Things are explained very simply here but it WILL give you a good understanding what iptables is and how to begin writing a script. http://www.tweako.com/iptables_explained_part_1_a_tutorial_to_understa...
If you know linux you should have basic knowledge of the command line. If you dont this tutorial will help you out. http://forum.nystic.com/viewtopic.php?f=19&t=566
A rootkit is a program designed to take fundamental control of a computer system, without authorization by the systems owners and legitimate managers http://www.cyberciti.biz/faq/howto-check-linux-rootkist-with-detectors...
This howto is for configuring a PPPoE server on FreeBSD, if you need to give Point to Point over Ethernet connection to your clients. http://www.freebsdonline.com/content/view/29/45/
This tutorial is about configuring a router on FreeBSD operating system using IPFIREWALL (ipfw). http://www.freebsdonline.com/index.php?option=com_content&task=view&id...
reating different networks for each meeting room is pretty much out of the question. http://www.tweako.com/building_a_cheap_secure_wireless_wlan_infrastruc...
TeachMeIT offers excellent opportunity for learners to prepare for network + certification exam. http://www.teachmeit.com/tmit/cobrand/networkingcourses.asp
This tutorial shows how to combine Samba and GRUB to build a compact, highly adaptable, cross-platform test network http://www.ibm.com/developerworks/edu/l-dw-linux-ltn-i.html?S_TACT=105...
This introductory-level tutorial shows how to begin programming with sockets. http://www.ibm.com/developerworks/edu/l-dw-linux-sock-i.html?S_TACT=10...
This tutorial covers different mechanisms for capturing and manipulating packets. http://www.ibm.com/developerworks/edu/l-dw-linux-packet-i.html?S_TACT=...