Sorry, just saw another post of Heinrich telling the exact same thing... 
should of read the other responses first :$

Michel Servaes schreef:
> I download the CONFIG file, search for the DHCP range that monowall 
> proposes... change it with an editor (wordpad will do just fine), and 
> upload it again to monowall (sure it restarts after a reload, but then 
> your DHCP range is within your choice)
> This is indeed a known bug in b16
>
> Brad Hunt schreef:
>> It is a known bug with b16 and is supposed to be addressed in the next
>> BETA.
>>
>> Brad Hunt
>> IT Manager
>> Z International, Inc.
>> Phone: 816-235-7546 Fax: 816-235-7566
>> Email: bhunt at zintl dot com
>>
>> -----Original Message-----
>> From: Tobias Roth [mailto:misc dot lists at fsck dot ch] Sent: Sunday, June 28, 
>> 2009 1:21 PM
>> To: m0n0wall at lists dot m0n0 dot ch
>> Subject: Services: DHCP server buggy
>>
>> Hi
>>
>> When I click save on the "Services: DHCP server", it complains:
>>
>> The following input errors were detected:
>>
>>     * The field 'IPv6 Range begin' is required.
>>     * The field 'IPv6 Range end' is required.
>>
>>
>> I don't see these fields, and I don't use IPv6. This is Monowall 1.3b16.
>>
>> Thanks,
>> Tobias
>>
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>>