How Do I Use IP Filtering to Defend Against DDoS Attacks?

DDoS attacks have been around for a long time, but such a simple and crude attack method is still effective today, and has become the "number one enemy" that plagues the stable operation of major major enterprises.

Anti-DDoS attacks should not be underestimated against one of the most effective means of IP filtering.

Defend against DDoS attacks with IP filtering.

Today, with the accelerated popularization of a large number of connected smart devices, these smart devices have been exposed to many security vulnerabilities and even become part of the DDoS attack army, just like the MiRai botnet attack that paralyzed half of the U.S. network.

However, it was rare for a networkable smart device to be used in a large-scale DDoS attack before the MIRAI source** was deliberately made public. However, the current situation has obviously changed dramatically after the disclosure of the mirai source**, and the botnet of unscrupulous hackers controlling networkable devices has rapidly expanded its scale and attack power. Once these devices or networks are compromised and used for malicious purposes, organizations will not be able to effectively protect against them.

At this time, if the enterprise deploys a gateway that can continuously monitor and actively filter IP addresses controlled by the botnet, and continuously update the database of bad IP addresses through linkage with threat intelligence, it will know which IP addresses have been controlled by the botnet or invaded by other malware.

When the traffic from these malicious IP addresses arrives at the gateway, Ruisu Cloud can automatically filter out the malicious traffic at a line rate of up to 10GB to prevent it from reaching the firewall, greatly improving the efficiency of the firewall and related security solutions. This minimizes the risk of attacks on the business by dramatically reducing the workload on perimeter protection tools such as firewalls and the network itself.

When defending against DDoS attacks, this IP filtering method can filter at least 1 3 malicious traffic, which can save a lot of investment costs for enterprise network protection and improve the overall defense capability of the network.

In addition, by filtering and blocking malicious IP addresses, it can also prevent those compromised devices in the enterprise network from communicating with the hacker's command and control center, preventing these devices from being used as a tool for other DDoS attacks**, and can also contain potential data leaks in time.

This is just a matter of repeating the login**.

The biggest difficulty of DDoS attacks is that the cost of the attack launched by the attacker is much lower than the cost of defense. For example, hackers can easily control a large number of puppet hosts to launch 10G and 100G attacks, and the cost of 10G and 100G bandwidth to defend against such attacks is many times the cost of the attack. Therefore, it is very unrealistic to increase the bandwidth of your own server to defend against DDoS.

In addition to increasing bandwidth to defend against DDoS, you can also protect against DDoS attacks by purchasing high-quality anti-DDoS products from a network security company. For example, Anti-DDoS Pro CDN will be more flexible in defending against DDoS. DDoS attacks directly resolve domain IP addresses to deliver various packets to domain name IP addresses, resulting in peak broadband traffic and users being unable to access the domain name normally.

After using CDN acceleration, it is equivalent to adding a transfer station between the server and the user, so that the effect of hiding the real IP of the server can be achieved, and when the attacker attacks the server, the attack is the IP of the service provider, and will not pose a threat to our real server. In addition, DDoS attacks will be monitored in real time, and when DDoS attacks are detected, they will be automatically identified and cleaned and given early warnings.

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.

2. Sufficient network bandwidth to ensure that 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.

3. Find a professional network security protection company; Aquanx supports HTTPS and the latest HTTP 2 protocol, HTTPS full-link support, has T-level super protection capabilities, and has the cooperation of top data center providers and multi-operator networks, and is committed to enhancing bandwidth capacity and router diversity, creating an automated solution to provide effective protection against massive DDoS attacks.

DDoS defense solutions.

We can't stop DDoS attacks. However, there are various mitigation and protection techniques that can limit the damage caused by DDoS attacks. There are two broad categories of DDoS mitigation techniques: general purpose and filtering.

By their very nature, DDoS attacks are brute force attacks. This means using an endless amount of data to keep smashing at their target until it reaches the target. The app crashes and becomes useless.

As a result, DDoS protection and mitigation strategies work by reducing the sensitivity of the overall system and employing filtering techniques to separate legitimate requests from potentially harmful ones.

Ruisu Cloud Anti-DDoS server is connected to the Anti-DDoS line, through the intelligent attack detection platform, real-time and accurate identification of various DDoS variant attacks, and then through the Hong Kong traffic cleaning center, the visitor traffic and requests of the attacked site are cleaned and filtered, completely blocking malicious traffic, and at the same time injecting normal legitimate traffic back to the origin server, and finally achieving the purpose of ensuring that the first is always accessible. Its Hong Kong Anti-DDoS server has a DDoS defense capability of more than 300Gbps and even unlimited protection. Support stress testing and defense, invalid money-back guarantee.

The first thing to do is to make sure that all the patches on your computer system are in place. Make sure there are no vulnerabilities.

If you are a server, you need to install a hardware firewall on your server.

A good firewall can resist 10G DDoS attacks.

In a general computer room, 1 GB of DDoS is enough to paralyze.

There is no other good defense against DDoS......

Depending on the technical ability, perhaps in terms of resources and experience, you can deal with these problems and conduct investigations!

1.Hard resistance to bandwidth expansion.

2.Use a hardware firewall.

3.Choose high-performance equipment.

4.Load balancing.

5.CDN traffic scrubbing.

6.Distributed cluster defense.

7.Screen for system vulnerabilities.

8.System resource optimization.

9.Filter unnecessary services and ports.

10.Restrict specific traffic.

If you do not have solid technology, it is recommended to connect to a third-party cloud security service, such as anti-D protection. That's what I've been using and I'm very satisfied.

Ruisu Cloud DDoS protection can protect DDoS and CC in multiple ways

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There are several ways to prevent DDoS attacks.

Keep the system up to date and make sure you have the latest patch files.

Close the ports that are not in use and keep only the ports that can be used.

Use the CDN and the domain name resolves to the CDN, and don't send mail on the server. Emails expose IP addresses.

Using the high-defense shield machine, the defense of the high-defense shield machine can generally reach 50g, 100g, and 200g defense.

These are some of the methods that can be used right now, and there are no other good ways to do it for the time being.

The server IP cannot be hidden, but it can be set up in **, so that hackers can't get in.

Buying CDN can hide the IP, which corresponds to preventing DDoS, but CDN is generally charged by traffic, and if the attack data is too large, ** will be very high.

The best way is to do it with a firewall policy.

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.