In the last article, we have explained the nature of DDoS attacks and their most common types. Today we will provide more information about the ways to stop or mitigate these attacks with a focus on the most significant solutions.
How to protect your server and applications from DDoS attacks?
Ways to prevent DDoS UDP flood attacks
These are the most common and effective attacks. Their sole purpose is to flood the server network and, even with a server firewall, to make it impossible to stop the malicious traffic.
One solution is DDoS protection provided by the hosting provider. Most providers offer it as an optional addon. This way you don’t have to worry about preventing DDoS attacks at all as your hosting provider will take care and mitigate many types of attacks.
We, at VPSBG.EU, offer our customers a cloud DDoS protection for up to 1.8 Tb/s.
Another solution is to use protection from a third party company that specializes in DDoS attack mitigation. Often this service is quite expensive and is mostly used by enterprise websites, financial institutions, etc. Cloudflare, a fast-growing global content delivery company, has become very popular as an alternative DDoS protection service with significantly lower pricing offers.
TCP-SYN attacks and other protocol attacks
It is possible to limit these attacks with a software solution by using a technique with a SYN cookie. Other protocol attacks can also be mitigated by making special system configurations and by setting additional server firewall rules.
Slowloris attack, HTTP and other application DDoS attacks (Layer 7 attacks)
Unlike the protocol attacks, application DDoS attacks aim to overload the web server or application making it inaccessible to the customers. There are a few methods for mitigating these attacks:
Optimization of the server applications and their configuration according to the best practices.
Develop your website or application using the best and the latest tools.
Use a good working cache. It will help your server not to get overloaded also during times of peak traffic.
Upgrade your server resources. Having the best possible optimizations, caching and settings is essential, however, it is also important to have enough RAM and CPU power to meet the higher demand during traffic spikes.
In some cases, these attacks can be stopped using specific server firewall rules.
Attacks using a vulnerability in the software or web application
Usually, software developers quickly fix any vulnerabilities in the code once they discover them, however, system administrators don’t always apply the updates in a timely manner. This can risk a potential data leak or an application crash. Although it is possible to restrict access to the application, most of the time they are public (like websites and public apps). This is why the most effective way of protection is updating all software timely (including libraries, operation system, WordPress, etc.)
We can conclude that the best way to prevent DoS/DDoS attacks is to use DDoS protected VPS and VDS services, to use the best configuration and caching practices, and also to update your system and software.