Is there a real and effective defense against DDoS attacks?

1. The use of high-performance network equipment should first ensure that network equipment can not become a bottleneck, so when choosing routers, switches, hardware firewalls and other equipment, we should try to choose products with high visibility and good reputation. It is also better if you have a special relationship or agreement with the network provider, and when a large number of attacks occur, it is very effective to ask them to do a traffic limit at the network contact point to combat certain types of DDoS attacks.

2. Try to avoid the use of NAT, whether it is a router or a hardware wall device, try to avoid the use of network address translation NAT, because the use of this technology will greatly reduce the network communication capability, in fact, the reason is very simple, because NAT needs to convert the address back and forth, and the checksum of the network packet needs to be calculated during the conversion process, so a lot of CPU time is wasted, but sometimes NAT must be used, then there is no good way.

3. Sufficient network bandwidth to ensure that the network bandwidth directly determines the ability to resist attacks, if there is only 10M bandwidth, no matter what measures are taken, it is difficult to resist today's synflood attacks, at least 100M shared bandwidth should be selected, and the best is of course hung on the 1000M backbone. However, it should be noted that the network card on the host is 1000m, which does not mean that its network bandwidth is gigabit, if it is connected to a 100m switch, its actual bandwidth will not exceed 100m, and then it is connected to a 100m bandwidth, which does not mean that there is a 100m bandwidth, because the network service provider is likely to limit the actual bandwidth to 10m on the switch, which must be clarified.

4. Find a professional network security protection company such as Ruisu Cloud to set up a defense system for you, Ruisu Cloud can block DDoS and CC attacks without the need for customers to migrate the computer room, realize DDoS cloud protection cleaning, and effectively resist CC attacks; It supports HTTPS and the latest HTTP 2 protocol, HTTPS full-link support, T-level super protection capability, the latest self-developed fingerprint recognition architecture WAF firewall, provides 1T ultra-large protection bandwidth, and the maximum single IP protection capacity can reach hundreds of G, ultra-large broadband, and can calmly deal with ultra-large traffic attacks. Comprehensively protect the servers of gaming enterprises, build network defense deployments preventively, and eliminate network security risks.

If it is attacked, you can replace the access of ** with cname, and the domain name resolution protection system can achieve the protection effect. Or you can use Hangzhou Super Shield similar to the shield of this kind of soft defense, let the protective shield resist the attack, a good protective shield is basically not dead, you can search for some soft defense tools about defending DDoS and defending against CC attacks.

A complete DDoS attack system consists of four parts: the attacker, the main control end, the ** end, and the attack target. The master and ** side are used to control and actually launch attacks, respectively, where the master only issues commands and does not participate in the actual attack, and the ** side sends out the actual attack packets of DDoS.

Each attacking host sends a large number of service request packets to the target host, which are disguised to make it impossible to identify it, and the services requested by these packets often consume a large amount of system resources, causing the target host to be unable to provide normal services to the user. It even leads to a system crash.

Defense methods: 1. Design the network security system comprehensively and comprehensively, and pay attention to the security products and network equipment used.

2. Improve the quality of network management personnel, pay attention to security information, comply with relevant security measures, upgrade the system in a timely manner, and strengthen the system's ability to resist attacks.

3. Install a firewall system in the system, use the firewall system to filter all incoming and outgoing data packets, check the border security rules, and ensure that the output packets are correctly restricted.

4. Optimize routing and network structure. Set up your router properly to reduce the possibility of an attack.

5. Install intrusion detection tools (such as nipc, ngrep), scan and check the system frequently, solve the vulnerabilities of the system, encrypt system files and applications, and regularly check for changes in these files.

Prevention depends on the server operator to deal with the target object, which is not technically difficult, but the difficulty lies in the transformation of resource advantages.

1. Ensure that there are no vulnerabilities in the server software to prevent attackers from intruding. Make sure your servers are up-to-date and patched with security patches and that there are no security vulnerabilities. Delete unused services from the server and close unused ports.

2. Hide the real IP of the server. Add CDN relay to the frontend of the server, or purchase a shield machine of Anti-DDoS Pro to hide the real IP address of the server, and use the IP address of the CDN for domain name resolution, and use the IP address of the CDN for all subdomain names for resolution. In addition, other domain names deployed on the server cannot be resolved using real IP addresses, and all of them are resolved using CDNs.

3. Prevent the server from leaking IP addresses when transmitting information to the outside world. If the server cannot use the send email function, because the email header will reveal the IP address of the server, the email can be sent through a third party**.

4. Optimize routing and network structure. Set up your router properly to reduce the possibility of an attack. Optimize the hosts that provide services to the outside world, and restrict all hosts that provide public services on the Internet.

5. Start from the source. Do a good job in the protection of personal computers and Internet of Things devices, do not arbitrarily ** unsolicited applications, regularly update security patches, and close unnecessary ports to prevent devices from being maliciously connected and turning into broilers.

Protection against DDoS attacks.

To prevent DDoS attacks, we can take the following measures:

Increase network bandwidth: DDoS attacks are designed to consume the network bandwidth of the target system, so increasing the network bandwidth can mitigate this attack. However, this is only a short-term solution, as attackers can continue to increase their attack traffic.

Use firewalls and intrusion prevention systems: Firewalls and intrusion prevention systems can detect and block DDoS attack traffic, as well as control inbound and outbound traffic. Firewalls can be configured to restrict network traffic and block traffic from unknown sources.

Use load balancers: Load balancers can spread traffic across multiple servers, spreading attack traffic and mitigating the impact of attacks.

Restrict IP addresses and port numbers: Restricting IP addresses and port numbers prevents attackers from sending forged IP addresses and port numbers, thus preventing the target system from DDoS attacks. This can be achieved through network devices such as firewalls, intrusion prevention systems, and routers.

Employ traffic filters: Traffic filters can detect and block DDoS attack traffic and filter out traffic that is not relevant to the target system. Traffic filters can be placed at the edge of the network or inside the network to control the flow of traffic entering and leaving the network.

Use a CDN (Content Delivery Network): A CDN is a service that distributes content to multiple nodes around the world, caching and distributing static content (such as text, content, and text). CDNs can help mitigate the impact of DDoS attacks on targeted systems and improve performance and availability.

Update systems and applications: Regularly updating systems and applications can patch known vulnerabilities and security issues and enhance the security of your system. This reduces the risk of DDoS attacks and makes the system more secure and reliable.

Establish an emergency response plan: Establishing an emergency response plan can help organizations respond to DDoS attacks and other cybersecurity incidents. An emergency response plan should include steps such as assessing risks, establishing alarm mechanisms, investigating and analyzing incidents, fixing vulnerabilities, and recovering systems.

DDoS attacks are a common type of cyberattack that can have a significant impact on applications such as web services,**, e-commerce, and financial transactions. To prevent DDoS attacks, a range of measures can be taken, including increasing network bandwidth, using firewalls and intrusion prevention systems, using load balancers, restricting IP addresses and port numbers, employing traffic filters, using CDNs, updating systems and applications, establishing emergency response plans, and more. These measures can help organizations improve their network security and reduce the risk of DDoS attacks.

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To defend against distributed denial-of-service attacks (DDoS), you can take the following measures:

Use hardware appliances and software solutions: such as firewalls, intrusion detection systems (IDS), intrusion prevention systems (IPS), load balancers, reverse servers, etc. These hardware appliances and software solutions can help defend against DDoS attacks, restrict access to servers, and ease the stress of attacks.

Configure network rules and parameters, such as traffic filtering, IP blacklists, limits on the number of large and small connections, and session tracing. These rules and parameters can mitigate the impact of DDoS attacks to some extent and reduce the threat to attackers.

Have spare resources ready: such as spare servers, available bandwidth, cloud storage, and more. In the event of a DDoS attack, traffic can be diverted to an alternate server to ensure business continuity.

Work with third-party service providers, such as CDNs (Content Delivery Networks) and cloud security providers. These service providers have a wealth of experience and high-end technology to provide users with strong DDoS defenses.

Improve cyber security awareness: Conduct regular employee training and security drills to enhance employees' awareness of and response to DDoS attacks.

DDoS attack is a distributed denial-of-service attack, which refers to the use of client server technology to unite multiple computers as an attack platform to launch a DDoS attack on one or more targets, which can paralyze the target server.

To put it simply, your stall sells salted duck eggs, and I find a bunch of second-rate people to ask questions around your salted duck egg stall, but they don't buy anything, or they buy something, and they say that salted duck eggs are not good to return. Make it impossible for people who really want to buy salted duck eggs to buy them, so that your family's normal business cannot be carried out.

Defense: 1. Load the latest patches on the system as much as possible, and take effective compliance configurations to reduce the risk of vulnerability exploitation;

2. Adopt appropriate security domain division, configure firewalls, intrusion detection and prevention systems, and mitigate attacks.

3. Adopt reliability measures such as distributed networking, load balancing, and improving system capacity to enhance overall service capabilities. In layman's terms, I asked the security guard to help me maintain the order of the duck egg stall, I didn't look like a good person, behaved weirdly and didn't let me get close at all, and drew a line in front of the duck egg stall to line up, everyone could only have half a minute to buy duck eggs, and open a few more windows to sell duck eggs.

The principle is to exploit the vulnerabilities of the Internet Protocol to cause distributed denial of service, and effective preventive measures include firewall function peak processing and network bandwidth configuration improvement.

What are the types of DDoS attacks?

DDoS attacks use a large number of legitimate requests to consume a large amount of network resources to achieve the purpose of paralyzing the network. The specific attack methods can be divided into the following types:

2. Overload the server by submitting a large number of requests to the server;

3. Block a user from accessing the server;

4. Block the communication between a service and a specific system or individual.

How Do I Defend Against DDoS Attacks?

Anti-DDoS Pro server.

Anti-DDoS Pro servers mainly refer to servers that can independently defend against more than 50Gbps, which can help with denial-of-service attacks, regularly scan network master nodes, etc. It's equivalent to hiring a few tall and tall big men to stand at the door of the dumpling shop, and as soon as those little hooligans come over, they will beat them away.

The blacklist adheres to the strategy of "I'd rather kill a thousand by mistake than let go of one", and rejects the hooligans who have come to the store to harass them, and even people who look alike, forming a blacklist of past attacks to minimize the possibility of repeated attacks.

DDoS cleaning.

Weike Cloud DDoS cleaningIt is to monitor the user's request data, find abnormal traffic, and clean this part of the traffic without affecting the business. It's like I observe the customers in the store, and if you sit for a long time and don't order dumplings, you kick him out.

CDN acceleration.

Weike Cloud CDN accelerationThe content of ** is cached at the edge of the network (the place closest to the user's access network), and then when the user accesses the ** content, the user's request is routed or directed to the cache server that is closest to the user's access network or has the best access effect through the scheduling system, and the cache server provides the content service for the user; Compared with direct access to the origin server, this method shortens the network distance between users and content, thus achieving the effect of acceleration. That is, the CDN service distributes the access traffic to each node, so that on the one hand, the real IP of ** is hidden, and on the other hand, even if it encounters a DDoS attack, the traffic can be distributed to each node to prevent the origin server from crashing. It's like if I made the dumpling shop online, only delivering takeout and home delivery, even if the little hooligans came to the store, they were helpless.