Dhcpd versus Windows Vista

Shane Kerr Shane_Kerr at isc.org
Mon Mar 12 17:00:28 UTC 2007

Hash: SHA1


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. ;)

- --

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://support.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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