What is a DDOS attack on a site. How to protect yourself?
In the case of DDOS attacks, server performance decreases or the system crashes. Attackers use bots, their number can reach a million, to fill unnecessary data storage. They can be managed remotely and are usually collected from all over the world.
As a result, the system cannot withstand the load. Servers are overflowing with data and there is not enough space for real users. Failures occur and they can simply shut down. Attackers try to make Internet service protocols inaccessible as a result of DDOS attacks by overloading them.
Attacks can be divided by the levels at which they are targeted. In most cases these are the following levels of protocols:
The main signs of DDOS attacks:
- The resource is not connected to the network, or responds slowly to requests;
- You can fix increased activity in the results of analytics, or in requests;
- There are suspicious requests in the logs of the source web server, which is not consistent with normal user behavior.
How do DDOS attacks occur depending on levels?
Two types of attacks occur most often.
Network and transport protocols are overloaded at this level. In this case vectors – synchronized streams (SYN) and other “mirror” attacks – custom bundles of datagram packets (UDP) are used. This type is mostly voluminous and time-consuming. It is the most common and easy to detect.
In this case presentation and application protocols overloads occur. They are not as frequent as the previous ones, but they are more complicated and difficult to defend. DDOS attacks of this type are often small in scale, but they target high-value application elements. As a result of overloads, real users lose access to applications.
What is the purpose of DDOS attacks?
The results of attacks can be very disastrous for the business as a whole and for individual business processes. Work, interaction between employees, the company and customers is disrupted. The resource may be unavailable, so customers cannot order goods or services or contact managers.
When this lasts for a long time, material and reputational losses are inevitable. Customers turn to competitors, the number of dissatisfactions and complaints grows. Attacks have a negative impact on companies which provide hosting. Servers are unavailable, work either slows down or stops, which customers are not happy about either.
How to defend against DDOS attacks?
It is possible to remove traffic if it is suspiciously high according to the estimates of the backbone networks. You can set a filter that will filter out users who are connected to the resource. It determines who is allowed to connect, while others are rejected. The second way is a virtual machine, it filters out malicious connections.
When an attack is detected in an organization you should immediately contact the provider. This will allow the necessary measures to be taken as quickly as possible and reduce the number of losses. Specialists monitor connections during an attack and they can last for weeks.
No one can be immune to DDOS attacks, so you should take all precautions and contact a reliable specialist.
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