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TechSavvy MV - Nov 2010

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TechSavvy MV - November edition

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Page 1: TechSavvy MV - Nov 2010
Page 2: TechSavvy MV - Nov 2010

W ork and mentally renounce the fruits achieved thereafter. Don't let the shadow of personal preju-

dice affect how you perceive work. This is the essence of karma yoga.

The wise work for common benefit whereas the ignorant work only for themselves or their near and dear ones.

A farmer has control over how he works in his fields, but not over the harvest. : "Yoga is karmasu kausalam,

doing work skillfully in the first attempt."

Work is external but our attitude to it is internal . A certain attitude may make us feel work is miserable while

another kind of attitude makes it pleasant. By cultivating the right attitude, we will become spiritual. That is

meditation.

Once in a village several people were engaged in construction of a temple A wandering sage passing by wants

to know what is happening there, so he asks a person cutting stone: "What are you doing?" The laborer replies

with frustration: "Don't you see that I am cutting stone? It's a hard stone. Look at my hands! They have be-

come red. Work is hell. And to make matters worse, you ask me what I am doing. How I wish I were not doing

this!" The sage asks: "I see you are cutting stone, but let me know what is coming up here?" The stonecutter

replies that he has no idea; it does not concern him. He is disinterested.

The sage next goes to another man and asks him the same question: "What are you doing?" The man replies:

"I'm cutting stone here; that's my job. For eight hours of work I get paid Rs 100. I have a wife and children to

take care of. I'm doing my duty." The sage asks him: "Do you know what is coming up here?" He says: "Yes,

they say they're making a temple. How does it matter to me, whether what is being constructed is a temple or a

jail, as long as I get paid?"

Then the sage goes to a third worker who is also cutting stone and poses the same question. The man replies:

"We are building a temple. There is no temple here; every year at festivals we have to trek to the temple in the

next village. You know, every time I hit the stone I hear wonderful music. The temple work has put the sleepy

village in a festive mood." The sage asks: "How long do you have to work on this project?" The man says the

timeline is not his concern for as soon as he wakes up in the morning, he gets ready for work and begins cut-

ting stone. He tells the sage that he spends the entire day here, taking a break between mealtimes. "When I go

home in the night and sleep, in my dream I think of this construction and feel grateful that I enjoy the work I

do. I am truly blessed," he said.

Three men doing the same work have three different attitudes. The first person thinks it is hell, the second

looks upon his work as his duty. However, the third worker thinks what he is able to do is a blessing.

If the work itself had the qualities inherently, good or bad, then, these three men might have felt the same. But

in reality, it's not the work itself that is good or bad.

It is not the work that disturbs us but something that's subtler; it's the attitude we have towards work. So let

this be the attitude in this festive season and further. Happy Diwali!!!

Gyan Guru

Page 3: TechSavvy MV - Nov 2010

P ranav Mistry born in 1981 in Palanpur, India is currently, a research assistant and PhD candidate at the MIT Media Lab. Pranav holds a Master in Media Arts and Sciences from MIT and Master of Design from Industrial Design Center, IIT Bombay besides his Bachelor degree in Computer Engineering

from Nirma Institute Of Technology, Ahmedabad, his hometown, which is situated in northern Gujarat in In-dia. Exposure to fields like Design to Technology and from Art to Psychology gave him a quite nice and interesting viewpoint to the world which lead to the invention of the “SixthSense”. The “SixthSense” has recently attracted global attention for its unique features.

'SixthSense' or WUW (Wear Ur World) is a wearable gestural interface that augments the physical world around us with digital information and lets us use natural hand gestures to interact with that information. By using a camera and a tiny projector mounted in a pendant like wearable device, 'SixthSense' sees what you see and visually augments any surfaces or objects we are interacting with. It projects information onto surfaces, walls, and physical objects around us, and lets us interact with the projected information through natural hand gestures, arm movements, or our interaction with the object itself. 'SixthSense' attempts to free information from its confines by seamlessly integrating it with reality, and thus making the entire world your computer.

Some of his previous works include the Mouse less - an invisible computer mouse; intelligent sticky notes that can be searched, located and can send reminders and messages; a pen that can draw in 3D; and a public map that can act as Google of physical world. Pranav’s research interests include Ubiquitous comput-ing, Gestural and Tangible Interaction, AI, Augmented reality, Machine vision, Collective intelligence and Robotics.

Sixth Sense has been awarded 2009 Invention Award by Popular Science. Pranav also won Young Innovator Award TR35 by Technology Review. In 2010, he was named to Creativity Magazine's Creativity 50. Mistry has been called "one of ten, best inventors in the world right now" by Chris Anderson.

Page 4: TechSavvy MV - Nov 2010

Another lesson A turkey was chatting with a bull. "I would love to be able to get to the top of that tree," sighed the turkey, "but I haven't got the energy. "Well, why don't you nibble on some of my droppings?" replied the bull. "They're packed with nutrients." The turkey pecked at a lump of dung and found that it actually gave him enough strength to reach the first branch of the tree. The next day, after eating some more dung, he reached the second branch. Finally after a fortnight, there he was proudly perched at the top of the tree. Soon he was promptly spotted by a farmer, who shot the turkey out of the tree. Moral of the Story: Bullshit might get you to

the top, but it won't keep you there.

Arun Kumar

Top Management ......... A woman in a hot air balloon realized she was lost. She reduced altitude and spotted a man below. She descended a bit more and shouted, "Excuse me Sir, can you help me? I don't know where I am, I had promised someone, I should be there." The man below replied, "You're in a hot air bal-loon hovering approximately 30 feet above the ground. You're between 40 and 41 degrees north latitude and between 59 and 60 degrees west longitude." "You must be an engineer", said the lady bal-loonist. "I am", replied the man. "How did you know?" "Well", answered the lady in the balloon, "everything you told me is technically correct, but I have no idea what to make of your infor-mation, and the fact is I'm still lost. Frankly, you've not been much help to me at all. If any-thing, you've delayed my trip even more." The engineer below responded, "You must be in Top Management." "I am", replied the lady balloonist, "but, how did you know?" "Well", said the Engineer, "You don't know where you are, or where you're going. You made a promise, which you've no idea how to keep, and you expect people beneath you, to solve your problems." Rahul

The employee stormed angrily into the cash-iers office. What's the meaning of this? I just counted my pay and its a dollar short!

The cashier examined the envelope, then checked his records. Last week we paid you a dollar more. You didn't complain then, did you?

Look said the employee. An occasional mis-take I can overlook - but two mistakes are too much.

Sarah John

Page 5: TechSavvy MV - Nov 2010

Vidushi Sharma scored highest percentage in MCSE

Exam held on 29th October 2010.

Team Mayur Vihar congratulates you for your efforts.

Page 6: TechSavvy MV - Nov 2010

A technical Seminar and workshop was conducted for the students of BCA and

MCA. Students were introduced to Cisco technology. Induction Speech was given

by Ms. Manisha Roy and workshop was conducted by Ms. Rajan Prabha. The

Technical Support was provided and organized by Rahul Raj.

Page 7: TechSavvy MV - Nov 2010

(Top)

Students and Staff helping

out with rangoli design.

(Right)

The Rangoli Finale...

Entire Mayur Vihar Family

posing for a cheese

moment.

Page 8: TechSavvy MV - Nov 2010

Domain Name System By Rajan Prabha Bohra

How to set up a home DNS server The Domain Name System (DNS) is the crucial glue that keeps computer networks in harmony by converting User-friendly hostnames to the IP addresses computers require to communicate with each other. DNS is one of the largest and most important distributed databases the world depends on by serving billions of DNS requests daily for public IP addresses. Most public DNS servers today are run by larger ISPs and commercial companies but private DNS servers can also be useful for private home networks Why set up a private DNS server?

This question is valid and the answer may vary depending on your home network environment. Maintaining a host

file on each client with IP/hostname mappings in a home network that contains a router and a few machines may

be sufficient for most users. If your network contains more than a few machines, then adding a private DNS

server may be more attractive and worth the setup effort. Some advantages may include:

Maintenance: keeping track of the host file for every client in your network can be tedious. In fact, it may not even

be feasible for roaming DHCP laptops or your occasional LAN party guests. Maintaining host information in one

central area and allowing DNS to manage host names is more efficient.

Cache performance: DNS servers can cache DNS information, allowing your clients to acquire DNS information

internally without the need to access public name servers. This performance improvement can add up for tasks

such as web browsing.

Prototyping: A private internal DNS server is an excellent first step to eventually setting up a public accessible

DNS server to access a web server or other services hosted on your internal network. Learning from mistakes on

an internal network can help prevent duplicate errors on a public DNS server that could result in loss of service

for external users. Note: Some ISPs require customers to have a static IP or business subscription when hosting

services in a home network environment.

A caching-only nameserver won't allow references to internal clients by hostname, but it does allow clients to take

advantage of frequently requested domains that are cached.

Caching name server

Setting up a caching nameserver using RHEL (Red Hat Enterprise Linux). The following RPMs need to be in-

stalled on the machine acting as the nameserver (use rpm -q to determine if these packages are installed):

bind (includes DNS server, named)

bind-utils (utilities for querying DNS servers about host information)

bind-libs (libraries used by the bind server and utils package)

bind-chroot (tree of files which can be used as a chroot jail for bind)

caching-nameserver (config files for a simple caching nameserver)

Cont…..

Page 9: TechSavvy MV - Nov 2010

A caching nameserver forwards queries to an upstream nameserver and caches the results. Open the file /var/named/chroot/etc/named.conf and add the following lines to the global options section: forwarders { xxx.xxx.xxx.xxx; xxx.xxx.xxx.xxx; }; #IP of upstream ISP nameserver(s) forward only; #rely completely on our upstream nameservers. The block above will cause the caching name server to forward DNS requests it can't resolve to your ISP nameserver. Save the named.conf file and then assign 644 permissions: chmod 644 named.conf Check the syntax using the named-checkconf utility provided by the bind RPM: named-checkconf named.conf Correct any syntax errors (watch those semicolons) named-checkconf reports. Monitoring the /var/log/messages file may also be helpful in debugging any errors. We now need to set the local resolver to point to itself for DNS resolution. Modify the /etc/resolv.conf file to the following: nameserver 127.0.0.1 If you are running a DHCP server on your router make sure your /etc/resolv.conf file does not get overwritten whenever your DHCP lease is renewed. To prevent this from happening, modify /etc/sysconfig/network-scripts/ifcfg-eth0 (replace eth0 with your network interface if different) and make sure the following settings are set: BOOTPROTO=dhcp PEERDNS=no TYPE=Ethernet Go ahead and start the nameserver as root and configure to start in runlevels 2-5: service named start chkconfig named on

Testing The bind-utils RPM contains tools we can use to test our caching nameserver. Test your nameserver using host or dig and querying redhat.com: dig redhat.com ;; Query time: 42 msec ;; SERVER: 127.0.0.1#53(127.0.0.1) From the above dig query you can see it took 42 msec to receive the DNS request. Now test out the caching ability of your nameserver by running dig again on the redhat.com domain: dig redhat.com Query time: 1 msec SERVER: 127.0.0.1#53(127.0.0.1) We dropped from 42 msec to 1 msec after the previous DNS query was cached. Caching is working! Let's now put the cache to work by configuring the clients to use the new caching nameserver.

Client Configuration For Linux and Windows clients you may have a couple of options for your resolver configuration depending on your network environment: If you have a router and your client's IP address is assigned via DHCP from the router, then you can use the router to assign the primary nameserver during the DHCP lease requested from the client. Log in to your router and make sure your primary nameserver points to your caching nameserver IP address in the router DHCP settings. For Linux clients, you can set up the resolver in the same procedure as the nameserver by modifying the /etc/resolv.conf file. For Windows clients you will need to set the nameserver IP address in the Control Panel -> Net-work Connections -> TCP/IP -> Properties -> Use the DNS Server Address option.

Test your new client configuration(s) using dig. You can use the nslookup command for Windows clients..

Page 10: TechSavvy MV - Nov 2010

This sportsperson is known for his individual style and personal

charisma. Identify the person and mail your answers to

[email protected] and win exciting prizes!!!

Answer to the last issue’s contest:

Kalpana Chawla

Magazine Editor: Geeta Kurup Designing and Graphics: Rahul Raj Send your feedback/suggestions @ [email protected]