iptabels
 

iam new to rhel5 i want know about purpose of and types in detail

Iptables is Linux Firewall. you need to learn about Iptables. isn't it? well, refer iptables manpage or
http://www.netfilter.org/documentati...entation-howto

I'm afraid you would need to expand a lot on your query here, there's not enough to work out what you actually mean. You might want to do some background reading on iptables?? https://help.ubuntu.com/community/IptablesHowTo

Is it too dificult to type IPTABLES and press enter in google ?

Always, search your query in google and linuxquestions.org before creating a new thread.
You could use the following method to limit your google search to linuxquestions.org

IPTABLES site:linuxquestions.org

Hi Vikas, He/She new to this forum and new to Linux too so please treat him/her pleasantly

Let this type on your terminal:

Whilst I certainly agree with your sentiments I do find it interesting how "New to Linux" seems to also cover "New to internet forums", as if the new subject matter eliminates the need to understand how to use the internet

Indeed ... anyway, here's the RHEL manual HOWTO http://www.linuxtopia.org/online_boo...ion/index.html. See 42.8, 42.9