Hi,
I require a free firewall solution for Centos for a client of mine.I dont know any good ones and wanted to ask that would the DDoS protection and ssl certification enough for his private project which operates over UDP and a web server.

if you have a server with Centos installed then all you need is CSF https://www.configserver.com/

CSF is pretty good. It has quite a few different profiles already which you can use based on your requirements.

We use CSF on all of our servers so would also recommend this.

Another vote for CSF

CentOS, and every other *ix based server already has a firewall built in, iptables .
CSF , as mentioned is a great frontend for iptables, but it's not a firewall in and of itself.

CSF again (and some in the house "sentinels"). But if you talk about DDos protection that is another story....

I have to agree that CSF is a pretty good front-end for IPTables. Beyond that LFD which comes with CSF is very nice.

Agreed, however DDoS attacks can come in many unpleasant flavors.

CSF can only handle minor DDOS protection due to the limitation on your bandwidth pipe You will need to subscribe to third party DDOS protection to overcome this.

The fact that CSF only handles minor protection has more to do with server resources than the actual bandwidth , though bandwidth has a slight bit to do with it.

The server itself can only handle so many requests and processes before overloading. Continually flooding the server with requests is going to do precisely what CSF is there to prevent, overload it.

In the end, yes, either a 3rd party DDOS protection service, or that of your provider is going to be needed for a true DDOS.

CSF is the best free firewall option for you which will ease your working with firewall rules.

I recommend CSF as well as a best software firewall option
You can also enable csf build in Gui or install Webmin to access the GUI.

CSF! its the best available solution.

My vote for ClearOS.