Filter traffic landing page

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Popular Traffic Filtering Methods

In this article, we will look at popular traffic filtering methods designed to protect against DDoS attacks, and explain which approaches help ensure the stability and security of network infrastructure.

IP Address Blocking

An IP address (Internet Protocol address) is a unique numerical identifier assigned to each device in a computer network. An IP address provides connection and allows devices to communicate with each other. To make it more readable, an IP address is written in decimal or binary form, separated by dots. For example, 216.58.214.206.

Protection against DDoS attacks by IP address blocking is one of the most common ways to combat malicious traffic. It is based on identifying attacking IP addresses and blocking them to prevent access to the target. When anomalous traffic is detected, the protection system analyzes and compares the senders' IP addresses with a pre-created IP black list. If an untrusted address is on this list, the traffic coming from it will be blocked.

Blocking by IP address does not guarantee a full protection. For example, attackers can change their IP, thus bypassing the blocking, and continue the attack on the victim resource.

Another significant disadvantage of this method is the vulnerability to IP spoofing when using certain protocols, for example, UDP. In this case, if the source IP address is fake, blocking it does not help: UDP packets will continue to arrive with new IP addresses in the headers.

Blocking one infected IP address can affect hundreds or thousands of legitimate users. In the modern Internet, the IPv4 protocol is used to transmit information. Due to the limitations of this technology, many users are hidden behind one IP. Most Internet service providers use this technology. This may bring about situations when, for instance, a mobile Internet user is located in Paris, but the IPv4 protocol technology will make it appear as if he is accessing the Internet from Lyon. When the IP blocking method is used, all users who received the same IP address when connecting to the network will be blocked because of one infected attacking device.