Peter, If you want to learn about TCP/IP, especially in regards to UNIX, the best book on the market is: TCP/IP Illustrated, Volume 1 by W. Richard Stevens You might even be able to get it in Slovakian as it is widely translated. This book thoroughly dissects TCP/IP.
An excellent general book on Firewalls is: Building Internet Firewalls, 2nd Edition by Elizabeth D. Zwicky, Simon Cooper, and D. Brent Chapman After you've read this, another good book is: Network Intrusion Detection, 3rd Edition by Stephen Northcutt and Judy Novak This is a good book to learn about security internals as you have to really understand how things work to effectively implement a Network Intrusion Detection system. Of course, if Daniel decides to write a book, I would recommend that... Otherwise, the OpenBSD Networking FAQ is also a good place to look: http://www.openbsd.org/faq/faq6.html <> Jim -----Original Message----- May I ask you something before I ask you something? If I want to learn more about TCP/IP and that kind of stuff to better understand firewalling, are there any (there are many I know, but that's the problem (: ) 'good' tutorials or FAQs or documentation on 'the net' I should study before I send some questions here? You know what I mean. :) About flags, attacks, sniffers, port scans and so on. I spend 70% of my time allocated to learn more about this only by searching for some good documentation. So would you be please so kind and direct me to some links where I can find 'the knowldege'? :o) Thank you very much. Peter Hunčár ŠCCh FChPT STU