From owner-freebsd-net@FreeBSD.ORG Tue Aug 6 09:38:36 2013 Return-Path: Delivered-To: freebsd-net@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [8.8.178.115]) (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTP id 43CE9D48 for ; Tue, 6 Aug 2013 09:38:36 +0000 (UTC) (envelope-from andrnils@gmail.com) Received: from mail-oa0-x22b.google.com (mail-oa0-x22b.google.com [IPv6:2607:f8b0:4003:c02::22b]) (using TLSv1 with cipher ECDHE-RSA-RC4-SHA (128/128 bits)) (No client certificate requested) by mx1.freebsd.org (Postfix) with ESMTPS id 0A62D2375 for ; Tue, 6 Aug 2013 09:38:35 +0000 (UTC) Received: by mail-oa0-f43.google.com with SMTP id i10so305113oag.30 for ; Tue, 06 Aug 2013 02:38:35 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type; bh=EuS3ksO57ooF9LN8Jk0rTdtaF76zca7LVqgL1IhvidA=; b=amM3INeNL1D6irDNSO5yitXv1jlpWvZauCnSbbImFLp9/95RdXgTXnczvdtIW65LQd jT/TZv5ovdxXLjgH6/30TJVL6PN1KeBDsx8BhEc0GjZeRa1LPqR6Yr3AVWJNuFyFhp4Q 1vksu7aQElm2YEx1NtwlDXspfc8+8suaA2nDLX5wKnGq0bT3a2K1oXxF4QQEa2yKK+Zg mOszmwPo13eW2vwWfCJNbtW7lKCmLvh/yGIR1RaA8cGBrpzhdbREMkTr7VbM7ldxuerV MeBBHT8XpOuVCtUq4yHVv7Dr09Mk0muBwULKh1+5691489RjnVHOGRRIhWal8fgyfvgQ nYaw== MIME-Version: 1.0 X-Received: by 10.182.118.129 with SMTP id km1mr366915obb.15.1375781915271; Tue, 06 Aug 2013 02:38:35 -0700 (PDT) Received: by 10.76.108.143 with HTTP; Tue, 6 Aug 2013 02:38:35 -0700 (PDT) In-Reply-To: References: Date: Tue, 6 Aug 2013 11:38:35 +0200 Message-ID: Subject: Re: how define network with mask 8 for dhcp server? From: Andreas Nilsson To: s m Content-Type: text/plain; charset=ISO-8859-1 X-Content-Filtered-By: Mailman/MimeDel 2.1.14 Cc: Olivier Nicole , FreeBSD Net , Olivier Nicole X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 06 Aug 2013 09:38:36 -0000 On Tue, Aug 6, 2013 at 11:29 AM, s m 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 wrote: > >> >> >> >> On Tue, Aug 6, 2013 at 10:59 AM, Andreas Nilsson 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 >> >> >