Linux Blog

How-To ping IPV6 ip address

Regular ping command only works with IPv4 address. Use ping6 command to send ICMP ECHO_REQUEST to network hosts from a host or gateway.

Type the command as follows:
$ ping6 localhost
$ ping6 host.domain.com
$ ping6 IPv6-address
$ ping6 2001:db8::1428:57ab

Read ping6 man page for more information:
$ man ping6

Good place to have Linux Tattoo

Run parallel OS by using VitrualBox on OpenSuse

1) Make sure kernel-source and kernel-syms packages are installed (if not, install it from your OpenSuse installation CD), you can check using following command

poison:~ # rpm -qa | grep kernel
kernel-default-2.6.18.2-34
kernel-source-2.6.18.2-34
linux-kernel-headers-2.6.18.2-3
kernel-syms-2.6.18.2-34

2) Download and Install following rpm –> (OpneSuse) get it from here
poison:~ # rpm -ivh Xalan-c-1.10-10.i586.rpm
poison:~ # rpm -ivh Xerces-c-2.7.0-11.i586.rpm

3) Now download and install VirtualBox rpm –> here
poison:~ # rpm -ivh VirtualBox-1.3.8_openSUSE102-2.i586.rpm

4) Now add users to group vboxusers who are going to use the virtualbox using yast tool.

5) Setup the Networking via Host Bridging
Download : http://prdownloads.sourceforge.net/user-mode-linux/uml_utilities_20040406.tar.bz2

# tar xvf uml_utilities_20040406.tar.bz2
# cd tools/
# make
# make install

Do the following setup

# tunctl -t tap0 -u tux
# ifconfig tap0 0.0.0.0 up
# brctl addbr br0
# brctl addif br0 eth0 tap0
# dhcpcd br0
# ifconfig br0 up
# ifconfig eth0 0.0.0.0

6) Start the virtualbox GUI, Applications -> System -> VirtualBox

Here you can see my OpenSuse 10.2 box is running Ubuntu in virtual Box

Postfix + ClamAV + MailScanner in OpenSuse

1) Install the anti virus software (Clamav) –> (here)

rpm -ivh clamav-db-0.88.2-1.i386.rpm
rpm -ivh clamav-devel-0.88.2-1.i386.rpm
rpm -ivh clamav-server-0.88.2-1.i386.rpmrpm -ivh clamav-0.88.2-1.i386.rpm
/etc/init.d/clamd start

2. Once the anti-virus is install then we need to install the MailScanner software the RPM along with the source files can be found at http://www.sng.ecs.soton.ac.uk/mailscanner/downloads.shtml
Now get ready to install the mailscanner, this is going to take a long time.

gzip -d MailScanner-4.46.2-2.rpm.tar.gz
tar -xvf MailScanner-4.46.2-2.rpm.tar
cd MailScanner-4.46.2-2
./install.sh

3. In your MailScanner.conf file in /etc/MailScanner, there are 5 settings you need to change. The settings are:

Run As User = postfixRun As Group = postfixIncoming Queue Dir = /var/spool/postfix/holdOutgoing Queue Dir = /var/spool/postfix/incomingMTA = postfix

4. You will need to ensure that the user “postfix” can write to

/var/spool/MailScanner/incoming and /var/spool/MailScanner/quarantine
chown postfix:postfix /var/spool/MailScanner/incoming
chown postfix:postfix /var/spool/MailScanner/quarantine

5. Edit file MailScanner.conf

Virus Scanners = clamav

6. Edit virus.scanners.conf

clamav /usr/lib/MailScanner/clamav-wrapper /var/lib/clamav

7. Now we need to edit the postfix main.cf file, go all the way to the bottom of the file and add the following

header_checks = regexp:/etc/postfix/header_checks

8. In the file /etc/postfix/header_checks add this line:

/^Received:/ HOLD

9. Set the servers to run on startup and then start them

chkconfig MailScanner on
chkconfig postfix on
chkconfig clamd on
/etc/init.d/Mailscanner start
/etc/init.d/postfix start
/etc/init.d/clamd start

How-to compile Linux Kernel in OpenSuse 10.x

1) Make sure you have all the required lib for kernel compilation

2) Download the latest kernel from www.kernel.org

3) Untar the kernel source

4) Fire Following commands

# make oldconfig
# make rpm

5) This is will take some time, after compilation

Now go to — /usr/src/packages/RPMS/i386 directory and install the kernel

# rpm -ivh kernel-2.6.24.1default-1.i386.rpm
# mkinitrd --> This will create /boot/initrd-2.6.24.1-default file which is required durning booting on new kernel.

6) Go to and edit the following file to add the new kernel to boot menu

# vi /boot/grub/menu.lst and add the following lines to it

title openSUSE 10.2 - 2.6.24.1
root (hd0,5)
kernel /boot/vmlinuz-2.6.24.1-default root=/dev/hda6 vga=0×317 resume=/dev/hda7 splash=silent showopts
initrd /boot/initrd-2.6.24.1-default

You can also install new kernel using Yast tool.

7) Now install the grub using following command

# grub-install /dev/hda