Summary of effective ways to combat DDoS for VPS in 2021

DDoS attacks cause a lot of unpredictable consequences that cause your website to crash, affect bandwidth capacity and can even lead to loss of website control. Protecting your VPS and hosting against DDoS attacks is essential. Therefore, in this article, Tino Group will synthesize anti-DDoS methods for VPS to help you best prevent DDoS attacks!

Learn about DDoS
What is DDoS?
DDoS is an acronym for Distributed Denial of Service . This is one of the methods of DoS - Denial of Service attack or denial of service attack, but has a higher level of danger and is more difficult to prevent.

Usually, hackers will make your website "flooded" with continuous requests to the server, causing your server to be overloaded, disconnected and they will take advantage of the vulnerability to take control of your website. Friend.

If you encounter this attack situation, you will be in a lot of trouble. In particular, for businesses that do DDoS attacks that will perform extortion or data theft, these acts will seriously threaten the business of businesses.

DDoS attack methods
While software and security services are increasingly improved, hackers continue to develop different attack methods that affect VPS service providers and users such as:

Advanced Persistent DoS (APDoS)
HTTP Flood
SYN Flood
Fraggle Attack
UDP Flood
Ping of Death
Application Level Attack
Zero-day DDoS Attack
Slowloris
NTP Amplification
…
In particular, Application Level Attack, Advanced Persistent DoS and Zero-day DDoS Attack are the methods of DDoS attacks that cause great damage and are difficult to prevent!

Application Level Attack
Application Level Attacks have an attack method based on exploiting unpatched vulnerabilities in applications. Usually, hackers will take advantage and exploit discovered vulnerabilities in applications, not attack the entire system or the entire server.

This type of attack is considered one of the types of attacks with a high level of sophistication, causing many serious consequences.

Advanced Persistent DoS
Advanced Persistent DoS is one of the most difficult attack methods to prevent. This attack method combines many other attack methods at the same time to overload the target's system and cause denial of service.

Zero-day DDoS Attacks
Zero-day DDoS Attacks is a generic name given to the recently emerged DDoS attack methods. Most of these attack methods will exploit vulnerabilities on the system and attack the server.

How to prevent DDoS for VPS effectively
3 ways to fight DDoS for regular VPS
Regularly back up data
You shouldn't wait for the "water to the feet to jump", especially during security-related activities.

Therefore, the best way to prevent is to back up, back up all data on your VPS before any DDoS attack, malware infection , virus happens on your hosting , website.

Depending on the hosting provider, they will provide you with a free backup service or not. You can contact your service provider to learn more about backing up data.

Set password with high difficulty
Ideally, you should set a password for each service and software in VPS independent of each other, avoid using the same password for the entire service just because you often forget. You can store your passwords on paper or some other file but when saving you should not name the file "whole service password", the reason you must have come up with it, right?

To set a password with high difficulty, try these suggestions:

Set a password longer than 8 characters
Do not use personal information, email address, phone number to book.
The password should contain letters, numbers and special characters.
Proactive prevention
Of course, the best way to prevent it is to be proactive in preventing infections, malware viruses or DDoS attacks.

You proactively find, scan and check if your VPS is okay or not; You should also back up your data regularly to avoid losing all data.

4 ways to spend money to fight DDoS for VPS effectively
Use Firewall – dedicated firewall
Using Firewall – a dedicated firewall is one of the effective ways for you to combat DDoS for VPS. Firewalls will help you prevent unauthorized access, threats from many sides, and firewall service providers will do it for you.

However, the cost of firewall services is not cheap.

Increase server bandwidth and storage capacity
If the DDoS attack targets your VPS with 100,000 requests. However, your VPS can withstand 1,000,000 requests at the same time, that DDoS attack will not affect your VPS much.

In addition, broadband and large storage capacity will also help users to access your website more stable.

Using CDN
CDN – content delivery network – will make it possible for you to distribute your data across multiple servers at the same time. Therefore, when a hacker targets a service provider's server, you will have other servers to "scrap" and recover data.

Using Anti-DDoS . services
The last and the most direct method to target DDoS attacks are Anti-DDoS services.

Currently, there are many Anti-DDoS service providers to combat DDoS attacks. So, if you think VPS, your website is likely to be attacked by DDoS, buying an "insurance" package to protect your VPS and website is also a necessity!

Here, Tino Group has compiled for you a lot of ways to prevent DDoS for your VPS safely and effectively. Hopefully, this general article can help you prevent malicious DDoS attacks. Wish your VPS will never encounter DDoS attacks!

Frequently asked questions about anti-DDoS for VPS
Does DDoS affect website data?
Yes, there are many cases where hackers actively attack some service providers or some websites to demand ransom, steal information and sometimes take complete control of the website. Therefore, when being attacked by DDoS, you will most likely face data loss.

What are the signs of VPS being attacked by DDoS?
When infected with viruses, malware, you will hardly know with normal operations. However, with DDoS you will see:

Your website loads extremely slow despite the internet, your computer is fine
Unable to access some websites in VPS
Packet bandwidth drops suddenly
A huge amount of traffic pours into your website at the same time
How to configure IPTables for Linux?
To configure IPTables – a completely free firewall service for Linux, you will need to have:

1 VPS using Linux operating system or versions deployed from Linux
Refer to the article What is IPTables? Detailed instructions for configuring IPTables to do it!
Which CDN service should I use?
If you are intending to invest in a CDN service, you should consult the world's largest CDN service provider, Cloudflare .