Some useful networking resources. http://www.routeralley.com/ra/docs/tcp_udp.pdf TCP and UDP reference. http://www.razorpoint.com/PDF/Rz.PortsList.pdf TCP/IP Ports listing. This is very useful for reference. http://www.gasmi.net/tcp.php Another TCP ports listing in HTML. http://www.hardwaresecrets.com/article/431 An introduction to the OSI model and how the TCP/IP  Protocol works. http://www.protocols.com/pbook/tcpip1.htm A definition of common TCP/IP names. Intro to TCP/IP. TCP/IP and subnet masking explained. Kali …

This command used with grep will return information about your computers memory. [email protected] ~ $ cat /proc/meminfo | grep Total MemTotal: 12221404 kB SwapTotal: 6216700 kB VmallocTotal: 34359738367 kB CmaTotal: 0 kB HugePages_Total: 0 If you want to list all of the hard disk partitions on your Linux system then this command is for you. …

The sysctl command on Linux may be used to return information about your installed hardware; as well as virtual memory information. Below is an example looking at virtual memory information. zsh 7 % sysctl -a | grep vm sysctl: permission denied on key ‘kernel.cad_pid’ sysctl: permission denied on key ‘kernel.usermodehelper.bset’ sysctl: permission denied on key …

Listing the free space on your Linux system. Using the df command to list this on the command-line. The df command for Linux will display a listing of your partitions and how much space is available. The -H parameter shows the outputs in human readable formats. [email protected]:~/Documents$ df -Hla Filesystem Size Used Avail Use% Mounted …

View information about your user on a Linux system The groups command displays the list of groups that your user is a member of. [[email protected]]:~> groups neo cdrom floppy audio dip video plugdev bluetooth scanner netdev[[email protected]]:~> groups neo cdrom floppy audio dip video plugdev bluetooth scanner netdev Using the id command will display a more …

These are the cookies stored on my machine that Facebook has stored on my computer without me knowing. This happens because a website has put the Facebook Like button on their page, then Facebook can track you and see what browsing you are doing after you leave your Facebook session. There is a good article …

Linux is not Windows. http://linux.oneandoneis2.org/LNW.htm This is a very good web page that explains the fundamental differences between Windows and Linux. There are many fundamental changes you need to make when making the switch from Windows to a Linux machine, the major changes difference is that Linux is not as susceptible to viruses as Windows …