Can DHCP happen before Windows Login

[Ganesh Jaju]

Hi,

What i want to know is that if I restart the computer and refrain from
Windows login into the machine, will it have got a IP from DHCP ?
Or is it the case that the machine gets an IP only after Windows login
happens?

I would appreciate more details on this.
Thanks in advance.

 

[Paul Adare]

On Sun, 16 Sep 2007 22:56:01 -0700, Ganesh Jaju wrote:

> Hi,
>
> What i want to know is that if I restart the computer and refrain from
> Windows login into the machine, will it have got a IP from DHCP ?
> Or is it the case that the machine gets an IP only after Windows login
> happens?
>
> I would appreciate more details on this.
> Thanks in advance.

On a wired network, yes, your machine will always get a DHCP assigned
network during the boot process. On a WiFi network it depends on the
security being used and the WiFi client software. There maybe times if
you're using 802.1x security that you don't get an IP address assigned
until a user logs on.

--
Paul Adare
MVP - Virtual Machines
http://www.identit.ca
The generation of random numbers is too important to be left to chance.

 

[Ganesh Jaju]

Thanks for the quick response.

Actually, I was asking within the 802.1x context only.
My machine is connected(wired) to a switch and going through 802.1x
authentication for host and it succeeds.

After succesful authentication, can I assume that it will be having an
IP(from DHCP server) ?

"Paul Adare" wrote:

> On Sun, 16 Sep 2007 22:56:01 -0700, Ganesh Jaju wrote:
>
> > Hi,
> >
> > What i want to know is that if I restart the computer and refrain from
> > Windows login into the machine, will it have got a IP from DHCP ?
> > Or is it the case that the machine gets an IP only after Windows login
> > happens?
> >
> > I would appreciate more details on this.
> > Thanks in advance.
>
> On a wired network, yes, your machine will always get a DHCP assigned
> network during the boot process. On a WiFi network it depends on the
> security being used and the WiFi client software. There maybe times if
> you're using 802.1x security that you don't get an IP address assigned
> until a user logs on.
>
> --
> Paul Adare
> MVP - Virtual Machines
> http://www.identit.ca
> The generation of random numbers is too important to be left to chance.
>

 

[Johan Loos]

In that case, your computer will first send his certificate (in case you use
a cert) to the switch. The switch will contact a RADIUS server. Based on the
policies on the RADIUS server your computer is authorized or not.
If the computer is authorized, he receives an ip address from the dhcp
server, otherwise, your computer will generate an apipa address.

regards
Johan
"Ganesh Jaju" <GaneshJaju@discussions.microsoft.com> wrote in message
news:74DDBEFE-3A4C-4935-8856-E29C4375DF27@microsoft.com...
> Thanks for the quick response.
>
> Actually, I was asking within the 802.1x context only.
> My machine is connected(wired) to a switch and going through 802.1x
> authentication for host and it succeeds.
>
> After succesful authentication, can I assume that it will be having an
> IP(from DHCP server) ?
>
> "Paul Adare" wrote:
>
>> On Sun, 16 Sep 2007 22:56:01 -0700, Ganesh Jaju wrote:
>>
>> > Hi,
>> >
>> > What i want to know is that if I restart the computer and refrain from
>> > Windows login into the machine, will it have got a IP from DHCP ?
>> > Or is it the case that the machine gets an IP only after Windows login
>> > happens?
>> >
>> > I would appreciate more details on this.
>> > Thanks in advance.
>>
>> On a wired network, yes, your machine will always get a DHCP assigned
>> network during the boot process. On a WiFi network it depends on the
>> security being used and the WiFi client software. There maybe times if
>> you're using 802.1x security that you don't get an IP address assigned
>> until a user logs on.
>>
>> --
>> Paul Adare
>> MVP - Virtual Machines
>> http://www.identit.ca
>> The generation of random numbers is too important to be left to chance.
>>