The Linux kernel is flexible, and you can even modify the way it works on the fly by dynamically changing some of its parameters using sysctl command. Sysctl provides an interface that allows you to examine and change several hundred kernel parameters in Linux or BSD. Changes take effect immediately, and there’s even a way to make them persist after a reboot.sysctl is used to modify kernel parameters at runtime. The parameters available are those listed under /proc/sys/. Procfs is required for sysctl support in Linux. You can use sysctl to both read and write sysctl data.Many of the tunable performance items can be configured directly by the kernel. The command sysctl is used to view current kernel settings and adjust them.
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Ubuntu: Ubuntu Geek - Ubuntu Tutorials,Howto's,Tips and Tricks
You need to install open-iscsi package for high performance, transport independent iSCSI implementation under Debian Linux. You need Debian Linux with kernel version 2.6.16, or later.
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Debian: Debian Admin Step By Step Tutorials and articles with screenshots
while i’m using my dell d620 with an intel wireless 3945 card i have the following problems with hardy and the new iwl3945:
-throughput is limited 110kb/s rx
-the wireless lan is very unstable
-sometimes the system freezes while scanning for networks
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Ubuntu: Ubuntu Geek - Ubuntu Tutorials,Howto's,Tips and Tricks
There is an interesting class of programs: audioplayers. What we expected from them? Playing music. What is required for this? Codecs, simple interface, playlist, equalizer. May be themes and control from keyboard. Many things can be applied to it, but audioplayer must stay a-music-player. This is primary task for such kind of program, and afterwards - cataloguer, tag converter, music collection organizer and so on. For this, spartanians and ancient-lovers remembers and likes simple yet powerful XMMS.
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Seahorse is a Gnome front end for GnuPG - the Gnu Privacy Guard program. It is a tool for secure communications and data storage. Data encryption and digital signature creation can easily be performed through a GUI and Key Management operations can easily be carried out through an intuitive interface.
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APG (Automated Password Generator) is the tool set for random password generation. It generates some random words of required type and prints them to standard output. This binary package contains only the standalone version of apg.
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Many system administrators may be in the habit of re-booting their systems to make partition changes visible to the kernel. With Linux, this is not usually necessary. The partprobe command, from the parted package, informs the kernel about changes to partitions.
The GNU Parted disk partition resizing program.GNU Parted is a program that allows you to create, destroy, resize, move and copy hard disk partitions. This is useful for creating space for new operating systems, reorganising disk usage, and copying data to new hard disks. This package contains the Parted binary and manual page.
Parted currently supports DOS, Mac, Sun, BSD, GPT, MIPS and PC98 disklabels/partition tables, as well as a ‘loop’ (raw disk) type which allows use on RAID/LVM. Filesystems which are currently fully supported are ext2, ext3, fat (FAT16 and FAT32), ReiserFS (with libreiserfs) and linux-swap. Parted can also detect and remove HFS (Mac OS), JFS, NTFS, UFS (Sun and HP), XFS and ASFS/AFFS/APFS (Amiga) filesystems, but cannot create, resize or check these filesystems yet.
Note that ReiserFS support is only enabled if you install the libreiserfs0.3-0 package. Since libreiserfs0.3-0 has been removed from sarge, ReiserFS support is not compiled in the default package.
The nature of this software means that any bugs could cause massive data loss. While there are no known bugs at the moment, they could exist, so please back up all important files before running it, and do so at your own risk.
Now we need to install parted because partprobe is a part of parted package
Install parted in debian
#apt-get install parted
Now this will install partprobe and parted.Partprobe inform the OS of partition table changes. partprobe is a program that informs the operating system kernel of partition table changes, by requesting that the operating system re-read the
partition table.
Syntax
partprobe [-d] [-s] [devices…]
-d Donât update the kernel.
-s Show a summary of devices and their partitions.
-h Show summary of options.
-v Show version of program.
Using partprobe
#partprobe
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.Debian: Debian Admin Step By Step Tutorials and articles with screenshots
If you want to convert .nrg file to .iso file you can use nrg2iso tool to create this. nrg2iso is a program that extracts ISO9660 data from Nero “.nrg” CD-ROM image files.
#apt-get install nrg2iso
Using nrg2iso
Usage
nrg2iso [nrg-file] [iso-file]
Example
nrg2iso image.nrg image.iso
Now you can burn your iso with your preferred linux burning app.
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gSTM, the Gnome SSH Tunnel Manager, is a front-end for managing SSH-tunneled port redirects. It stores tunnel configurations in a simple XML format. The tunnels, with local and remote port redirections, can be created, deleted, modified, and individually started and stopped through one simple interface. It is useful for anyone wanting to securely access private services over an encrypted tunnel.
Install Gnome SSH Tunnel Manager in Ubuntu
First you need to download the .deb package from here using the following command
wget http://kent.dl.sourceforge.net/sourceforge/gstm/gstm_1.2_i386.deb
Once you have the gstm_1.2_i386.deb package you need to install this using the following command
sudo dpkg -i gstm_1.2_i386.deb
This will complete the installation.
If you want to open this application go to Applications—>Internet—>gSTM

Once it opens you should see the following screen

If you want to add ssh tunnel you need to click on add now you should see the following screen here you need to enter the name of the tunnel and click ok

Once you click ok you can see the following screen here you need to fill all the required detailed for your host and click ok

If you want to add a port redirection you need to select add under portforwarding in the above screen

Once you click on ok you should see the following screen if you want to connect to SSH tunnel select your host and click on start it should start connecting to your host

Examples
Remote Desktop
Remote Desktop to various Windoze servers in the private LAN. Although Remote Desktop supports some degree of encryption itself and you can easily create a port-forward in your firewall. First of all you don’t want to create a port-forward for every desktop you want to reach. Second and most important, you don’t want the Remote Desktop ports open for the world to see… for obvious security reasons.
Secure POP3
If you are running a POP3 service on your *nix router/server you are probably aware of the fact POP3 is an unencrypted, plain-text protocol. Hypothetically this means any ‘man-in-the-middle’ is able to read your username, password and e-mail content. Obviously, on your private LAN this isn’t a problem, however you might want to read your mail over the internet one day…
One solution would be to install pop3s or better yet, imaps. However there is another way, without having to install additional services: an SSH tunnel.The way it works is, you connect to your router/firewall through ssh and set up a portredirect over it (ie. a tunnel). You can then connect your e-mail client to your localhost. The connection will then be redirected over the encrypted SSH connection to your POP3 service. Et voila, a secure POP3 connection.
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Debian: Debian Admin Step By Step Tutorials and articles with screenshots
Debian: Debian Admin Step By Step Tutorials and articles with screenshots
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