From owner-freebsd-net@FreeBSD.ORG Tue Aug 6 09:29:38 2013 Return-Path: Delivered-To: freebsd-net@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTP id E9787B0F for ; Tue, 6 Aug 2013 09:29:37 +0000 (UTC) (envelope-from sam.gh1986@gmail.com) Received: from mail-lb0-x22e.google.com (mail-lb0-x22e.google.com [IPv6:2a00:1450:4010:c04::22e]) (using TLSv1 with cipher ECDHE-RSA-RC4-SHA (128/128 bits)) (No client certificate requested) by mx1.freebsd.org (Postfix) with ESMTPS id 532D0230E for ; Tue, 6 Aug 2013 09:29:37 +0000 (UTC) Received: by mail-lb0-f174.google.com with SMTP id w20so301057lbh.33 for ; Tue, 06 Aug 2013 02:29:35 -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=/cBYYwmB/ojZGh/LEsQ28GNeGdlc1JaVtjWLxu/x3ig=; b=v8+pRFcQW4HGTi9a76xNsjRGB4mefyrJb6+6daCaLHnSBvgfUpk7u8JWAoMsT5zBfG 7AyiaQm3gQCQk26zoMndBA5NBHngON0qKNjunYQpHJcA9Yk8HsAlWcrwXXOyH93Ho8Qt AwByNv0LsjY/dldc7RQd6LrKgoYEWQ4bvB/E+8fnwr5CTZkq1CT1J7JoipbnzkzVdESx 1iHjb7KvKGACYQDh5uKeYkS33DHAfIIj4fpdu3b0Azh6VBemiDoLZyywtI79QGpQdkDF 8EcB4Mi7cuRNH3mZl1qWL1eEqRwTM21YJk3avVLF+UhXHrbZ9FEE0bNCdzdr14lAXuWK 1aRg== MIME-Version: 1.0 X-Received: by 10.112.52.100 with SMTP id s4mr816254lbo.64.1375781375164; Tue, 06 Aug 2013 02:29:35 -0700 (PDT) Received: by 10.112.147.230 with HTTP; Tue, 6 Aug 2013 02:29:35 -0700 (PDT) In-Reply-To: References: Date: Tue, 6 Aug 2013 13:59:35 +0430 Message-ID: Subject: Re: how define network with mask 8 for dhcp server? From: s m To: Andreas Nilsson 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 09:29:38 -0000 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. 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:) 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 > >