popular firewalls

There are some problems that often make users confused: in terms of product functions, the descriptions of various vendors are very similar, and some "coming soon" are extremely similar to well-known brands. How can we identify this situation? Similar Products are described. Even for the same function, individual differences are obvious in terms of implementation, availability, and ease of use. I. Access Control at the network layer All firewalls must

Firewalls in the campus have been considered a dark and profound, few have the courage to carry out the planned experiment, basically this handout can also be used as a test report to read, is the author uphold I do not go to hell, who into the spirit of hell, risking their lives dangerous, reckless out of the results, but also by this, Hope to drive domestic capacity higher than the author many of the Masters, together to carry out the benefit of cam

The network firewall plays an important role in the security protection, but we should also see its deficiencies. Today, knowledgeable hackers can use the network firewall open ports, cleverly escaped the network firewall monitoring, directly targeted applications. They come up with complicated Attack methods that can bypass traditional network firewalls. According to expert statistics, 70% of the current attack is occurring in the application layer

Firewall has become a key part of enterprise network construction. However, many users think that there are already routers in the network and some simple packet filtering functions can be implemented. So why should we use firewalls? The following is a security comparison between the NetEye firewall and the most widely used and representative Cisco router in the industry. We will explain why a user's network includes a router and a firewall. One or tw

Iptables implements network firewalls: SNAT, DNAT, and iptablessnatIptables network firewall (2)-Introduction to SNAT and DNAT ?? In the previous article, we briefly introduced the basic concepts of the firewall in the LINUX kernel, as well as the four-table-five-chain knowledge. For more information, see Introduction to the LINUX firewall. It also introduces how to set up a simple network firewall that can filter protocols and ports in a Linux enviro

The Cisco router has a very high market demand. Here we mainly introduce the background of Cisco router and firewall. Firewall has become a key part of enterprise network construction. However, many users think that Cisco routers already exist in the network and some simple packet filtering functions can be implemented. So why should we use firewalls? The following is a security comparison between the NetEye firewall and the most widely used and repre

by the service access rules, authentication tools, packet filtering and application Gateway 4 components, All data and information passing through this wall is filtered for purpose, creating a secure gateway between the Internet and the intranet to protect the intranet from unauthorized users.Large-scale financial institutions, large-scale knowledge database and so on the information security requirements of enterprises have a sense of data protection, and small and medium-sized enterprises due

Disable the CentOS 6 and CentOS 7 firewalls. CentOS6.5 view the Firewall Status: 1 [Linuxidc @ localhost ~] $ Service iptable status Display result: 1 2 3 4 5 [Linuxidc @ localhost ~] $ Service iptable status Redirecting to/bin/systemctl status iptable. service ● iptable. service Loaded: not-found (Reason: No such file or directory) Active: inactive (dead) -- indicates that the firewall has been disabled Disable fir

classification1) Packet filteringAnalyze IP and port, whether Mac conforms to rules, if compliant, acceptBy source port, source IP, source Mac, package specific tag and directory port, Ip,mac to determine whether the packet can pass through the firewall2) Proxy Server3 Firewall Restrictions1) firewall does not effectively prevent viruses and trojans2) Firewalls do not normally set internal access rules, so they are not valid for internal attacks4 Fir

2. Common Linux CommandsMkdir CreateRM-RF DeleteChmod-r 777 PermissionsMysql-uroot-rQuit quittingFind/-name SVN lookup location3. Turn off the firewall and SELinuxRedhat uses SELinux to enhance security and shuts down by:1. Permanent effectModify the Selinux= "" in the/etc/selinux/config file to Disabled, and then restart.2. Immediate effectSetenforce 0The way to turn off the firewall is:1. Permanent entry into forceOpen: Chkconfig iptables onOFF: Chkconfig iptables off2. Immediate effect, failu

UFW is all called uncomplicated Firewall, and is a tool for configuring iptables Firewalls on Ubuntu systems. UFW provides a very friendly command for creating firewall rules based on IPV4,IPV6 . However,UFW is no interface, that is, with the command of that kind, so, the operation is not so convenient, someone helped it to write an interface, the name is called "gufw".Because the iptables under Ubuntu are more complex to operate and have more depende

With the development of firewall technology, the firewall with high security, easy operation and friendly interface has become a hot spot in the market gradually. In this case, it can greatly simplify the firewall settings, improve security performance of transparent mode and transparent agent is a measure of product performance is an important indicator. So in the process of recommending products, many manufacturers often introduce their own products to achieve transparent mode and transparent

The number of concurrent connections refers to the ability of a firewall or proxy server to handle its business information flow, is the maximum number of point-to-point connections that a firewall can handle at the same time, reflecting the ability of the firewall device to access and link state tracking for multiple connections, and the size of this parameter directly affects the maximum amount of information that the firewall can support. The number of concurrent connections is an important i

DoS (Denial of service denial-of-service) and DDoS (distributed denial of service distributed Denial-of-service) attacks are one of the security threats to large Web sites and network servers. The attacks on Yahoo, Amazon and CNN in February 2000 were carved into the history of major security events. Because of its good attacking effect, SYN Flood has become the most popular DOS and DDoS attack method at present. SYN flood uses TCP protocol flaw to s

It has always been a dream: How nice it would be to discover some vulnerabilities or bugs! So I am studying Computer blind and blind all day. What do I study? Study how to break through the firewall (the firewall here refers to a software-based personal firewall, and the hardware is not conditional .) Hey, you don't have to mention it. I did not have a white research, but I have even discovered common faults in most firewalls. This BUG can fool the fi

1. Packet filter Firewall2, Proxy-type firewall3. State Detection FirewallSpecific Description:1, packet filtering firewall uses the specific rules defined to filter the packet, the firewall directly obtains the packet IP source address, the destination address, the TCP/UDP source port and the TCP/UDP destination port.Use some or all of the above information to compare by fraud rules, filtering packets through the firewall. The rules are defined according to the characteristics of IP packets, wh