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Blocking dhcp to some clients (airport extreme's)
- To: misc_(_at_)_openbsd_(_dot_)_org
- Subject: Blocking dhcp to some clients (airport extreme's)
- From: Bill <Bill_(_at_)_explosivo_(_dot_)_com>
- Date: Thu, 29 Sep 2005 10:23:37 -0400
OpenBSD 3.7 / generic kernel / stock dhcp and stuff
This was just one of those calls to tech support that left me shaking
my head. We have a bunch of Apple airports and
Apple airport extremes (AE). We are having them assign out a part of
the network different than the main dhcp server so we can
tell who the wi-fi users are. The original airports are okay, but the
extremes seem to ignore thier settings and just pull from the networks
dhcp pool instead of what we programmed into them.
Hence my strange tech support call.
Essentially apple said:
Your DHCP server is sending out a signal that tells the airport
extreme to override its settings and use the main dhcp server. The
older airports were not as sensitive which is why they work.
Phooey on them. I was not aware that DHCP servers sent out any sort of
advertisement or signal to override other equiptment.
So I want to block all dhcp traffic to the AE units. I've been
checking to see if there was a way to do it in dhcpd.conf, but I cannot
I am thinking pf on the dhcp server to those specific ip
addresses (wifi static ips) killing DHCP traffic. Since the AE already
has its own static IP and is set with dhcp info internally, maybe it
would decide its on its own and actually work like its set up to
Is this the best way to compensate? Is there really a mysterious DHCP
signal that goes out and overrides stuff?
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