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Thursday, July 17, 2008

Prevent ping/icmp attack using kernel parameter

Prevent ping/icmp attacks using kernel parameter

Write the following line in the file "/etc/sysctl.conf"
net.ipv4.icmp_echo_ignore_all = 1
Save the file & restart network service [command: service network restart]
OR
Save the file & run "sysctl -p"

We can also change the value of this runtime kernel parameter to 0 (zero) using the command:
echo "0" > /proc/sys/net/ipv4/icmp_echo_ignore_all

If the value is "1" -->> The system will ignore all icmp/ping requests.
If the value is "0" -->> The system will accept all icmp/ping requests.

Ext4 FS and File System Encryption in Fedora 9

New Ext4 File System support in Fedora 9

New features in Ext4 File System:

>> Delayed Allocation
>> Uninitialized groups
>> Online Defragmentation

More details at: http://fedoraproject.org/wiki/Features/Ext4

Encrypted File Systems

Now users don't have to bother to use a third party software to encrypt their files. This new feature will take care of data security.
Its a good and importance news for laptop users.

More details at: http://fedoraproject.org/wiki/Releases/FeatureEncryptedFilesystems



Tuesday, July 15, 2008

Installing Skype on Fedora 7

Installing Skype on Fedora 7
Instating Skype on Fedora is easy. The dependencies are only qt-4.4To install Skype using yum,

I have created a file called “skype.repo” in “/etc/yum.repos.d/” directory with the following content.

[skype] name=Skype Repository baseurl=http://download.skype.com/linux/repos/fedora/updates/i586/ gpgkey=http://www.skype.com/products/skype/linux/rpm-public-key.asc

Then, I have used the command “yum install skype” to download & install Skype and its dependencies (qt4 & qt4-x11).

Note: It may fail to install Skype with the error “GPG key parsing failed: No key found in given key data”.
If it is so, download the Skype rpm file from http://www.skype.com/download/skype/linux/choose/
Then install using “rpm –i skype-2.2.0xxxxxxxx.rpm”
 
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