how define network with mask 8 for dhcp server?

[s m]

yes, i solved my problem.
 thanks every body for your answers. it help me a lot.
SAM


On Tue, Aug 6, 2013 at 2:08 PM, Andreas Nilsson <andrnils at gmail.com> wrote:

>
>
>
> On Tue, Aug 6, 2013 at 11:29 AM, s m <sam.gh1986 at gmail.com> wrote:
>
>> thanks Andreas, that's it!!!
>> you know i have user interface program for dhcp. users don't know how
>> dhcp works and just enter desired range in text box. i should handle all
>> entered ranges. in order to do that, i should know how dhcp works with all
>> different ranges and return errors if some ranges is not equivalent like
>> the sample one.
>>
>
> Ok. Someone more versed in debugging should probably determine if the
> crash is in libc or just that dhcp does not handle malloc error.
>
>
>>
>> so. if i want to have network with mask 8, i should limit my range,
>> right? have you any suggestion what is the maximum range for netmask 8?
>> thanks for your reply again. it clears my mind:)
>>
>
> Exactly.
>
> I just tried
> 192.0.0.1-192.220.255.255 which works ( takes ~3 minutes to start, using
> 4.5gb of ram )
> and then
> 192.0.0.1-192.221.255.255 which segfaults.
>
> The machine I test on does have 16gb of ram and 16gb of swap, so there
> should be a lot more mem available.
>
> Best regards
> Andreas
>
>>
>>
>> On Tue, Aug 6, 2013 at 1:35 PM, Andreas Nilsson <andrnils at gmail.com>wrote:
>>
>>>
>>>
>>>
>>> On Tue, Aug 6, 2013 at 10:59 AM, Andreas Nilsson <andrnils at gmail.com>wrote:
>>>
>>>>
>>>>
>>>>
>>>> On Tue, Aug 6, 2013 at 10:40 AM, Olivier Nicole <
>>>> olivier.nicole at cs.ait.ac.th> wrote:
>>>>
>>>>> Sam,
>>>>>
>>>>> > my problem is to know how define a network with mask 8 and dhcp
>>>>> server
>>>>> > works correctly with it! you know if i config my dhcpd.conf like
>>>>> below, i
>>>>> > have core dump either:
>>>>> > subnet 10.0.0.0 netmask 255.0.0.0
>>>>> > {
>>>>> >     range 10.0.0.1 10.255.255.254;
>>>>> > }
>>>>> >
>>>>> > do you know how should i define my range ??
>>>>>
>>>>> The reason may be that 2^24 machines in a subnet is such a non-sense
>>>>> that dhcp simply cannot manage it.
>>>>>
>>>>> Best regards,
>>>>>
>>>>> Olivier
>>>>>
>>>>> >
>>>>> > On Tue, Aug 6, 2013 at 12:23 PM, Olivier Nicole <
>>>>> Olivier.Nicole at cs.ait.ac.th
>>>>> >> wrote:
>>>>> >
>>>>> >> Sam,
>>>>> >>
>>>>> >> > subnet 192.0.0.0 netmask 255.0.0.0
>>>>> >>
>>>>> >> I know it is not the answer to your question, but you are wrong in
>>>>> your
>>>>> >> guess that 192.0.0.0/8 is all private IPs. Only 192.168.0.0/16 is.
>>>>> >>
>>>>> >> I know that for certain because my own IP starts with 192.
>>>>> >>
>>>>> >> If you want a full /8 private, you can only use 10.0.0.0/8
>>>>> >>
>>>>> >> Bets regards,
>>>>> >>
>>>>> >> Olivier
>>>>> >>
>>>>> >> --
>>>>> >>
>>>>>
>>>>>
>>>> Well, I would guess it may run out of memory... I did a few tests:
>>>> 192.0.0.0 - 192.128.255.255 does work ( using ~2.5Gb  RAM ).
>>>> 192.0.0.0 - 192.192.255.255 does work ( using ~4Gb RAM ).
>>>> 192.0.0.0 - 192.200.255.255 does work ( using ~4.2Gb RAM ).
>>>> 192.0.0.0 - 192.224.255.255 dumps core
>>>>
>>>> Why would you want to have such a huge range?
>>>>
>>>> Best regards
>>>> Andreas
>>>>
>>>
>>> Also, a quick look at the core file gives same indications:
>>> #0  0x0000000800c67a21 in _malloc_prefork () from /lib/libc.so.7
>>> #1  0x0000000800c6b72a in malloc () from /lib/libc.so.7
>>> #2  0x000000000047b43b in omapi_object_dereference ()
>>> #3  0x00000000004844db in do_ip4_hash ()
>>> #4  0x0000000000484571 in do_ip4_hash ()
>>> #5  0x0000000000438a45 in pool_timer ()
>>> #6  0x000000000041dcd7 in trace_conf_stop ()
>>> #7  0x000000000041fc4e in trace_conf_stop ()
>>> #8  0x0000000000420698 in trace_conf_stop ()
>>> #9  0x0000000000420ecc in trace_conf_stop ()
>>> #10 0x0000000000420197 in trace_conf_stop ()
>>> #11 0x00000000004247f3 in trace_conf_stop ()
>>> #12 0x000000000041f210 in trace_conf_stop ()
>>> #13 0x000000000040f3bf in lease_pinged ()
>>> #14 0x000000000040d451 in ?? ()
>>> #15 0x00000008007d7000 in ?? ()
>>> #16 0x0000000000000000 in ?? ()
>>>
>>> Best regards
>>> Andreas
>>>
>>>
>>
>