Sunil: glad you found it useful.
You will notice that security detail, on more proprietary systems, is normally hidden behind, so called, sensitivity settings. Personally I don't trust any security program with only three options (low, medium, high). Usually, low=insecure and high = unuseable. So everyone uses medium - and nobody knows what any of the settings actually do
One complaint I have seen though is that linux appears to lack a gui firewall with the behavior of things like zonealarm
. This is a simple gui which switches everything off by default, yet reports any attempt at access in either direction that isn't allowed. If it is outgoing, it asks if you want this access (it may be a browser) and so it is very easy to restrict (say) internet access to (say) firefox and exclude all other browsers etc.
It is commonly used as a windows diagnostic tool, since malware trying to phone home will be stopped and
it's existence reported.
With linux, we don't need third party tools to check running processes.