From owner-freebsd-questions@FreeBSD.ORG Sat May 13 07:05:41 2006 Return-Path: X-Original-To: freebsd-questions@freebsd.org Delivered-To: freebsd-questions@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id EB7BD16A416 for ; Sat, 13 May 2006 07:05:41 +0000 (UTC) (envelope-from wingot@eftel.com) Received: from tara2.wa.amnet.net.au (tara2.wa.amnet.net.au [203.161.126.21]) by mx1.FreeBSD.org (Postfix) with ESMTP id F091243D45 for ; Sat, 13 May 2006 07:05:40 +0000 (GMT) (envelope-from wingot@eftel.com) Received: (qmail 21359 invoked by uid 89); 13 May 2006 07:05:38 -0000 Received: by simscan 1.1.0 ppid: 21348, pid: 21349, t: 0.9229s scanners: attach: 1.1.0 clamav: 0.88/m:36/d:1310 spam: 3.1.0 X-Spam-Checker-Version: SpamAssassin 3.1.0 (2005-09-13) on tara2.wa.amnet.net.au X-Spam-Level: X-Spam-Status: No, score=-2.3 required=5.0 tests=BAYES_00 autolearn=ham version=3.1.0 Received: from unknown (HELO ?192.168.1.65?) (203.161.72.123) by tara2.wa.amnet.net.au with SMTP for ; 13 May 2006 07:05:37 -0000 X-Envelope-To: nick@nickwithers.com Message-ID: <4465854F.90000@eftel.com> Date: Sat, 13 May 2006 15:05:51 +0800 From: Adrian Pavone User-Agent: Debian Thunderbird 1.0.2 (X11/20051002) X-Accept-Language: en-us, en MIME-Version: 1.0 To: Nick Withers References: <20060513045102.1555.qmail@web51603.mail.yahoo.com> <20060513153041.2feee00e.nick@nickwithers.com> In-Reply-To: <20060513153041.2feee00e.nick@nickwithers.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: Mark Jayson Alvarez , freebsd-questions@freebsd.org Subject: Re: I keep having wrong checksum in 6.1 iso download (what should I do??) X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 13 May 2006 07:05:42 -0000 Nick Withers wrote: >On Fri, 12 May 2006 21:51:02 -0700 (PDT) >Mark Jayson Alvarez wrote: > > > >>Hi, >> >>It was my second time to download a 6.1 iso from one >>of the regional ftp sites.. Lucky we have a slightly >>fast connection (155Mbps)... >> >> > >Slightly fast? What do you call fast? :-) > > > >>By the way, is it really dangerous to ignore these checksums >>that doesn't match with the published one? What's the reason >>behind this bad checksum mismatch??. >> >> > >It generally indicates that the file was corrupted during >transmission. It could, however, happen because the site you're >downloading from is serving a corrupt version. > >A checksum mismatch basically indicates that the file is not as >it should be. You may still be able to use it without any >adverse impact, but then again, you may not. It's also possible >that someone has intentionally corrupted the file for sinister >purposes. > >I'd strongly recommend not using it. It's probably worth trying >to download the file again, from another mirror. > > > >>Thanks >> >> > > > From what I read about the checksums for 6.1, the checksum was generated with a checksum actually being present in the ISO (which was then overwritten by the newly developed checksum). As such, the checksum will never match, as a checksum can never match if it is included in the file that is being checksummed (well, in theory, it is possible for it to match, but the algorithm to calculate it and processing power required is astronomically complex). It is possible I am thinking of a different FreeBSD ISO, but I am sure it was one of the 6's, and there are only 2 of those. Regards, Adrian