Dhcpd versus Windows Vista

LS,

I experience difficulty with Windows Vista accepting a DHCP
lease from the 
isc server, from which I can not directly pinpoint the
origin of the 
problem. It appears that Vista is not accepting a lease when
it has no open 
connection to the internet.

Now I find on the microsoft this article about DHCP
problems:
http://suppor
t.microsoft.com/kb/256986/

My in depth knowledge of the DHCP process is not very good.
Can someone on 
this list tell me if the problem microsoft describes has
somthing to do 
with the problem I see.

When Vista fails to accept a lease, I see on the server log
that the server 
get a DHCP request and send a DHCP offer, but this offer is
not 
acknowledged when I am behind a closed firewall. As soon as
I open the 
firewall by configuring NAT ( I am on a privat IP range), I
see a normal 
DHCP sequence in the logfile.

If not relevant to my problem, can this microsoft bug be
relevant in 
combination with the ISC server?

Regards, Koos.

A.J. Werkman wrote:
> LS,
> 
> I experience difficulty with Windows Vista accepting a
DHCP lease from the 
> isc server, from which I can not directly pinpoint the
origin of the 
> problem. It appears that Vista is not accepting a lease
when it has no open 
> connection to the internet.
> 
> Now I find on the microsoft this article about DHCP
problems:
> http://suppor
t.microsoft.com/kb/256986/

"Description of the Microsoft Windows registry"

I think you pasted the wrong URL.

Carl K

Sorry, I posted the wrong URL.

The correct URL is:
http://support
.microsoft.com/kb/928233

Koos.



At 09:36 12-03-2007, you wrote:
>LS,
>
>I experience difficulty with Windows Vista accepting a
DHCP lease from the
>isc server, from which I can not directly pinpoint the
origin of the
>problem. It appears that Vista is not accepting a lease
when it has no open
>connection to the internet.
>
>Now I find on the microsoft this article about DHCP
problems:
>http://suppor
t.microsoft.com/kb/256986/
>
>My in depth knowledge of the DHCP process is not very
good. Can someone on
>this list tell me if the problem microsoft describes has
somthing to do
>with the problem I see.
>
>When Vista fails to accept a lease, I see on the server
log that the server
>get a DHCP request and send a DHCP offer, but this offer
is not
>acknowledged when I am behind a closed firewall. As soon
as I open the
>firewall by configuring NAT ( I am on a privat IP
range), I see a normal
>DHCP sequence in the logfile.
>
>If not relevant to my problem, can this microsoft bug be
relevant in
>combination with the ISC server?
>
>Regards, Koos.

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Koos,

I don't think your problem and the knowledge base entry are
related.

The KB article describes a problem where either the DHCP
server or something in
the network between the client and the server (like a router
or a switch) blocks
the DHCP packet from the client because the broadcast flag
is set in Vista.

However, since the server is actually issuing a lease to the
client, this is
probably not it.

You point out that everything works when you open the
firewall. Badly configured
firewalls are often a source of problems for DHCP. My
recommendation would be to
use Google, and try to find another user with a similar
setup and a solution.
Failing that, most firewalls have some documentation of some
kind. ;)

- --
Shane

A.J. Werkman wrote:
> Sorry, I posted the wrong URL.
> 
> The correct URL is:
> http://support
.microsoft.com/kb/928233
> 
> Koos.
> 
> 
> 
> At 09:36 12-03-2007, you wrote:
>> LS,
>>
>> I experience difficulty with Windows Vista
accepting a DHCP lease from the
>> isc server, from which I can not directly pinpoint
the origin of the
>> problem. It appears that Vista is not accepting a
lease when it has no open
>> connection to the internet.
>>
>> Now I find on the microsoft this article about DHCP
problems:
>> http://suppor
t.microsoft.com/kb/256986/
>>
>> My in depth knowledge of the DHCP process is not
very good. Can someone on
>> this list tell me if the problem microsoft
describes has somthing to do
>> with the problem I see.
>>
>> When Vista fails to accept a lease, I see on the
server log that the server
>> get a DHCP request and send a DHCP offer, but this
offer is not
>> acknowledged when I am behind a closed firewall. As
soon as I open the
>> firewall by configuring NAT ( I am on a privat IP
range), I see a normal
>> DHCP sequence in the logfile.
>>
>> If not relevant to my problem, can this microsoft
bug be relevant in
>> combination with the ISC server?
>>
>> Regards, Koos.
> 
> 

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On Mon, Mar 12, 2007, Shane Kerr wrote:
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>
>Koos,

>I don't think your problem and the knowledge base entry
are related.

>The KB article describes a problem where either the DHCP
server or
>something in the network between the client and the
server (like a router
>or a switch) blocks the DHCP packet from the client
because the broadcast
>flag is set in Vista.

>However, since the server is actually issuing a lease to
the client, this
>is probably not it.

>You point out that everything works when you open the
firewall. Badly
>configured firewalls are often a source of problems for
DHCP. My
>recommendation would be to use Google, and try to find
another user with a
>similar setup and a solution.  Failing that, most
firewalls have some
>documentation of some kind. ;)

Another problem I've found with commodity firewall/router
boxes
is that they tend to have dhcp enabled by default which can
be
``interesting'' if one already has a dhcpd or bootp server
on the
network.  This bit me a couple of years ago when we
installed a
LinkSys BEFVP41 VPN box on a network where a Linux server
was
running bootpd servicing diskless workstations.  I had
forgotten
that bootpd and dhcpd run on the same port.

Bill
--
INTERNET:   billCelestial.COM  Bill Campbell; Celestial
Software LLC
URL: http://www.celestial.com/  PO Box 820; 6641 E. Mercer Way
FAX:            (206) 232-9186  Mercer Island, WA
98040-0820; (206) 236-1676

Breathe fire, slay dragons, and take chances. Failure is
temporary, regret
is eternal.

A.J. Werkman wrote:
> LS,
> 
> I experience difficulty with Windows Vista accepting a
DHCP lease from the 
> isc server, from which I can not directly pinpoint the
origin of the 
> problem. It appears that Vista is not accepting a lease
when it has no open 
> connection to the internet.

Can you verify this by hooking up just the server and vista
box via a cross 
over, or a dumb hub?

Carl K