From owner-freebsd-net@freebsd.org Wed Jun 19 20:39:50 2019 Return-Path: Delivered-To: freebsd-net@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id D982515C984A; Wed, 19 Jun 2019 20:39:50 +0000 (UTC) (envelope-from eugen@grosbein.net) Received: from eg.sd.rdtc.ru (eg.sd.rdtc.ru [IPv6:2a03:3100:c:13::5]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "eg.sd.rdtc.ru", Issuer "eg.sd.rdtc.ru" (not verified)) by mx1.freebsd.org (Postfix) with ESMTPS id B5B7B81FBD; Wed, 19 Jun 2019 20:39:39 +0000 (UTC) (envelope-from eugen@grosbein.net) X-Envelope-From: eugen@grosbein.net X-Envelope-To: freebsd-net@freebsd.org Received: from [10.58.0.4] (dadv@[10.58.0.4]) by eg.sd.rdtc.ru (8.15.2/8.15.2) with ESMTPS id x5JKdXgc093381 (version=TLSv1.2 cipher=DHE-RSA-AES128-SHA bits=128 verify=NOT); Thu, 20 Jun 2019 03:39:33 +0700 (+07) (envelope-from eugen@grosbein.net) Subject: Re: Eliminating IPv6 (?) To: "Rodney W. Grimes" References: <201906191618.x5JGIDWa018900@gndrsh.dnsmgr.net> Cc: freebsd-net , FreeBSD Questions Mailing List , "Ronald F. Guilmette" From: Eugene Grosbein Message-ID: <42461287-c282-697e-6a21-571212dff832@grosbein.net> Date: Thu, 20 Jun 2019 03:39:28 +0700 User-Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:45.0) Gecko/20100101 Thunderbird/45.8.0 MIME-Version: 1.0 In-Reply-To: <201906191618.x5JGIDWa018900@gndrsh.dnsmgr.net> Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: B5B7B81FBD X-Spamd-Bar: / Authentication-Results: mx1.freebsd.org; spf=permerror (mx1.freebsd.org: domain of eugen@grosbein.net uses mechanism not recognized by this client) smtp.mailfrom=eugen@grosbein.net X-Spamd-Result: default: False [0.60 / 15.00]; ARC_NA(0.00)[]; NEURAL_HAM_MEDIUM(-0.58)[-0.584,0]; RCVD_TLS_ALL(0.00)[]; FROM_HAS_DN(0.00)[]; RCPT_COUNT_THREE(0.00)[4]; MX_INVALID(0.50)[greylisted]; NEURAL_SPAM_SHORT(0.62)[0.620,0]; MIME_GOOD(-0.10)[text/plain]; DMARC_NA(0.00)[grosbein.net]; TO_MATCH_ENVRCPT_SOME(0.00)[]; TO_DN_ALL(0.00)[]; R_SPF_PERMFAIL(0.00)[]; NEURAL_SPAM_LONG(0.16)[0.158,0]; IP_SCORE(0.00)[country: RU(0.01)]; FROM_EQ_ENVFROM(0.00)[]; R_DKIM_NA(0.00)[]; MIME_TRACE(0.00)[0:+]; ASN(0.00)[asn:29072, ipnet:2a03:3100::/32, country:RU]; MID_RHS_MATCH_FROM(0.00)[]; SUBJECT_HAS_QUESTION(0.00)[]; RCVD_COUNT_TWO(0.00)[2] X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 19 Jun 2019 20:39:51 -0000 19.06.2019 23:18, Rodney W. Grimes wrote: >> 19.06.2019 3:57, Ronald F. Guilmette wrote: >> >>> And god only knows how much will break once I've done that. >> >> IPv6 will break only. > > That is incorrect, scripts that would silently do nothing can > now infact fail, trust me, first hand experience. This can > have consequences beyong "IPv6 will break only". > >>> How many other >>> people have tested -all- of the resulting binaries, seriously, on actual >>> production systems? (I may be the first one ever, at least for 12.0.) >> >> I ran plenty of hosts with IPv6 disabled this way and no problems observed, but this pre-dates 12.0. > > I've not run a userland without V6 in a long time once I started to have > issues with some things. Can you give an example of such script in base system, please? If you have such script or binary not in our base, it's not our fault :-)