Cleanup the SSH known_hosts file

Posted on December 28, 2009 by Ahmed Tawfik

“ssh-keygen -R [host] “

helpful especially in clusters

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How to randomly change your MAC address on Ubuntu

Posted on December 28, 2009 by Ahmed Tawfik

“sudo apt-get install macchanger”
“sudo macchanger -A eth0”

where “eth0” is the network card you’d like to change its MAC.

Note: You have to edit your connection in Network Manager and change the old MAC with the new one, or – which is much better in my opinion – just remove the MAC from there to be obtained dynamically.

Source

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Change your hostname randomly in Ubuntu

Posted on December 28, 2009 by Ahmed Tawfik

The following script worked great:

#!/bin/bash

#random_computer_name

sudo sed -i 1,10d /etc/hostname

function randnum
{
number=$[ ( $RANDOM % 15 ) + 8 ]
}

randnum

function randpass
{
newhostname=`
}

randpass

(echo ‘0a’; echo $newhostname; echo ‘.’; echo ‘wq’) | sudo ed -s /etc/hostname

sudo /bin/hostname $newhostname

Just add the above script in a file and execute it with “sudo”.

To add this file to your startup scripts, just follow the instructions in this post

Source: here

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Change your computer’s hostname in Ubuntu

Posted on December 28, 2009 by Ahmed Tawfik

“sudo hostname new_name“

where “new_name” is the new hostname you’ll use

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How to change your network MAC address on Ubuntu

Posted on December 28, 2009 by Ahmed Tawfik

“sudo ifconfig eth0 down” #bring down the network card

“sudo ifconfig eth0 inet hw ether xx:xx:xx:xx:xx:xx up” #change the MAC and bring it back up

where “eth0” is the network adapter you wish to change its MAC and “xx:xx:xx:xx:xx:xx” is the 6 groups of numbers each composed of two hexadecimal numbers.


For more info on MAC addresses, check this link and for the source, I got it from here, thanks to suki 🙂

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