Assignment of local IP

[Nomen Nescio]

In XP when changing between admin and user accounts with the "switch user" option, I am assigned a different local IP depending on what user or admin account I am logged into. How does the hardware recognize the difference between user A and user B to do this? Is this done at the AP router or within windows itself?

[Jeff Liebermann]

On Sat, 30 Oct 2010 22:47:21 +0200 (CEST), Nomen Nescio
<nobody@dizum.com> wrote:

>In XP when changing between admin and user accounts with the "switch user" option, I am assigned a different local IP depending on what user or admin account I am logged into. How does the hardware recognize the difference between user A and user B to do this? Is this done at the AP router or within windows itself?

Try:
Start -> run -> cmd <enter>
ipconfig /all
Do this while in admin and user login. Looks for the line:
DHCP Enabled......... yes or no
If no, then you have the TCP/IP settings setup for static IP
addresses, not dynamic.

You can also create complications if you have more than one network
interface, such as wired ethernet and wireless. Each one could be
individually enabled resulting in different IP addresses while using
either the admin and user logins.

--
Jeff Liebermann jeffl@cruzio.com
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558

[Aaron Leonard]

I don't know what all y'all are talking about, when you
say this is impossible.

It is quite possible - likely even - that different users
will have different wireless profiles. E.g. user "aaron"
might have a profile that associates to SSID "SuperUsers"
while user "FerlillwussieDan" might have a profile that
associates to SSID "IrritatingTrolls". The two SSIDs could
be in different VLANs, even in completely different networks,
and thereby get different IP addresses from different ranges.

Aaron

[Alfred]

Aaron Leonard <Aaron@Cisco.COM> wrote in
news:j7t8d6pt1fr6897i18a7c50gqptb75qmlf@4ax.com:

> I don't know what all y'all are talking about, when you
> say this is impossible.
>
> It is quite possible - likely even - that different users
> will have different wireless profiles. E.g. user "aaron"
> might have a profile that associates to SSID "SuperUsers"
> while user "FerlillwussieDan" might have a profile that
> associates to SSID "IrritatingTrolls". The two SSIDs could
> be in different VLANs, even in completely different
networks,
> and thereby get different IP addresses from different
ranges.
>
> Aaron
>

Not sure I understand you. I think the OP was saying he was
getting different IPs using the SAME SSID, but different
internal usernames on an XP system. When he logs on with one
username he gets one IP and with another users name another
IP. This would indicate that the AP/Router can identify
incoming signals identity on paramaters other than MAC
address, based on internal names within the operating system
of the client computer.

[Aaron Leonard]

>> I don't know what all y'all are talking about, when you
>> say this is impossible.
>>
>> It is quite possible - likely even - that different users
>> will have different wireless profiles. E.g. user "aaron"
>> might have a profile that associates to SSID "SuperUsers"
>> while user "FerlillwussieDan" might have a profile that
>> associates to SSID "IrritatingTrolls". The two SSIDs could
>> be in different VLANs, even in completely different
>networks,
>> and thereby get different IP addresses from different
>ranges.
>>
>> Aaron
>>
>
>Not sure I understand you. I think the OP was saying he was
>getting different IPs using the SAME SSID, but different
>internal usernames on an XP system. When he logs on with one
>username he gets one IP and with another users name another
>IP. This would indicate that the AP/Router can identify
>incoming signals identity on paramaters other than MAC
>address, based on internal names within the operating system
>of the client computer.

I don't see where the OP stipulated that he/she was using
the same SSID.

Assuming that the same SSID *is* being used ... it is interesting
to ponder how or whether the described behavior might come to pass.
What springs to mind at first pass would be if the DHCP client
were smart enough to issue a different client ID depending upon
the logged in user ... perhaps a client ID that even encodes
the username. The DHCP server could then assign an IP address
accordingly.

As far as I know, however, the Windows XP DHCP client (when
operating over a LAN-like adapter) always only uses a DHCP
client ID of 0x01 followed by the 6-octet MAC address, regardless
of the logged in username.

Aaron

[Peter Pan]

"Aaron Leonard" <Aaron@Cisco.COM> wrote in message
news:4jjld6duit003o51c94evb777o663jrvts@4ax.com...
>
>>> I don't know what all y'all are talking about, when you
>>> say this is impossible.
>>>
>>> It is quite possible - likely even - that different users
>>> will have different wireless profiles. E.g. user "aaron"
>>> might have a profile that associates to SSID "SuperUsers"
>>> while user "FerlillwussieDan" might have a profile that
>>> associates to SSID "IrritatingTrolls". The two SSIDs could
>>> be in different VLANs, even in completely different
>>networks,
>>> and thereby get different IP addresses from different
>>ranges.
>>>
>>> Aaron
>>>
>>
>>Not sure I understand you. I think the OP was saying he was
>>getting different IPs using the SAME SSID, but different
>>internal usernames on an XP system. When he logs on with one
>>username he gets one IP and with another users name another
>>IP. This would indicate that the AP/Router can identify
>>incoming signals identity on paramaters other than MAC
>>address, based on internal names within the operating system
>>of the client computer.
>
> I don't see where the OP stipulated that he/she was using
> the same SSID.
>
> Assuming that the same SSID *is* being used ... it is interesting
> to ponder how or whether the described behavior might come to pass.
> What springs to mind at first pass would be if the DHCP client
> were smart enough to issue a different client ID depending upon
> the logged in user ... perhaps a client ID that even encodes
> the username. The DHCP server could then assign an IP address
> accordingly.
>
> As far as I know, however, the Windows XP DHCP client (when
> operating over a LAN-like adapter) always only uses a DHCP
> client ID of 0x01 followed by the 6-octet MAC address, regardless
> of the logged in username.
>
> Aaron

note its a *LOCAL* ip addy, not an external ip addy... there are many ways
of getting various LOCAL ip addys..... for instance, i have two wireless
adaptors on my system, each get a different LOCAL ip addy, but both have the
same EXTERNAL ip addy

[Fruity]

Aaron Leonard <Aaron@Cisco.COM> wrote in
news:4jjld6duit003o51c94evb777o663jrvts@4ax.com:

>
>>> I don't know what all y'all are talking about, when you
>>> say this is impossible.
>>>
>>> It is quite possible - likely even - that different users
>>> will have different wireless profiles. E.g. user "aaron"
>>> might have a profile that associates to SSID "SuperUsers"
>>> while user "FerlillwussieDan" might have a profile that
>>> associates to SSID "IrritatingTrolls". The two SSIDs could
>>> be in different VLANs, even in completely different
>>networks,
>>> and thereby get different IP addresses from different
>>ranges.
>>>
>>> Aaron
>>>
>>
>>Not sure I understand you. I think the OP was saying he was
>>getting different IPs using the SAME SSID, but different
>>internal usernames on an XP system. When he logs on with one
>>username he gets one IP and with another users name another
>>IP. This would indicate that the AP/Router can identify
>>incoming signals identity on paramaters other than MAC
>>address, based on internal names within the operating system
>>of the client computer.
>
> I don't see where the OP stipulated that he/she was using
> the same SSID.
>
> Assuming that the same SSID *is* being used ... it is interesting
> to ponder how or whether the described behavior might come to pass.
> What springs to mind at first pass would be if the DHCP client
> were smart enough to issue a different client ID depending upon
> the logged in user ... perhaps a client ID that even encodes
> the username. The DHCP server could then assign an IP address
> accordingly.
>
> As far as I know, however, the Windows XP DHCP client (when
> operating over a LAN-like adapter) always only uses a DHCP
> client ID of 0x01 followed by the 6-octet MAC address, regardless
> of the logged in username.
>
> Aaron


See the post from Peter Pan. Also in reading about VLANs on wikipedia,
that you mentioned earlier, it appears the host can identify
specifically what system is connecting and issue or deny DHCP or router
access based on many different paramaters, not just MAC/hostname/client
adapter name, thus yielding whatever local IP is desired or none at all
(denial).

But I am not sure how this works. Also if the OS is reported as you
indicate above, that is just another indication of what system is
connecting. I believe they can also triangulate your antennas location
fairly precisely via sensors at various locations.

Jeff often remarks that he throttles or blocks clients he does not like
but have not seem him mention how he does that.

[alexd]

Meanwhile, at the alt.internet.wireless Job Justification Hearings, Fruity
chose the tried and tested strategy of:

> Also in reading about VLANs on wikipedia, that you mentioned earlier, it
> appears the host can identify specifically what system is connecting and
> issue or deny DHCP or router access based on many different paramaters,

> But I am not sure how this works.

802.1x

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