Posts tagged use
Lock Down IP Addresses – SSH and Else
Jan 26th
If you know the IP addresses that will be connecting to your machine, lock them down. Use the hosts.allow file as follows.
sshd : localhost : allow
sshd : 192.168.3. : allow
sshd : 192.168.1. : allow
sshd : ALL : deny
Using sshd : ALL : deny and listing various allow rules blocks everything other than the allowed rules. Therefore using sshd : IP : allow you will be able to connect to the machine from that IP only and everything else will be rejected. This procedure will substantially increase the security of the server.
Using vi, or nano – Terminal Text Editors
Dec 6th
Vi was the original terminal based text editor created for Unix. It is as small and as simple as it gets. The binary resides within the Unix and Linux bins, and can easily be placed on a removable media for ultimate emergency portability. There are three modes to vi:
1. command mode
2. ex mode
3. insert mode
First open a file. Open your grub configuration file. Sudo vi “/boot/grub/menu.lst”. Use up, down, left, and right to navigate eh terminal. Press escape and it will return the mode you are in. Press R to enter replacement mode. Use i or a to insert text rather than replace it. To exit vi use :wq or ZZ. To save without exiting use :w. Or to quit without saving use :q.
Or you can use nano. Type:
sudo nano /boot/grub/menu.lst
Nano is always in edit mode. Move the cursor to the position you want to edit, and backspace to remove text, or type to add. Then press control-o to save, and control-x to quit. After looking into vi, its easy to realize both have the same functionality, and ultimately have various commands to do things. The commands are quirky, especially for us who grew up with graphical editors. But once you know the commands to save and exit you can corrolate functionality with any graphical text editor.
Sendmail Blackhole List – Eliminate Most Spam
Mar 13th
To configure sendmail to automatically bounce most spam use one of the countless blackhole lists that are readily available, and consistently maintained: http://www.declude.com/Articles.asp?ID=97 An excellent blackhole list is maintained by njabl.org. Use is relatively straight forward. Add the following line to the end of your sendmail.mc file, then recompile the sendmail configuration file.
FEATURE(dnsbl,`combined.njabl.org',`Message from $&{client_addr} rejected - see http://njabl.org/lookup?$&{client_addr}')
For more detailed information on how to use this blackhole list you can visit their website directly: http://njabl.org/use.html I used to get well over 150 spam messages per day. Now I maybe get 5 total 
Debian Ubuntu Trash Icon on Desktop
Nov 5th
To add a trash icon to your desktop use the gconf-editor application.
Type in a terminal:
gconf-editor
Navigate to apps->nautilus->desktop.
Checkmark “trash_icon_visible” to set the appropriate option. Simple enough
