On Mon, 10 Oct 2005 23:01:05 +0100, Steve Welsh <nobody@linux.bogus> wrote:

>Chuck wrote:
>> On Mon, 10 Oct 2005 14:02:44 -0400, James Knott <*email_address_deleted*> wrote:
>>
>>
>>>apngss@yahoo.com wrote:
>>
>>
>>>>3) I try it myself, when I change the MAC address, it will change the
>>>>IP address as well.
>>>>IP address is assigned by ISP, maybe ISP assigns the IP address based
>>>>on the MAC address
>>>>of the machine as well? MAC address identifies the network card, and IP
>>>>address identifies
>>>>the computer on the internet.
>>>
>>>The ISP doesn't assign an IP address based on the MAC address. It assigns a
>>>new address to what appears to be a new computer. It won't reassign the
>>>previous one, until the lease expires.
>>
>>
>> And if you try to connect using a MAC address currently in use by another
>> customer, what happens? If you appear to be an already known customer
>> (previously seen MAC address), will it assign the same IP address, will it
>> declare that IP address in use and assign another address, or wilt it declare an
>> unidentified problem and maybe disconnect both instances of the same MAC
>> address?

>Since MAC addresses don't travel off the local area network, unless you
>got some VLAN stuff going on, the chances are just a tiny bit small :)

Yup. And the smaller they are (but not zero), the longer it's gonna take your
typical clueless ISP support staff to realise that that's the cause of the
problem!

--
Cheers,
Chuck, MS-MVP [Windows - Networking]
http://nitecruzr.blogspot.com/
Paranoia is not a problem, when it's a normal response from experience.
My email is AT DOT
actual address pchuck mvps org.