Shulou(Shulou.com)06/03 Report--

Compared with other CDN service providers, the main advantages of CDN include stability and speed, high cost performance, ease of use, high efficiency and intelligence. More users will ask about the advantages of stability and speed. Generally speaking, CDN is characterized by sharing the pressure of the source station, avoiding network congestion, ensuring the acceleration of the distribution of website content in different regions and different scenarios, and improving the access speed of resources. The following is an introduction to the CDN acceleration service and how it prevents DDOS attacks.

How to prevent DDoS with CDN? The cdn node can form a large traffic load cluster, so it can handle much more bursty traffic than the origin server of the website itself. In addition, choose a good cdn service provider, who usually has experienced technicians and processes, and is more prepared for mitigation of DDoS attacks.

The dynamic acceleration mechanism and intelligent sinking mechanism established by cdn in relevant nodes can help distribute website traffic to each node and intelligently distribute traffic. If attacked by ddos, cdn can disperse the attacked traffic, saving the pressure on the site server and node. At the same time, it enhances the difficulty of website attacks by hackers and helps managers provide more time. Introduce two ways to protect the origin site behind the CDN.

IP rate limiting

One way to protect the origin server is to do IP rate limiting: only X requests are allowed from an IP address in a given time period. These restrictions do not apply to CDNs because a CDN makes many valid requests from a small number of IP addresses, and users are willing to let all of these requests pass through.

whitelist

Another way is to allow requests only from your cdn whitelist. But in practice it is difficult to achieve results. You can add whitelisted IP addresses or some unique identifier in the request header. Delivery origin hosting is a simple trick and the best solution. Create some random, long alphanumeric character set as a subdomain. Simply add the host name to the HOST header of the request whitelist and you're done.

The above is an explanation of how to prevent ddos with cdn. cdn technology can effectively prevent ddos attacks and reduce the harm caused to websites.

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