.vimrc file

This file can be used to set preferences for the vim. Following are some of
settings frequently used by me.

“syntax enable” Enables programming language syntax high lighting.
“set background=dark” Makes the background in the vim to be dark.

Last Updated on October 4, 2006 by SK

Mounting Samba shares in Linux client

Samba shares cannot be nfs mounted in the linux client. They have to be mounted using smbmount or mount -t smbfs option. To do this, check to see if the smbfs package has been installed in your system. If not, install the smbfs package by doing the following.

#apt-get install smbfs

Note: In my case I had a latest version of samba-common package that the one required by the smbfs in the apt repository. I removed the samba-common package by doing “apt-get remove samba-common”. Then proceeded with the above mentioned command.

Once the installation is done, check to make sure you have “smbmount” installed in /usr/bin directory.
Issue the following command.
#smbmount // /home/kriss/nfsvideo -o username=kriss,dmask=77,fmask=777

Note: My samba share in the server exports “/home/video” directory as “video” share. Don’t provide the complete path for the share directory, just provide the share name as above. Replace “kriss” with the user name in the server.

You will be asked for the password the username you specified. Once it is successful you will see the share mounted in the local directory (/home/kriss/nfsvideo).

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Last Updated on September 8, 2006 by SK

System Recovery in Ubuntu after a configuration file change

I modified xorg.conf file to remove synaptics driver from starting up (before modifying any file , it is a good idea to save the original as *.original file, in this case save the xorg.conf to xorg.conf.original). However, after this change the xserver wasn’t starting. To fix this, I had to boot the laptop using the kbuntu cdrom and mount the harddisk. Once mounted I was able to access the /etc/ directory and copied the original xorg.conf file to replace the file I modified. Here are the steps:

1. Boot using kbuntu live cdrom.
2. Mount the hard disk: The primary ide drive is always hda1.
#mount /dev/hda1 /mnt/harddisk
3. Change to /mnt/harddisk and access the /etc/X11 directory.
4. Copy the xorg.conf.original file to xorg.conf.
5. Reboot the system.

Now the system should be up and running.

Last Updated on September 6, 2006 by SK

Ubuntu In Laptop – Enabling TKIP in Linux

Ubuntu WPC54g card installation with TKIP Enabled

Finally I got the WPC54g working in my Dell c610 laptop.

My home network has the SSID broadcasting disabled and uses PSK-TKIP security. It was a big pain in the neck to use the open source ndiswrapper and wpa_supplicant. This weekend I stumbled on this little company called Linuxant (hmm.. where are they located?) that provides an easy to use driver loader for a nominant price of $19(US). They allow you to try the software for upto a month. I don’t mind paying that for a linux company if it really works and makes my life easier.

Did I make the right decision to go with Linuxant’s driver loader. Oh yes, it is a breeze to install the driver. Honestly this is the first time I’ve experienced a browser based install for a linux software. Here are the steps in brief to install the software. I will add more information if anybody needs.

1. Download linuxant’s excellent installation tool.
2. Run the dldrdriverloader.run, it will launch a web browser and will ask for windows driver .ini file and
3. download wpa_package from the link in linuxant’s website. For more about wpa_supplicant see here.
4. build it using the dldrwpaconfig tool
5. Use KWifiManager to monitor the signal strength
6. Open /etc/wpa_supplicant.conf file and add the following.


ssid=”example wpa-psk network”
psk=”secret passphrase”
7. If needed do /etc/init.d/dldrdriverloader restart
8. Launch KWifiManager to see if the wireless network is connected.
9. You can either use iwconfig/ifconfig or use the network config tool to activate the wlan0 interface.

Your wireless connectivity should be up and running now.

Last Updated on September 5, 2006 by SK

MP3 Player for Fedora

Fedora doesn’t come with an MP3 player by default. By the way if u want to play mp3 files right out of the box, then Fedora is not a good option. Try the excellentSimplyMEPIS, an excellent distro based on debian. It comes with every thing required for a desktop system. For those of you with no choice other than Fedora due to various reasons the only way out to is to follow this simple instruction to install a plugin for the Rhythmbox player.

Last Updated on September 5, 2006 by SK

Ubuntu Installation In Laptop

1. Install Ubuntu with default options.
2. Install Ubuntu updates.
3. Setup screen saver.

Update Packages with Synoptic Package Manager
1. Select Ubuntu 5.10 “Breezy Badger” (Binary)
2. Add “Community Maintained (Universe)” version.
3. Added “gcc”, make, kernel sources, iptables development libraries,svn,

Install linuxant driver:
1. Download dldrinstall.run file.
2. Run dldrinstall.run file. This will unpack and install the driver. Then it will ask you to launch the brower and point it to the Follow the instruction and download the appropriate windows driver (in my case it is wpc54g driver).
3. Buy the linuxant driver for 19.95. Follow the instructions to generate the license key. Input the license key in the webpage. Now your driver is installed.

Install and Configure wpa supplicant:
1. Go to http://www.linuxant.com/driverloader/wlan/full/downloads.php page to download wpa supplicant for debian package.
2. Install the package using “dpkg -i filename” command.
3. Installation will ask you run the command “/usr/sbin/dldrwpaconfig” from root shell. Run it.
4. When it asks the question “Do you want to compile supplicant with OpenSSL support” say “yes”.
5. It will ask you “the configuration script supports only wpa-psk” say “yes”
6. It will ask you the wpa preshared key. Supply the pre shared key.
7. Go to the networking tool and activate the wireless interface. (make sure you specify the static IP incase if you use static IP configuration.
8. Now your wireless connection should be up and running.

Last Updated on September 5, 2006 by SK

libipq links for working with iptables in linux




TCP syn attack

Summary of the netfilter developer workshop 2004

Harald Welte


Linux netfilter Hacking HOWTO

Linux 2.4 NAT HOWTO

Netfilter Extensions HOWTO

Rusty’s Unreliable Guide To Kernel Hacking

IP Tables Tutorial

IP Table Source Code

NetFilter Wiki

Rusty’s Remarkably Unreliable Guides

Unreliable Guide To Hacking The Linux Kernel

Unreliable Guide To Locking

IPTable extension writing tutorial

netfilter module example

Last Updated on September 5, 2006 by SK