Vista doesn't ack dhcp offer

Matt Cowger mcowger at
Thu Sep 20 18:59:37 UTC 2007

Doug, et al,

In the client side sniff, I see some discovers, but I don't see any
indication of the OFFER making it back to the client's
interface.....this would be why you don't get a successful lease on the
client side.  Sounds like your network between the DHCP server and your
client is somehow getting pissed and refusing to forward the traffic

Have you tried putting your client on the same broadcast domain to
isolate your switching gear as the problem?


-----Original Message-----
From: dhcp-users-bounce at [mailto:dhcp-users-bounce at] On
Behalf Of Doug Tucker
Sent: Thursday, September 20, 2007 11:46 AM
To: dhcp-users at
Subject: RE: Vista doesn't ack dhcp offer

Gents!  No, no, I didn't just go away :).  Here is the requested clients
sniff, sorry it took so long to get it.  Long story, and I did have to
wire connect directly to the vlan in question to even perform a sniff,
but it's done.  Please see it here:

Thanks to everyone!!

On Wed, 2007-09-19 at 13:48 -0700, Matt Cowger wrote:
> Do you have an equivalent sniff for the client side?  It might be
> useful.
> -----Original Message-----
> From: dhcp-users-bounce at [mailto:dhcp-users-bounce at] On
> Behalf Of Doug Tucker
> Sent: Wednesday, September 19, 2007 1:41 PM
> To: dhcp-users at
> Subject: Re: Vista doesn't ack dhcp offer
> Well, yes, we are running iptables on the box as well...we use the
> package for redirecting the wireless clients to an auth system.  I
> see anything unusual happen during these requests in the tables output
> though fwiw, but, it's possible I guess to be the problem...but even
> then, wouldn't we see the attempt in the dump?  It literally looks
> after the offer, it's dropped on the client side.  Doesn't look like
> client ever comes back?
> On Wed, 2007-09-19 at 12:55 -0700, David W. Hankins wrote:
> > On Wed, Sep 19, 2007 at 01:40:50PM -0500, Doug Tucker wrote:
> > >
> > 
> > These offers look correct to me, and what any client that sets the
> > broadcast bit should need and expect.
> > 
> > Are you using any kind of l2 security technology, to limit address
> > spoofing and so forth?  These sometimes trigger false positives and
> > drop the server or client packets.
> > 
> > -- 
> > Ash bugud-gul durbatuluk agh burzum-ishi krimpatul.
> > Why settle for the lesser evil?

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