Hi, thanks for replies from all!
So what happens to services whose access is not controlled by tcpwrappers. Yes, that's the problem certainly. SHould be checked carefully.
Say somehow you have mysqld runnign in the background. Anyone from the net would be able to access your system via mysql and if there was a vulnerability in it they could exploit it same would go for a service like Yes, I do have that running, but well, inside mysql there is also access control where I deny access from all others except of me by default.
But an ipchains firewall with default to deny could be configured to only allow in those connections you need and by default block all other connections. Well, I understood the same thing from the other posts.
I should go for it. Thanks again. Marko