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Do you mean something to prevent a centos server being DDoS attacked? &nbsp;IF so you can start with iptables (the firewall) this has some DDoS protection, such as rate limiting, flood prevention and black / white listing capabilities 
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Do you mean something to prevent a centos server being DDoS attacked?  IF so you can start with iptables (the firewall) this has some DDoS protection, such as rate limiting, flood prevention and black / white listing capabilities

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could you please describe a little more about how to ?
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could you please describe a little more about how to ?

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Assuming you are already using iptables as your firewall, you can add:<br />
iptables -N syn-flood<br />
iptables -A INPUT -p tcp --syn -j syn-flood<br />
iptables &nbsp;-A syn-flood -m limit --limit 1/s --limit-burst 4 -j RETURN<br />
iptables &nbsp;-A syn-flood -j DROP<br />
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or you may want to limit it to specific ports and / or hosts
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Assuming you are already using iptables as your firewall, you can add:
iptables -N syn-flood
iptables -A INPUT -p tcp --syn -j syn-flood
iptables  -A syn-flood -m limit --limit 1/s --limit-burst 4 -j RETURN
iptables  -A syn-flood -j DROP

or you may want to limit it to specific ports and / or hosts

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how could i limit ddos to a specific port or host ?<br />
i am using ip tables yes, but what exactly do this codes
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how could i limit ddos to a specific port or host ?
i am using ip tables yes, but what exactly do this codes

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is there any secure software for this ?
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centos ddos test and protection

A Linux distribution is an operating system made as a software collection based on the Linux kernel and, often, on a package management system and are available for a variety of systems. A typical Linux distribution comprises a Linux kernel, GNU tools and libraries, additional software, documentation, a window system (the most common being the X Window System), a window manager, and a desktop environment. Most Linux systems are open-source software made available both as compiled binaries and in source code form, allowing modifications to the original software. Over three hundred distributions are in active development, including commercially backed distributions (such as Fedora, openSUSE and Ubuntu) and community-driven distributions (such as Debian, Slackware, Gentoo and Arch Linux).

Linux Distributions

Security is the protection of information systems from theft or damage to the hardware, the software, and the information on them, as well as from disruption or misdirection of the services they provide. The main goal of security is protecting assets, and an asset is anything of value and worthy of protection.  Information Security is a discipline of protecting information assets from threats through safeguards to achieve the objectives of confidentiality, integrity, and availability or CIA for short. On the other hand, disclosure, alteration, and disruption (DAD) compromise the security objectives.