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ACK flood DDoS attack


This article will guide you on methods to prevent ACK flood #DDoS #attack. An ACK flood DDoS attack occurs when an attacker attempts to overload a server with TCP ACK packets. 

Client requests connection by sending #SYN (synchronize) message to the server. Server acknowledges by sending SYN-ACK (synchronize-acknowledge) message back to the client. Client responds with an #ACK (acknowledge) message, and the connection is established.

When computers communicate via TCP, received packets are acknowledged by sending back a packet with an ACK bit set. 

The TCP protocol allows these acknowledgements to be included with data that is sent in the opposite direction. 

Some protocols send a single acknowledgement per packet of information.

To stop a SYN #DDoS attack:

1. Filtering.

2. Increasing Backlog.

3. TCP half-open: The term half-open alludes to TCP associations whose state is out of synchronization between the two potentially because of an accident on one side.

4. Firewalls and Proxies.

5. Reducing SYN-RECEIVED Timer.

6. SYN Cache.

7. Recycling the Oldest Half-Open TCP.

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HTTP Flood DDOS Attack How to Mitigate the attack


This article will guide you on how to recover from DDoS attacks. Basically, protecting the web server against #DDoS #attacks is important. You can apply these measures to mitigate the error from causing troubles.

DNS #flood is a type of Distributed Denial of Service (DDoS) attack in which the attacker targets one or more Domain Name System (#DNS) servers belonging to a given zone, attempting to hamper resolution of resource records of that zone and its sub-zones.

To prevent DDoS attacks:

1. Buy more bandwidth. 

2. Build redundancy into your infrastructure. 

3. Configure your network hardware against DDoS attacks. 

4. Deploy anti-DDoS hardware and #software #modules. 

5. Deploy a DDoS protection appliance. 

6. Protect your DNS servers.

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