centos ddos test and protection

is there any secure software for this ?
Who is Participating?

[Product update] Infrastructure Analysis Tool is now available with Business Accounts.Learn More

I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

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
CahitEyAuthor Commented:
could you please describe a little more about how to ?
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
CahitEyAuthor Commented:
how could i limit ddos to a specific port or host ?
i am using ip tables yes, but what exactly do this codes
for a specific port add --dport 80
for port 80

The code above creates a chain called syn-flood (iptables -N syn-flood), then adds input packets type tcp any port that are syn type packets ( iptables -A INPUT -p tcp --syn -j syn-flood) then adds 1 syn per second in bursts of 4 (iptables  -A syn-flood -m limit --limit 1/s --limit-burst 4 -j RETURN) then drops them  (iptables  -A syn-flood -j DROP)
this is a very simple example
there is an excellent example here:

and here's a bit more on dropping other type of packet as well as plain syns


Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Linux Distributions

From novice to tech pro — start learning today.