Reserved Network Numbers

Reserved network numbers are part of address space that is considered private and are commonly used on internal networks.

Class A
Netmask 255.0.0.0
Address 10.0.0.0-10.255.255.255

Class B
Netmask 255.255.0.0
Address 172.16.0.0-172.31.255.255

Class C
Netmask 255.255.255.0
Address 192.168.0.0-192.168.255.255

VI cheat sheet

If you're new to VI, here is a short cheat sheet that should get you started.

ESC - Control mode
h - move left
l - move right
j - move down
k - move up
W - move to the beginning of the next word
B - move to the beginning of the preceeding word
e - move to the end of the current word
0 - move to the beginning of the line (zero)
$ - move to the end of the line

:q - quit
:w - save
:q! - quit without saving

x - deletes character
D - deletes to end of line
dd - deletes entire line

i - insert text before current character
a - insert text after current character
I - insert text at begging of the line
A - insert text at the end of the line
s - replace existing character

Wireshark Intro

This is a decent introduction type video to Wireshark. Wireshark, for those that do not know, is a protocol analyzer and a very powerful tool to have in your network troubleshooting arsenal.

Wireshark

Search Security Video

Raid Levels

This is a pretty good website if you want to learn about the different raid levels and how they work.

ACNC

IM, let's not leave out the Windows and Linux users

As I said before, I prefer to have one IM client for all my instant messaging needs. Pidgin is the one I prefer when working on a Windows or Linux box.

Pidgin

Solaris – Working with files and directories

Here are a few commands that are handy when working with files and directories

“pwd” – This command shows you the directory you are currently in

“ls” – This command shows you the contents of the current directory
“ls –a” – displays hidden files
“ls –l” – displays a long listing of the contents in the directory
“ls –ld” – view detailed information about the directory without it’s contents
“ls –R” – displays a recursive list of the contents of the directory
“ls –F” – displays the file types in the directory

“file” – to view the file type of a specific file “file filename”

“cd” – This command allows you to changed directories
“cd ..” – changes you from the current directory to the parent directory
“cd /directory/directory” – changes to a directory using the absolute path
“cd ../..” – changes you up two directory levels

“cat” – displays the contents of a file “cat filename”

“more” – allows you to page through the contents of a large file

“head” – this command is used to display the first 10 lines of a file
“head -6 filename” – displays the first six lines of a file

“tail” – displays the last 10 lines of a file
“tail -6 filename” – displays the last six lines of a file

“wc” – displays the number of lines, words, and characters in a file







Solaris – Working with files and directories by
Shannon Bowen is licensed under a
Creative Commons Attribution-Share Alike 3.0 United States License.

Based on a work at
techgrabbag.blogspot.com.

IM for your Mac

I like an IM client that will connect to many different services instead of running multiple clients. The one I found for the Mac that works well is Adium. Give it a shot and see what you think.

Adium

Anti-virus

I have used many different anti-virus programs, both free and not so free. Avast gives you a nice mix of protection and performance and for personal use it is free.

Avast