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Network Security Pen-Test
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Re: MAC address spoofing - conflict?

Subject: Re: MAC address spoofing - conflict?
Date: 15 Aug 2006 01:38:21 -0000
Morning Wood wrote:
What happens? Do you kick the other client off

use aireplay to deauth the original client
http://www.wirelessdefence.org/Contents/Aircrack_aireplay.htm

Yes, but once they had been deauthed they would almost undoubtedly try to 
reconnect, so that would in turn kick me off.... Wouldn't it?

In addition to this, if I'm conducting a pen test (or attempting to), I want to 
be as conspicuous as possible, and minimise my effects on the productivity of 
the company's employees, however temporary.


Pieter Danhieux wrote:
if you spoof the MAC, there are several options:
- you ask IP through DHCP -> dhcp server could refuse giving another IP if 
the MAC is still active. Depends on the implementation
- you set an IP -> if you choose the SAME ip, this will cause problems
        -> if you choose another ip, you won't see any problems. All packets 
for the authorized client, are going to be discarded by your IP stack, and 
all your packets, by his IP stack.
Right. So it depends on whether a DHCP server is in place, and, if it is, how 
it is configured?

And if you choose another IP address (manually), it doesn't matter if you have 
the same MAC as the other client or not... Doesn't this depend on what type of 
hardware it is? I suppose it depends on what is being used to route the 
packets, as (if I'm not mistaken) some do this by MAC and others by internal 
(NATed) IP?


So, if you are both connected to a wireless router, and you have decided upon a 
static IP address different to the other client's (even though you have the 
same MAC address), the packets should not go to the wrong clients, and all 
should be as if your MAC address weren't the same as the other client's anyway?


Thank you :)

Flail

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