Linux Filesystem Information – dumpe2fs

At times, you need some information about your file system. There is a utility dumpe2fs which can give you number of information about Linux file system. For example, if you want status of bad blocks on a device containing Linux file system, run dumpe2fs with option –b. It will check for bad blocks and give you information about the bad blocks it finds in a dumped file. Dumpe2fs has various arguments and options and you can get the information you need about your file system for a quick diagnosis. For more information on dumpe2fs, see its man pages.

Free OpenSource Games

What is BitTorrent ?

BitTorrent is a leading Peer 2 Peer file distribution protocol. It is a network system for the download of movies, software, music and other large files over the Internet. It’s peer 2 peer nature enables users to connect to each other directly to send and receive portions of the file. There is a tracker which coordinates the action of all such peers. The ideology of BitTorrent is that users should upload (transmit outbound) at the same time they are downloading (receiving inbound.) which ensures that the network bandwidth is utilized as efficiently as possible.

The BitTorrent network is designed to support simultaneous upload and download involving many people, also referred to as “swarms.” Its efficient network bandwidth utilization makes BitTorrent an ideal choice for those looking to download a large movie file, music file, or open software package that is currently being shared on the Internet.

Apache : Name Based Virtual Hosts

The notable difference between IP-based and name-based virtual host configuration is the NameVirtualHost directive which specifies an IP address that should be used as a target for name-based virtual hosts.

For example, we use both http://www.abc.com and http://www.xyz.com at the IP address 192.168.0.1 We simply add to one of the Apache configuration files:

NameVirtualHost 192.168.0.1
192.168.0.1>
ServerName http://www.abc.com
DocumentRoot /www/abc

192.168.0.1>
ServerName http://www.xyz.com
DocumentRoot /www/xyz

Of course, to make this work, all that is needed is to make sure that the names http://www.abc.com and http://www.xyz.com are pointing to the IP address 192.168.0.1

More information can be found at www.apache.org

OpenSource Softwares in single CD (OpenCD)

OpenCD is a collection of high quality Free and Open Source Software. The programs run in Windows and cover the most common tasks such as word processing, presentations, e-mail, web browsing, web design, and image manipulation. Includes only the highest quality programs which have been carefully tested for stability, and which we consider appropriate for a wide audience.

Check the latest series:
http://www.theopencd.org/

To download:
http://www.theopencd.org/download

To purchase:
http://www.theopencd.org/purchase

Enable IP (IPv4) Forwarding in RedHat linux

To enable IP forwarding temporarily (until the next reboot):

echo 1 > /proc/sys/net/ipv4/ip_forward

To enable permanently, edit /etc/sysconfig/network and change or add the following line:

FORWARD_IPV4 = YES

Linux PPTP VPN client configuration

With this tip you will be able to work from home using VPN and that too from Linux / FreeBSD system for the proprietary Microsoft Point-to-Point vpn server.

The Point-to-Point Tunneling Protocol (PPTP) is a method for implementing virtual private networks. It works on Data link layer (#2 layer) on TCP/IP model. PPTP Client is a Linux, FreeBSD, NetBSD and OpenBSD client for the proprietary Microsoft Point-to-Point Tunneling Protocol, PPTP. Allows connection to a PPTP based Virtual Private Network (VPN) as used by employers and some cable and ADSL internet service providers. read more…

Where are the root dns servers located ?

Thanks for the concern, but there are more than 13 root servers in the world, and we are very well protected against the DOS attack. 6 of the 13 root servers are mirrored using Anycast technology to loadbalance between multiple servers. The F Root server itself has about 37 mirrors in the world.

Read

ssh tunnelling

To Create a local ssh tunnel on your machine (port 1234 – example) to the POP3 server’s port 110. You will need to be the root user to bind to “privileged” ports

ssh -f -N -L 1234:localhost:110 user@POP3_server

Test the tunnel.
telnet localhost 1234
You should see the POP3 server’s banner information.

Allow AOL Messenger in Squid

To allow AOL Instant Messenger traffic via https with Squid, change the following line in the Squid configuration file

1. vi /etc/squid/squid.conf

2. Change:
acl SSL_ports port 443 563

To:
acl SSL_ports port 443 563 5190

3. Send the Squid process a SIGHUP or use the service command.
/sbin/service squid reload

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