As the means of DDOS attacks are becoming more and more complicated, there are more and more hidden dangers in Internet security. The webmaster hopes that the website will continue to run and rented high -defense servers. High -defense servers mainly pass the firewall, data detection traction system, etc. Technology to effectively weaken traffic attacks, so what are the types of high -defense server firewalls?

　　1. Data packet screening firewall

　　Data packet screening firewalls are the most common type of high -defense server firewalls in the United States. By checking the data packets and not matching them with the establishment of the established security rules, they are prohibited. This type of firewall will check the source IP address and target IP address of the data packet. If the data packet matchs the allowable rules of the firewall, you can trust the US high -defense server network.

　　2. Pack the filtering firewall

　　The US high -defense server package filtering firewall is divided into two categories: state and no state. Performing the data packet inspection independently without a state firewall will lack the context, so it may become the goal of hackers. On the contrary, a state firewall will remember information about the data packets that previously passed on, so it is considered safer.

　　Although the high -defense server package filtering firewall can effectively provide basic protection, and it may be very limited. For example, they cannot determine whether the request content being sent will adversely affect the application. If the malicious request allowed from the trusted source address will cause the firewall to be known, such as the database deletion.

　　3. The next -generation firewall

　　The next -generation firewall is a type of combining traditional US high -defense server firewall technology with other functions, such as encrypted traffic checks, invasion of defense systems, anti -virus, etc., and also includes in -depth packaging DPI. Because deep data packets check the data in the data packet itself, users of US high -defense server users can more effectively identify, classify, or prevent data packets with malicious data.

　　4. Agent firewall

　　Different from the basic firewall in the US high -defense server application level, different from the basic firewall. The agent firewall acts as the intermediary between the two terminal systems. The client must send the request to the US high -defense server firewall. Evaluate, then allow or prevent the request. In addition, the agent firewall monitor the 7th layer protocol, such as the traffic of HTTP and FTP, and use the status and depth data packet inspection to detect malicious traffic.

　　5. Network address conversion NAT firewall

　　This type of firewall allows multiple devices with independent network addresses to use a single IP address to connect to the network, thereby achieving a hidden state of each IP address. Therefore Higher security. The principle of NAT firewall is similar to the agent firewall. It is an intermediary between a set of US high -defense servers and external traffic.

　　6. Multi -layer inspection SMLI firewall

　　The transmission and application layers in the US high -defense server network filter data packets, and compare it with the known trusted data packets. Like the NGFW firewall, SMLI also checked the entire packet, and only allows them to pass only when the packets pass through each layer, respectively. The firewall checks the US high -defense server data packet to determine the communication status and ensure that all of the launching communication is performed only with the trusted source.