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#6277 - 08/22/05 09:37 AM Mac address =] (Nice)
Karma Offline
Junior Member

Registered: 08/02/05
Posts: 10
Loc: Lithuania
Hi all. Its me again. This time i want to know something about Mac address. Do you know about it ? . You see. I have i little program which changes your's mac address. I have a LAN network. On this LAN there is a lot of PC connected. So i figured out that i can change my mac address into somebody else. And obviously the IP Address. If i do that. Will i have that PC internet ??? (If that PC is off line) I dont say i will do it but i want to know more about this Mac address.
P.S. I know that my English is bad sry.
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#6278 - 08/22/05 09:49 AM Re: Mac address =] (Nice)
Ghost Offline


Registered: 06/16/03
Posts: 807
Loc: Wisconsin
The MAC address or Medium Access Control address is used by the Ethernet protocol to determine if a packet was directed toward you machine's Network Interface Card. If the MAC address in the Ethernet header of a packet does not match that of your NIC card, the NIC card simply ignores the packet. By using the address resolution protocol (ARP), you can resolve an IP address to a MAC address to ensure that your machine sends the correct MAC address in the Ethernet header of a packet.

By changing your MAC or IP address to match that of another machine on your subnet, you will cause IP and/or MAC conflicts. Doing so will result in loss of connectivity to the network.
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#6279 - 08/22/05 09:59 AM Re: Mac address =] (Nice)
Infinite Offline



Registered: 03/09/02
Posts: 1041
Loc: Canada eh
MAC - Media Access Control

What ghost said is correct. MACs are only significant on the local segmnt you are on. When packets cross a router the mac in the packet changes.

The only real use of spoofing a mac is for man-in-the-middle attacks. Other than that you can't do shit with em. No you will not get internet.

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#6280 - 08/22/05 10:05 AM Re: Mac address =] (Nice)
Karma Offline
Junior Member

Registered: 08/02/05
Posts: 10
Loc: Lithuania
Hmmmm... So what to do if i wont to take others PC Mac and match to the Nic address (is it possible to change the Nic) ? (If the PC from which i take the Mac is Shut Down)


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#6281 - 08/22/05 10:06 AM Re: Mac address =] (Nice)
Ghost Offline


Registered: 06/16/03
Posts: 807
Loc: Wisconsin
There's no such thing as a NIC address.
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#6282 - 08/22/05 10:12 AM Re: Mac address =] (Nice)
Karma Offline
Junior Member

Registered: 08/02/05
Posts: 10
Loc: Lithuania
Ohhh. I see.


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#6283 - 08/22/05 10:17 AM Re: Mac address =] (Nice)
Karma Offline
Junior Member

Registered: 08/02/05
Posts: 10
Loc: Lithuania
Thanx for info


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#6284 - 08/22/05 10:18 AM Re: Mac address =] (Nice)
Infinite Offline



Registered: 03/09/02
Posts: 1041
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#6285 - 08/22/05 10:08 PM Re: Mac address =] (Nice)
§intå× Offline


*****

Registered: 12/03/02
Posts: 3255
Loc: Maryland
the NIC card is assigned a MAC address, as is everything local you have. The first several digits in a mac address are the vendor and the modle of the device.

For example
00-0E-7F-2A-FC-65

00-0E-7F
might tell me this is a "intel" modle "NIC2357"

Or a "Cisco" "4600"

Modle number are made up, I am on phone with customer so no time to think deep.
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#6286 - 08/24/05 09:46 AM Re: Mac address =] (Nice)
pergesu Offline
UGN Elite Poster

Registered: 03/14/02
Posts: 1136
Loc: Pimpin the Colorizzle
You don't need to change your MAC address to receive other packets though...just put your NIC in promiscuous mode.

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#6287 - 08/25/05 09:26 AM Re: Mac address =] (Nice)
§intå× Offline


*****

Registered: 12/03/02
Posts: 3255
Loc: Maryland
change you mac addrress... lol what with a new nic card?
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#6288 - 08/25/05 10:00 AM Re: Mac address =] (Nice)
KillHour Offline

*

Registered: 04/15/05
Posts: 247
Loc: Tonawanda, NY
Quote:
Originally posted by int:
change you mac addrress... lol what with a new nic card?
A mac address is actually rather easy to change with the right program. Thinking that a mac address is permanent is a mistake that many admins make when they use it as verification. I've gotten admin access at many "passwordless" computer networks, simply by changing the mac address.
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#6289 - 08/25/05 07:32 PM Re: Mac address =] (Nice)
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Registered: 12/03/02
Posts: 3255
Loc: Maryland
Oh my, Do explain!!!
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#6290 - 08/25/05 08:38 PM Re: Mac address =] (Nice)
KillHour Offline

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Registered: 04/15/05
Posts: 247
Loc: Tonawanda, NY
Personally I use SMAC for spoofing my MAC on computers that don't allow me to change it through the control panel. You can also do it through the registry, but it's easier just to use a program.

Also, if you want to know how to do something, you could Google it.

Any questions?
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#6291 - 08/26/05 01:01 AM Re: Mac address =] (Nice)
sinetific Offline
nobody

Registered: 03/02/02
Posts: 815
Loc: Ann Arbor
What mac spoofing is good for is networks that do DHCP based on mac. Even ISPs do this but to what extent and off of what peice of hardware is depends on thier setup. On a few networks I set up, you cant get an IP unless your MAC is registered. If you spoof someone elses MAC that is registered when they aren't online your good to go. If another machine already has the IP the DHCP server won't had out that address until its lease expires.

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