Finding MAC addresses of all devices in LAN

As simple my last creation How to share a directory using nfs my todays creation How to find MAC addresses of all devices in LAN is also very usefull and simple. Actually its just a sharing ;)

Recently I had to find mac addresses of all servers in the local area network (LAN) for preseeding Debian installations using PXE (I will soon write about it). Finding them is easy with nmap

I used the following command and I had the mac addresses along with their associated IPs of all devices in the LAN. To find mac addresses, nmap must be run as root

nmap -sP 192.168.2.*
Starting Nmap 4.11 ( http://www.insecure.org/nmap/ ) at 2010-03-31 12:39 EDT
Host 192.168.2.1 appears to be up.
MAC Address: 00:02:B3:40:E0:AA (Intel)
Host 192.168.2.2 appears to be up.
MAC Address: 00:02:B3:40:E0:A5 (Intel)
Host 192.168.2.3 appears to be up.
MAC Address: 00:02:B3:40:E0:A5 (Intel)
Host 192.168.2.11 appears to be up.
MAC Address: 00:1B:2F:6B:B7:AC (Unknown)
Host 192.168.2.34 appears to be up.
MAC Address: 00:1F:C6:C9:A7:54 (Unknown)
Host 192.168.2.39 appears to be up.
MAC Address: 00:17:A4:93:59:EF (Global Data Services)
Host 192.168.2.50 appears to be up.
MAC Address: 00:1E:8C:04:A5:1F (Unknown)
Host 192.168.2.57 appears to be up.
MAC Address: 00:05:5D:E0:32:DF (D-Link Systems)
Host 192.168.2.71 appears to be up.
MAC Address: 00:03:47:A9:F3:D1 (Intel)
Host 192.168.2.79 appears to be up.
MAC Address: 00:1C:C0:9D:7F:9D (Unknown)
Host 192.168.2.80 appears to be up.
MAC Address: 00:1C:C0:9D:7D:51 (Unknown)
Host 192.168.2.82 appears to be up.
MAC Address: 00:15:58:32:5C:F4 (Foxconn)
…..

How to share a directory using nfs

This creation will walk you through exporting a directory so that we can read from or write to it. I will make it really simple so that in emergency situations, you are good to go within a few minutes

First install nfs server (I am on Debian 5.0, other distributions would have a the nfs package name similar to that)

aptitude install aptitude install nfs-kernel-server

After we have the nfs server installed, you need to export the directory by using the /etc/exports file. The format of the file is:

dir_to_be_exported allowed_hosts(options)

I am just about to export my home dir and allowing only 192.168.2.10 to mount it, so in /etc/exports, I would the following:

/home/linuxgravity 192.168.2.10(rw,sync,no_subtree_check)

That’s it. That was so easy, isn’t it.

Restart nfs server:

/etc/init.d/nfs-kernel-server restart

Now it is time for us to mount the shared (exported) directory to mount it on an empty directory. So while in the 192.168.2.10, first we would create a directory

mkdir /home/remote_home

Now just mount it with the following magically command:

mount 192.168.2.2:/home/linuxgravity /home/remote_home

As you have already figured out, the format is mount nfs_server_ip:exported_dir mount_point

And now you can just read from/write to /home/remote_home easily.

The whole process takes only less than two minutes ;)

ssh passwordless authentication without keys

Imagine ever wanted to avoid the hassle of typing in the password while connecting to servers using ssh? Here is a really simply neat trick that will demonstrate how easy it is to accomplish it so it does not ask for password. And as a bonus, you will notice that the connection is surprisingly much faster than you originally thought. No, it is not about ssh keys.

Suppose you could control the master which would permit you to enter the door without a key and the path it takes is always the right hand path. While you are thinking about it and saying to yourself what it has to do with ssh, allow me to tell you that you will realize once you have read the whole article how it is going to help you a lot in understanding passwordless authentication using this method.

The first thing we need is simply two lines in .ssh/config inside your home directory. If the file is not there, just create it. So the two magic lines are:

ControlMaster auto
ControlPath ~/.ssh/master-%r@%h:%p

Now connect to any host and it will ask for password. What the heck? It still asks for password, I heard you saying. That’s alright. Just put in the correct password and leave that terminal open. Open another terminal and try to connect to the same host again as in the first terminal and voila the magic…

While you are thinking about how just two key words ControlMaster and ControlPath allowed you to connect to a host without password and also much faster, let me throw in another neat trick.

If you ever wanted not to have to open another terminal, simply connect as shown below and the ssh will go into background

ssh -N -f host


Enjoy Vivek Creations :)

How to Undo a Sent Email in Gmail

Gmail is one of the biggest email service provider of Google. It gives you a vast memory of storage of above 7.49 GB during the time of writing this post. In mobiles we communicate via SMS for free of cost like wise in internet we send emails to communicate to others for free of cost. Basically every internet user owns his private email id. It’s natural that every human makes a mistake. But sending an email with mistakes might cause a problem anytime.

So, Gmail has a feature of undoing a sent email. By oversight or unintentionally if you send an email you can undo it in Gmail and the email will be saved in drafts and can be corrected and resend it again or you can trash that email. Undo is sudden option which can only be used when you accidentally send an email to others by mistake.


Steps to Undo a Sent Email in Gmail

1. Log in to your Gmail account. Now click on settings icon which you can find in left top bar. If not go to mail settings in old user interface and then you can find settings in that menu.

2. Now in settings menu you can see the ‘Labs’ option click on it. Now you will find a normal search bar where you can type anything you want in that search bar.

3. Now make a simple search for “Undo Send” extension in labs. You will find a cool Gmail Beta Plugin which helps in you in undoing a sent email by mistake in Gmail, now as soon as you Enable it and click on Save your Mail settings. Refresh your page otherwise Gmail will automatically load again so that plugin could start working in your account.

4. Now just refresh the page of Gmail to see that Gmail Beta plugin in action.

5. Now you can try once by sending an email to anyone. Go to compose email or just click on any email and select the reply option in that email. Fill the spaces you want to send email and then click on Send, now you will see email sent and you will find a small Undo Option besides it to get that email back, click that and you email will be backed up in Drafts for future use. You can edit that email and resend it or you can trash that email if you don’t want it for further use.

This feature has been introduced in Gmail since long time but yet many are still unaware of this. Don’t forget to reload the page or refresh your Gmail account once after enabling this. So, now you are not lagging behind with any new Gmail features. Now there is no word of mistake in your Gmail history.

How to Send mails from command line

Often times, we want to send log files or other emails from command line or want to script them. In this tutorial, I will show you how to do that using two mail clients mail and mutt.

Sending mails using mail:

mail (mailx is the newer version) is a fantastic program that can be used for sending email from command line or from within scripts.


The following example will send an email to admin@example.com, with subject “Apache is down” and text “Please check Apache at host name of the server”

echo “Please check Apache at `hostname`” | mail -s “Apache is down” admin@example.com



We can cat the contents of any text file, for example, log file and it will be sent to the recipient specified

cat “/var/log/apache2/error.log” | mail -s “Apache is down” admin@example.com

To attach a file, other than a text one, we need to uuencode (unix to unix encode) it before sending

uuencode banner.jpg banner_out.jpg | mail webmaster@example.com

The banner.jpg is the name of input file and banner_out.jpg is the output uuencoded file that we will be sent by mail.

To have text sent alogwith the attachment, we can cat or echo that text too

(cat /var/log/apache2/error.log;uuencode banner.jpg banner.jpg) | mail -s pic webmaster@example.com



Sending mails from using mutt:

With mutt, its same as using mail.

echo “Please check Apache at `hostname`” | mutt -s “Apache is down” admin@example.com

or we can cat the contents of a text file to show as body text

cat /var/log/apache2/error.log | mutt -s “Apache is down” admin@example.com

OR

mutt -s “Apache is down” admin@example.com

To send an empty body mail, use an empty line as the mail body:

echo | mutt -s “Software upgrades for `hostname`” admin@example.com

To attach a binary file, its even easier with mutt, just use the -a option

echo | mutt -s “New logo for the company” -a logo.gif webmaster@example.com

Hope you this creation added to your knowledge.

Delete any Facebook profile in 24 hours | Full tutorial

Actually this is not a hacking tutorial. Its only a trick by which you can delete the facebook profile of anyone. Yeah anyone ;)
This is my creation about the facebook security, so how it works what we need and how to do this ? Let me explain you in detail. If you want any help or suggestion then you can submit it in comments thanks for reading this tutorial of vivek creations Read more interesting post about Facebook here.
So, lets do it in some steps.

Step 1 : 


https://www.facebook.com/help/contact.php?show_form=memorialize_special_requests

Click Here first
This is the Url we will use to Report our slave. This Form allows you to report a deceased person (someone who is dead).



Step 2 : 


Complete the Fields: 

Explain: Full Name: Your Victims Full name(Name last name)

Date of birth: Go at his profile and click at Info tab and get his date of birth.

Account Email Addresses: Do the same thing, go to his profile and click on info tab and get his email addresses.

Networks: Again,go to his profile and click on Info tab and get his networks, copy them and paste in the form.

Web address of profile you would like to report: Just go to his profile and copy the link in the address bar.

Relationship to this person: To make more believable select Immediate Family.

Requested Action: Remove Profile Proof Of Death: This is the hardest part of this form. 

Now to make a proof of a death just Google in your language a "Death Certificate" or "Certificate of a Death". 

It doesn't matters from what country you are, Download any death certificate and edit it with the help of photoshop.
Save your image to desktop and upload it in one of the Image Free Hosting like: http://imageshack.us 
And it's done.

Yeah that is only the trick and that is only the creation. Think Think! Wink Wink ;) ;)


Now,


Additional Information: Write what you want, just write that you are in his/her family and you would like to close his/her Facebook account because you won't like that when he is dead, his Facebook is opened.
Attachment includes the note and its objects.


Finally Submit and wait for 24 hours. Please don't misuse my creation. Its only a service of facebook.
Thanks for a visitor of my creations.
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Read Also:

How to convert a Facebook profile to a Page

Facebook Status Update With XFBML Injection

VOICE MESSAGING ON FACEBOOK

Tag anyone on facebook

New Facebook Chatting Tweeking Codes

Mask My IP 2.2.5.6 | Full version Free Download

Mask My IP 2.2.5.6

Mask My IP 2.2.5.6 | 5.3 Mb

When you connect to a network, your computer has a unique identification IP-address as your home address, alerting everyone who you are and where you are. When you visit online stores, or send an e-mail, your IP address associated with this activity, and it identifies you personally. Hackers who steal personal data can get into your computer, monitor your activities, to steal your personal information. Mask My IP program will help to solve this problem. 

Key Features: 

- Hide Real IP Address 

- Surf Anonymously 

- Block ISP Eavesdropping 

- Guard Against Hackers 

- Prevent Identity Theft & Credit Card Fraud 

- Protect All Connections Including Wi-Fi 

- Defend in the Forum once be banned 

- Send Anonymous Emails 

- Easy & Effective 

- Auto / Manual IP Changing 

- 100% Clean & Safe 

- Compatible With A lot

Home Page - http://www.mask-myip.com/

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