Preventing dos denial of service ddos attacks

There a various ways to protect your server from getting a Denial of Service attack, but for mitigating these kind of attack you should always keep your

• -- Softwares up to date
• -- Close any unused ports
• -- Implement security modules for your servers which are optional
• -- Keep redundant server, so that if one server goes down, still the other server can take the load
• -- Perform security audits, and check your log files for any attempt of flooding your server with request.
• -- Install security component mod_dosevasive if you are using apache.

There are major Security companies coming up with unique filter, which filters the request and blocks unwanted request and the IP of the originating address from where the request is coming. Denial of Service attacks can be prevented by the  use of a combination of attack detection, traffic classification and response tools, which can block traffic from an attaker and allow traffic from a genuine user. Firewalls prevents DOS by allowing or denying protocols, ports or IP addresses.Switches also provide some rate limiting and ACL features.

Some switches have automatic  traffic shaping, delayed binding , deep packet inspection and Bogon filtering to detect and prevent denial of service attacks through automatic rate filtering and WAN Link failover and balancing.