On 2013-12-02, Robert Clove cloverobert@gmail.com wrote:

I was searching around but was not able to find out. We all know that packet traverses through the Net Filter hooks but how to practically realize that.

It's not really clear what you are asking. Are you just looking for general documentation?

http://netfilter.org/

CentOS-specific docs?

https://access.redhat.com/site/documentation//en-US/Red_Hat_Enterprise_Linux...

Something more specific? If so, please give real details so people can give you real help.

--keith