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 From:  Lee Sharp <leesharp at hal dash pc dot org>
 To:  m0n0wall at lists dot m0n0 dot ch
 Subject:  Re: [m0n0wall] Pass-through MAC vs Allowed IP Address - Sorry used the wrong email account to reply
 Date:  Mon, 26 Dec 2011 09:38:58 -0600
On 12/25/2011 11:15 PM, GD Incorporation wrote:
>> What happens if you shut everything down for one minute?  And, what are the
> clients?  Some of the newer Windows will "detect" a Internet connection, and
> if it goes down, the system goes offline.
> - The clients are mostly from windows XP to windows 7 and few macs. The ones
> with problems are windows 7 clients (PC and laptop) and one Mac. But after a
> long shutdown (1 minute) the windows worked back normal, have not tried with
> the mac.

This sounds like a captive portal "freezing" issue I have seen before. 
When this is happening, can un unrecognized client log in normally?

>> The system runs from memory, so a corruption of the image is not likely.
>>   However, with bad power, a corruption of the memory can happen.  Also,
> you could have bad memory.  Get a UBCD or an Ubuntu CD and boot to memtest
> x86+ and see if your memory is good.  (Let it run for two passes at least)
> You may also want to look at a line conditioner.  This is more than a cheap
> UPS...  But a cheap DIY way to get one is a car battery, an inverter, and a
> battery charger.  It will be noisy power, but perhaps cleaner than what you
> have.
> I tried different memory checker and the memory is OK. At least it is good
> to know that the firewall runs on memory :) And I am getting some secondhand
> cheap UPS and just replace the battery to handle this :) But reading from
> your info, it seems that it may be even better to allow power failure to do
> the automatic shutdown from time to time to make sure the memory refresh
> frequently :) (just kidding .....)

The problem with most UPSs is that they will not condition the line.  If 
the power is sporadic enough to mess with the computer, the UPS may not 
catch it.