Techniques for Preventing DDoS attacks

The Denial of Service attack, i.e. DDoS where the hacker uses several infected systems to target a computer networking system. Monitoring such attacks is challenging as the incoming traffic of any website comes from several sources, hence distinguishing the legitimate traffic source and the illegitimate ones become difficult. A professional who is aware of the right tools, can prevent these attacks.

 

Who are the victims of these attacks?

 

Earlier, only some of the big websites were affected by these attacks. However, today, the smaller websites are exposed to the risk of these attacks as much as the bigger websites. The motive for these attacks could be anything such as strategic, political or simply for fun. However, one should understand that no one is safe and acknowledging that even your business can get affected by these attacks.

Techniques such as intrusions, firewalls, etc. were used previously to restrain these DDoS attacks. However, there are several new techniques that have replaced the new ones. Some of the DDoS Protected Server techniques are:

Aggressive Aging: Botnet attacks where a virtual individual carried out tasks in IRC camouflaged just like a real user, didn’t need anything except opening valid accounts. These connections blocked the central data structure. With aggressive aging, one will be able to prevent attacks from connection tables.

Connection Limiting: This is one of the most effective tools that can help in preventing attacks. If the server receives too many connection requests, it can go down. With this approach, the number of new connections within a short period of time could be limited. This helps the server to have relief by preventing overcrowding. In this connection, preference is given to existing ones and the new ones are put on hold.

Dark Address Scan Prevention: Dark IP addresses are those which are not assigned by the Internet Assigned Number Authority (IANA). Inflow and outflow of packets from these dark addresses are identified by Dark Address Scan Prevention and thus this prevents the DDoS attacks.

Stealth Attack Filtering: Filtering the source of attacks is essential to get rid of these attacks. Scans are used to identify the roots of these attacks. With network scans, IP addresses of the source of the scans are revealed. By identifying the attacks and the attackers, these attacks can be prevented to a certain extent.

SYN Proxy: In these types of attacks, the computers replicate the genuine IP addresses and throw the SYN packets. Once these packets are received by the server, it adds them to its central data structure. The network goes down, when the server can’t respond to the false commands and thus prevents the attack. Several intermediate appliances make use of SYN proxy by replicating responses of the server. The connection request is screened and only legitimate responses go ahead.

Taking help of security companies: These are several firms that help in mitigating DDoS attacks. One of the most common tools used by them is traffic filters. Any traffic with threat is directed to the security companies, where the legitimacy and harmful traffic is differentiated and the legitimate one is sent back to the website. By availing such services you can prevent attacks from happening.