HOW TO CHANGE MAC ADDRESS ?

every network interface card(nic) have this mac address
this number was given by the manufacturer
usally a mac address is written in a 12 digit hexadecimal number
for example 00-13-3f-7f-d7-27
to find mac address winkey+r-->cmd--->ipconfig /all

address resolution protocol(arp):-

arp is used to fin the mac address of a system of victim when ip address is known
to view arp table on the computer
to find this arp winkey+r--->cmd-->arp -a


mac address spoofing:-

this means to change the mac address follow 3 steps
step 1:- winkey+r--->ipconfig /all and note down the mac address
step 2:- download the ether change too from the site http://ntsecurity.nu/toolbox/etherchange/
step 3:- now in cmd go to the location which you install the ether change and type ether change
and follow the steps
step 4:- now disable and again enable the connection of network adopter now mac address is changed

NOW THE OTHER WAY TO CHANGE THE MAC ADDRESS MANUALLY

step1:-go to regedit and follow the location
[HKEY_CURRENT_CONFIG\System\CurrentControlSet\Control\Class\{4D36E96A-E325-11CE-BFC1-08002BE10318}]

step2:-under this key there will be serval 4 digit sub keys each represeting a perticular n/w adopter
and whose mac address you want to change should be search manually by a key
called 'driverdesc'press control+f and type driverdesc yopu can see each adoter search
until you get desired adopter.

step3:-on right hand pane you need to create or edit the string key named 'network address'
note:-data type should be reg_sz

step4:-value of the string should be the new mac address
note:- valu should be between a to f and 0 to 9 only other values comes to zero

step5:-now disable and again enable the connection of network adopter
now mac address is changed

VARIATION OF IP ADDRESSES

Internal ip address:-

the ip address of our system is called as internal ip address
it can be known by following steps
by default every os has a common ip 127.0.0.1

win key+r-->type cmd--->type ipconfig
127.0.0.1 by pinging to this no we can identify our lan card is working or not


External ip address:-

the ip address of our system which is visible to other computers is called
as External ip address this is changed by the proxy which we use.

there are several web sites to know our External ip address

They are 1)www.whatismyip.com

2)www.whatismyipaddress.com