A firewall, firewall or firewall is

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a program that filters incoming and outgoing traffic. It can be installed on a server or router to filter out suspicious requests before they get inside the system. This is an effective method of protecting yourself from DDoS attacks, but it requires constant monitoring and fine-tuning in the firewall itself. Such software blocks illegitimate traffic automatically, based on the parameters set by the administrator, so if the conditions are set incorrectly, ordinary users may be blocked.

Nginx modules
Nginx, a popular web and proxy server, is often used as a software pakistan whatsapp number database protection tool. It has modules (specifically limit_conn and limit_req) that allow you to set restrictions at the application level. Using the first one, you can specify the maximum number of simultaneous connections to the server, and using the second one, you can create a limit on connections from one IP address for a specific period of time. If the number of requests exceeds these values, then in the first case, new packets stop being accepted, and in the second case, the IP address is temporarily blocked. Of course, this requires understanding the code. In this way, you can protect your server from DDoS attacks directly in the ispmanager control panel.

Software filter
Web applications can also be used as a protective measure. We are talking about software filters that use the JavaScript language, which is inaccessible to bots. Scripts are used to create a kind of stub - a page that delays and does not allow a DDoS attack on the server. The operation of such a filter is extremely simple and is configured in the configuration. You prescribe the conditions that a visitor must meet so that the system blocks him (or rather, redirects him to a stub page instead of the requested one).

Cloud services
Protecting a server on your own is a thankless task. There are ready-made solutions for detecting and repelling DDoS attacks on the market, so you should not neglect the help of professionals. Use content delivery networks (CDN) like Cloudflare to distribute the load across its servers. Turn to special cloud services (AWS Shield, Azure DDoS Attack Protection, Cloud Armor, IBM Cloud Internet Services, etc.), which provide a high level of security at different levels. They provide comprehensive protection, filter traffic, detect and block suspicious requests, and repel attacks.

Tools for protecting your server from DDoS attacks.Image by vectorjuice on Freepik.
Conclusion
DDoS attacks are a serious threat to the stability of information and computing systems of any scale. They come in different types, it is impossible to protect a server from them completely, but it is necessary to make life as difficult for hackers as possible. System downtime leads to financial and reputational losses, so DDoS protection is a critical step for businesses. Various tools can be used at the server level or with the help of cloud services, however, each method has its own strengths and weaknesses - choose the most suitable for you.