE command only marks the deletion in the file node and does not actually clear the file content, other users and some

How to handle Linux File System corruption

When the file system is damaged, if the ext2fs file system is used, you can run the e2fsck command from the floppy disk to correct corrupted data in the file system. For other types of file systems, you can use the corresponding fsck command. When

Enhanced DNS Security: BIND can be run under Chroot

Running BIND on chroot improves security. This article has been tested on Debian Sarge. You can modify other versions as needed.If you have not installed BIND, run the following command to install Bind 9. Code:apt-get install bind9

Preliminary Report on cross-file query vulnerability of access Database

I. I did not intend to discover this vulnerability when I was playing SQL injection:1. Access http://www.lznet.net/news/displaynews.asp? Id = 24794'Page error information:Microsoft ole db Provider for ODBC Drivers error '80040e14'[Microsoft] [ODBC

Be careful with blog comments and online emails with malicious code

Secure Computing warns that blogs, message boards, and online emails are currently being compromised by junk information that invites people to watch "funny" videos. Secure Computing found a website containing a variant of the Storm worm. The worm

Conventional WEB site intrusion methods

Web intrusion workflow: Collect intelligence, remote attacks, remote logon, obtain WEBSHELL, obtain common user permissions, obtain super user permissions, leave backdoors, and clear logs. The main content includes target analysis, document

Xwork vulnerability fixing tragedy (1)

In the POC released by the Vulnerability discoverer, versions earlier than xwork 2.1.2 cannot be affected (versions earlier than this version are collectively referred to as the old version and later versions are called the new version ), for

Reference case: manually injecting a colorful online website into Oracle (1)

A lottery online website is a large lottery site with an injection point. The link is as follows: http: // www. ***** china.com/jst/md_end.jsp? Id = 76. This injection point is used as an example to explain how to perform manual Oracle injection

Preventing website Trojans: focusing on auditing and monitoring

WebsiteAppearsTrojanThe main cause is system, firewall, or website application vulnerabilities. The Network Administrator is responsible for reviewing the website and maintaining the normal operation of the website. From the perspective of the

Web vulnerabilities: Various injection and attacks (1)

With the birth of a series of new Internet products such as Web2.0, social networks, and Weibo, the Web-based Internet applications are becoming more and more extensive. In the process of enterprise informatization, various applications are deployed

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