Date: Tue, 6 Aug 2013 11:38:35 +0200 From: Andreas Nilsson <andrnils@gmail.com> To: s m <sam.gh1986@gmail.com> Cc: Olivier Nicole <on@cs.ait.ac.th>, FreeBSD Net <freebsd-net@freebsd.org>, Olivier Nicole <olivier.nicole@cs.ait.ac.th> Subject: Re: how define network with mask 8 for dhcp server? Message-ID: <CAPS9%2BSvGpCw%2BCCTs7Rp8DcDaXEOrJXgx2P7Kdc9h47C-gvNhTw@mail.gmail.com> In-Reply-To: <CAA_1SgHCVFMAoUL1tcuXUhYPAMduNyL-aRr-ZuHj8FywM8WhTQ@mail.gmail.com> References: <CAA_1SgERG9jQE8vApcv0GYsBhvpf9FYFW2Pw0rqGT%2B9FjP2ktQ@mail.gmail.com> <u9zjsv9rwc.fsf@banyan.cs.ait.ac.th> <CAA_1SgGR0XGPb2pCb0CaNB5xjUdubSynLOnFvzTVJGUroMyEzQ@mail.gmail.com> <CA%2Bg%2BBvgekEcdD=d8MG883ze02gnofTCV2wL7LA3gWXHSbMAUzQ@mail.gmail.com> <CAPS9%2BSuEd=az9HkJZfHv%2B4A=Nk-ZS1AzRH7FaoOOtugUr19mFw@mail.gmail.com> <CAPS9%2BSsm2VpDdu4bj33SJbpmZha74BLMmGZJVubAmDBf6eripw@mail.gmail.com> <CAA_1SgHCVFMAoUL1tcuXUhYPAMduNyL-aRr-ZuHj8FywM8WhTQ@mail.gmail.com>
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On Tue, Aug 6, 2013 at 11:29 AM, s m <sam.gh1986@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@gmail.com>wrote: > >> >> >> >> On Tue, Aug 6, 2013 at 10:59 AM, Andreas Nilsson <andrnils@gmail.com>wrote: >> >>> >>> >>> >>> On Tue, Aug 6, 2013 at 10:40 AM, Olivier Nicole < >>> olivier.nicole@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@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 >> >> >
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