Vista doesn't ack dhcp offer

Frank Bulk frnkblk at
Sat Sep 22 01:53:38 UTC 2007

Do you have a copy of the ACLs for us's possible that the rules
included some sort of IP/subnet mask that allowed a destination of


-----Original Message-----
From: dhcp-users-bounce at [mailto:dhcp-users-bounce at] On Behalf
Of Doug Tucker
Sent: Friday, September 21, 2007 2:52 PM
To: dhcp-users at
Subject: Re: Vista doesn't ack dhcp offer

If anyone is interested, we found it.  Our gateway router had filters on
it to allow 80, 443, 21, 22...and then deny everything else.  We added an
allow for dhcp, and wallah, everything is working.  What still has us
scratching our heads, and why we kept ruling that out, is even with the
filter in place, dhcp still worked, as long as the client dind't have the
broadcast flag set.  Makes no sense to me, either dhcp is blocked or it
isn't I would think, reguardless of broadcast client flag.  Thanks to all.

On Fri, 21 Sep 2007, Simon Hobson wrote:

> Tom Greaser wrote:
>> think this is what you want..??
> Wake up at the back there - it's been discussed, but since the OP doesn't
> have control over the machines coming onto the network he can't do that.
> Besides, it appears that the problem may have been tracked down.

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