With the spread of DDoS attacks on the Internet, it has become more difficult to defend against DDoS. With the continuous economic progress of e-commerce, many companies have their own servers. Servers are the core products of the network. The server technology is relatively complicated, especially in this virus-ridden Internet era. Security issues and whether to have an anti-attack The server is very prominent.
There are two main manifestations of DDoS. One is a traffic attack, which is mainly an attack against network bandwidth, that is, a large number of attack packets cause network bandwidth to be blocked, and legitimate network packets are flooded by fake attack packets and cannot reach the host; the other is The resource exhaustion attack is mainly an attack against the server host, that is, a large number of attack packets cause the host's memory to be exhausted or the CPU is occupied by the kernel and applications, resulting in the inability to provide network services.
DDoS attacks are very harmful and difficult to prevent. They can directly lead to website downtime, server paralysis, damage to authority, brand shame, and loss of property, which seriously threaten the development of Internet information security in China. Methods of defense against DDoS Generally companies usually implement one of the following three deployment modes, but in order to benefit from these methods and fully defend against multi-vector attacks, it is usually recommended that organizations adopt a hybrid deployment mode.
Proactive: The proactive deployment model always monitors incoming traffic and detects and mitigates it. Therefore, this is an extremely effective method for enterprises to place packet-based detection and mitigation equipment at the edge of the network.
Passive: In order to fully grasp the reactivity of the network traffic, the deployment mode uses flow-based data. It works by routing specific traffic to the mitigator, cleaning it up, and then redirecting it back to the network. This mode is the one most commonly provided by an ISP or cloud provider.
Hybrid: The hybrid deployment model uses on-demand cloud mitigation capabilities to respond to capacity attacks, as well as line and local packet-based solutions. These solutions are designed to detect and mitigate the three main types of DDoS attacks: capacity, network protocol, and application .
A DDoS attack is the ability to use a controlled machine to launch an attack on a machine, so that the attack is so fast that it is difficult to defend against the attack, and it is precisely this kind of attack that is very destructive and suffers from traffic attacks. During the period, effective DDoS defense measures include:
Measure 1: Set up a firewall
The firewall has a strong preventive effect on most of the visits. Although it does not mean that the firewall is 100% safe after it is set up, after the best firewall is set up, it can withstand most attacks.
Measure 2: Apply system patches
When we are doing server system security measures, we must first pay attention to the ambitions. Instead, we should start with the most basic work, which is to patch the system. No matter what operating system the server uses, there are certain vulnerabilities. Only by applying patches continuously can the vulnerability be exploited and attacked, which is the basis of security measures.
Measure 3: Use network equipment to protect network resources
Defending against DDoS attacks means that network devices are load-balanced devices such as routers and firewalls to effectively protect the network; when the network is attacked by hackers, the router is the first to be affected, and other devices are not affected; The router only needs to be restarted to resume normal use, and the router starts up very quickly, causing almost no loss; if the server equipment is affected, it will often cause data loss, and the server restart requires a long process Therefore, the loss caused is relatively large, and it is better to use load equipment.
Measure 4: Close unused service ports
You can choose to use some tools to close the services and ports that we don't use frequently, so as to avoid waste of resources and reduce security risks. These services and ports are easy to be used by hackers because they are not used for a long time, so they can launch attacks here, so close The advantages outweigh the disadvantages.
The above is the introduction of the server system security defense against DDoS attacks. If you want to improve security, then these measures need to be done. Enterprises should do a good job of self-examination first. A comprehensive and complete self-understanding is the foundation for enterprises to achieve server system security. At the same time, new technologies should be tried and accepted to significantly improve the detection and defense effects of new and unknown threats.
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