i got this problem too, but the solution on my network is block de mac and go 
to the house that are the dhcp activated, cause this traffic pass trough my 
aps... and im using ap2000 on towers... block this ports only on the server 
dont be a real solution on this case... but its can be effective if you have mk 
on the towers





> From: co...@magtelwireless.com
> Date: Thu, 9 Apr 2009 11:10:24 -0500
> To: mikrotik@mail.butchevans.com
> Subject: Re: [Mikrotik] Block DHCP server
> 
> Don't forget port 68 as well.
> 
> On Thu, Apr 9, 2009 at 10:41 AM, Josh Luthman
> <j...@imaginenetworksllc.com>wrote:
> 
> > If I wanted to block a DHCP server at a customer's house (say a Linksys
> > plugged in backwards) from the CPE (MT) what filter rules would I need?
> >
> > I have tried blocking port 67 both tcp and udp as well as src and dst - but
> > when I know a customer is providing DHCP the packet counts never go up.  I
> > am using the forward chain, this customer does not have a bridge interface.
> >
> > Josh Luthman
> > Office: 937-552-2340
> > Direct: 937-552-2343
> > 1100 Wayne St
> > Suite 1337
> > Troy, OH 45373
> >
> > Those who don't understand UNIX are condemned to reinvent it, poorly.
> > --- Henry Spencer
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