I’ve found the IBM Redbooks page, in which, there’s many interesting books like this

TCP/IP Tutorial and Technical Overview

In this one, you can find info about the different network layers, from physic to application, with  explanations about routing protocols (OSPF, EIGRP, BGP…), IPv6, LDAP, VoIP, Wifi stuff, etc

Linux performance and tuning guidelines

In this, you’ll finde some very useful info. about how Linux works managing filesystems, I/O, memory, etc and how we can monitoring this with some well-know tools like Wireshark, vmstat, top, strace and many other commands.

Also in the IBM Redbooks page, there’re thousands of books about different topics, like WebSphere, DB2, AIX, Tivoli, Linux server integration and many other IBM stuff for their servers.

PD: I’ll add others redbooks . Send me suggestions about other books

Sometimes i’ve had some files which had a rare extension. Don’t worry, you can use FILExt. This page contains a great database with all the extension you can imagine. Just type the extension you need, and will return the software you need to run that file

click ove the image to go FILExt

I discovered this webpage, and have some networking stuff, from basic things to advanced. There’re some information about networking protocols, software and some things of Cisco Systems.

In conclusion, one of the greatest networking webpages i’ve ever seen

(click over the logo to access)

I founded this webpage yesterday, have some videos about tricks of networking, OS, etc

http://www.irongeek.com/i.php?page=security/hackingillustrated