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Cisco 350 Series And Kismet

Cisco 350 Series And Kismet

This tutorial is describing how to configure a Cisco Aironet wireless card and how to set up kismet in order to run with it.

Step-By-Step Configuration of NAT with iptables

Step-By-Step Configuration of NAT with iptables

This tutorial shows how to set up network-address-translation (NAT) on a Linux system with iptables rules so that the system can act as a gateway and provide internet access to multiple hosts on a local network using a single public IP address. This is achieved by rewriting the source and/or destination addresses of IP packets as they pass through the NAT system.

How do I start the X server in Suse 9.2 when the graphic card is working work in text mode?

To start the X server from a text mode session, execute the command:

startx

How do I find out if a remote system is still alive, if certain services are running, which processes are running, etc.?

You can use ping to see if the system is alive:

ping -c4 <system's IP address>

To see if a certain service is still alive, use the telnet command:

telnet <system's IP address> 25 (for SMTP)

telnet <system's IP address> 80 (for HTTP)

telnet <system's IP address> 110 (for POP3)

You can login to the system using SSH (port 22) (use PuTTY if you are on a Windows PC; PuTTY is an SSH client for Windows), and when you are on the system, you have a few useful tools to gather more information:

How do I scan my Linux system for rootkits, worms, trojans, etc.?

Either with chkrootkit or with rkhunter.

chkrootkit

Either install the package that comes with your distribution (on Debian you would run

apt-get install chkrootkit

), or download the sources from www.chkrootkit.org and install manually:

wget --passive-ftp ftp://ftp.pangeia.com.br/pub/seg/pac/chkrootkit.tar.gz
tar xvfz chkrootkit.tar.gz
cd chkrootkit-<version>/
make sense

Afterwards, you can move the chkrootkit directory somewhere else, e.g. /usr/local/chkrootkit:

How can I get a list of quotas assigned to my users and groups and of the space used by them?

repquota -avug

shows a list for both users and groups.

repquota -au

shows a list for users,

repquota -ag

a list for groups.

How can I set a limit as to how much space is available for a web site I put on my server? Like it is limited to 50 MB of space.

First, you have to enable quota on your system. Have a look at the quota section of the appropriate "Perfect Setup" tutorial for your distribution on HowtoForge.

After you've enabled quota on your system:

To set quotas for a user or group, use the setquota command (see

man setquota

for more information), e.g.:

setquota -g $group $blocks $blocks 0 0 -a
setquota -u $username $blocks $blocks 0 0 -a

Replace $group, $username and $blocks. Note: $blocks is the quota size in MB * 1024! To deactivate quotas for a user or group, run these commands and set $blocks to 0.

Quota does not work under SuSE 8.2!

On a standard SuSE 8.2 installation the quota module is not loaded into the kernel which is why

quotaon -avug

gives back an error.

Load the quota module manually with

insmod quota_v1

and

insmod quota_v2

To have those modules loaded on every bootup of the system please insert

modprobe quota_v1

and

modprobe quota_v2

in /etc/init.d/boot.local.

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