Skynet Firewall (SkyNet-FireWall) Personal Edition (referred to as Skynet firewall) is a laboratory created by the Skynet security for personal computers using the network security procedures.It is based on the system administrator to set security rules (Security Rules) guard the network, providing strong access control, authentication, application of gating, Network Address Translation (Network Address Translation), information filtering, virtual private network (VPN), trafficcontrol, virtual bridges and other functions.It can help you resist the network intrusion and attacks, prevent information leakage, and with the Skynet Security Lab website (WWW.SKY.NET.CN) match, according to information on suspected attacks, to find the attacker.Skynet firewall the network into the local network and the Internet can come from different networks for information, to set different security program, which is suitable for any dial-up Internet users, but also for Internet sharing software through the network users.The latest version is 2.47 official version.

Well-known computer security firewall is an important safeguard, so the firewall settings in RHEL 5 is also very, very want to, it is also important because it is so important and here to this tedious bit RHEL 5 firewall settings in detaildescription.

【REVIEW】 Colin Crook own experience how to deal with security attacks, the company made advice.

Introduction of a firewall

A firewall is a feature that makes the internal network and external network or Internet isolated from each other in order to protect the internal network or host.Simple firewall can be Router, 3 Layer Switch the ACL (access control list) to act as, a host can also be used, or even a subnet to achieve.Complex can buy specialized hardware firewall or software firewall to achieve.

In accordance with the firewall between internal and external data processing method, the firewall can be divided into packet filtering firewall and application layer firewall, packet filtering firewall work in the network layer, it is only detect packets of data packet header to rule, it runs fast but can notagreement on the high-level inspection, application layer firewalls can be forwarded to the high-level data and enforce authentication and filtering, but the service needs to provide agents with different applications and has established a network bottlenecks; and the packet filtering technology and a variety of applicationstechnology to integrate together to form composite firewall firewall product is currently a feature of the firewall is the mainstream technology for future development.

Light in the server security technology, network security technology, and have a profound accumulation.From development server starts, the dawn began the development of security technology, fleet monitoring systems, intrusion detection systems, firewall systems gradually come out.Recently, the dawn of China launched its first independent intellectual property rights based on the Godson processors, network security products - the dawn of TLFW-100L firewall.

According to statistics, in the event of all hacker attacks, SYN attacks are the most common and easiest to use an attack approach.I believe many people still remember the 2000 attack on YAHOO website example, when hackers use is simple and effective SYN attacks, some network worm with SYN attacks cause more damage.This article describes the basic principles of SYN attacks, tools, and methods, and fully explore the SYN attack protection technology.

Kaspersky Lab to remind the user to note the recent use of Microsoft Office's PowerPoint components of network attack vulnerability.

Website of the Ministry of Information Industry reported that Vice Minister of Ministry of Information Industry, Xi Guohua, deputy party secretary recently told "Guangming Daily" reporters, said: "Through a period of exploration, we recognize that in the future to establish a long-term fight against Internet pornographymechanism to work hard, and gradually establish and improve information security management system. "

Sendmail as a free mail server software, has been widely used in Internet servers of various operating systems.Such as: Solaris, HPUX, AIX, IRIX, Linux and so on.With the popularity of the Internet, mail server attack opportunities also increased significantly.

Windows network always be hackers and other saboteurs target.But once the administrator logs on a regular basis through the firewall to understand network status information, spoilers difficult succeeded.

Currently appearing on the market, "says security" implementation principle can be divided into two categories: one is Trend Micro in May 2008 launched the "Secure Cloud (cloud Safety)" technology.This is a Web reputation service to (WRS), e-mail reputation services (ERS) and file reputation service (FRS) as the infrastructure in the cloud client security framework, through the virus signature file to the Internet cloud database, thusmaintain a minimum number of thin clients for authentication.In other words, Trend Micro technology is based on its huge server farms and parallel processing capabilities, the framework of a large group of black and white list server for the client query, the Web threat reaches the end user or corporate network that their priorintercept.

May 4, according to Rising sources, audio and video software storm exposed serious security vulnerabilities that hackers could exploit the vulnerability remotely control Windows machines.At present, the use and mount the Trojan site is currently Storm video has not yet issued a patch.

Windows system, users should know that a lot of hacking systems, chicken, etc. with the system set the Guest account (Guest) are not unrelated.To address this issue, disable the guest account was the method used to achieve the hackers "access" purposes.

I believe that whenever there is exposure to hackers or security in this area friends, must have come into contact with overflow attack or contact with this type of word, that is, with overflow attacks, and overflow released by the masters program, only so much"fast food hackers."

With the popularity of e-business applications, various industries on the Internet opening up for business, payment of fees, and even the release of information on business operations has been getting closer and closer to us, e-commerce, electronic banking, and so a variety of Internet-based businesscommencement of business is in full swing.Operators in the highly competitive market, the lowest in the operation and maintenance costs into the case, make full use of existing resources operators, for broad customer base to provide more flexible services are gradually attracted major operatorsattention.

"Addicted to technology, people do not understand the power of the media, trail (a pseudonym), the first reaction was quite surprised." September 13, after a long effort, the reporter was removed link to "Baidu hacking" event in a person familiar.

Hackers to launch phishing attacks using Twitter

Beijing on Jan. 4, according to foreign media reports, has micro-blog site Twitter to remind the user has recently hackers cheat by using false Twitte login page user login information.

There are some issues that users often confused: the function of the product on a very similar description of the various vendors, a number of "rising star" and the well-known brands are very similar.Faced with this situation, how to identify? Described very similar products, even if the same function, in the concrete realization, in the availability and ease of use, individual differences are very obvious.

With the computer more and more deeply into the lives of ordinary users, the work in there, only professionals will encounter problems such as configuration of small (family) network, is now a normal user will often encounter.Windows family of operating systems has been known for ease of use, would have complicated the task of trying to make a simple operation to complete.But sometimes, ease of use and security are conflicting; the same time, the widespread use of the network, each PC is actually an Internet node Internet, security is every user must be of concern.As the latest version of Windows XP, of course, the easiest to use operating system; the other hand, in order to improve the ease of use with the default setting has brought many a security risk.

After installation run the following shows the main interface of Kaspersky, the main green tone, very beautiful, very stable:

A researcher from abroad, Adobe Acrobat Reader found zero-day exploits hackers started to become real goals.According to security experts Dr. Shi Xiaohong 360 introduced a number of carefully constructed malicious PDF document is already in the United States and other countries on the Internet, when users open these documents, the computer will automatically run Ghost Trojan remote control class, thus allowing a remote hacker"Chicken."

E-tickets have more than one month, the sales agent e-ticket sales rate has been as high as 90%.Yesterday, the reporter interviewed a number of well-known ticket agency, found in e-ticket to bring convenience to passengers, but also exposed some "vulnerabilities."

The connection is usually in the form of communication is non-encrypted communication on the network, which may be illegally tapping into, especially for authentication password information.To avoid this security vulnerability, it must be encrypted during transmission.

First, the common practice of computer network attacks

Development of the Internet has, in addition to the prosperity of its surface, but also there are some negative phenomena, of which the majority of hacking is the most Internet users headaches, it is the main threat to computer network security.The following analysis focuses on the network hacker attacks, several common practices and preventive measures.