From owner-freebsd-net@freebsd.org Wed Jun 19 19:32:02 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 0F56415C7A66 for ; Wed, 19 Jun 2019 19:32:02 +0000 (UTC) (envelope-from roberthuff@rcn.com) Received: from smtp.rcn.com (smtp.rcn.com [69.168.97.78]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 77D5F770BD for ; Wed, 19 Jun 2019 19:32:01 +0000 (UTC) (envelope-from roberthuff@rcn.com) DKIM-Signature: v=1; a=rsa-sha1; d=rcn.com; s=20180516; c=relaxed/simple; q=dns/txt; i=@rcn.com; t=1560972714; h=From:Subject:Date:To:MIME-Version:Content-Type; bh=lpikcxxBYFhoqZyK9+oyxwl4SFg=; b=MVRKKR3z6BJ8tlQBW1NtQTPPG+Up3MFXd2gt0V42HHNnyIkoSvKVxz4dMDkig6UW u4BLyxLVxOQ9l2bKkErc94u1jkK5O0fXbExfRAWEKO7qkUYasjZJ+5l85sGWKRoq bdR8GxYm3IuiBHhHNw4Kw93FurKo37m1y5bcvVAlR9tamq3h8ZzGo+a+FGnuOb0m mfHisOBuTMuKA4awaRpUJa+KXj6YTumXIe/KfJokQ1pHyXUMhynR+2LPgQoeJmfR wIJRVj6W6yGj6CTL9VNWTbtlGJCOQsCXU8P16N58i06FxfVehMHWKY46AdVEpeI6 qc7U6Odp8poWp3UTTl6jXQ==; X_CMAE_Category: , , X-CNFS-Analysis: v=2.2 cv=buYOPwSi c=1 sm=1 tr=0 a=9TgA2UwI6Wy+6BV4wQM/cQ==:117 a=9TgA2UwI6Wy+6BV4wQM/cQ==:17 a=jpOVt7BSZ2e4Z31A5e1TngXxSK0=:19 a=KGjhK52YXX0A:10 a=kj9zAlcOel0A:10 a=XRQyMpdBKAEA:10 a=dq6fvYVFJ5YA:10 a=48faUk6PgeAA:10 a=J0chH1O8E8NaSzgytHsA:9 a=CjuIK1q_8ugA:10 X-CM-Score: 0 X-Scanned-by: Cloudmark Authority Engine X-Authed-Username: cm9iZXJ0aHVmZkByY24uY29t Authentication-Results: smtp01.rcn.cmh.synacor.com smtp.mail=roberthuff@rcn.com; spf=softfail; sender-id=softfail Authentication-Results: smtp01.rcn.cmh.synacor.com smtp.user=roberthuff; auth=pass (PLAIN) Received: from [209.6.230.48] ([209.6.230.48:57221] helo=jerusalem.litteratus.org.litteratus.org) by smtp.rcn.com (envelope-from ) (ecelerity 3.6.25.56547 r(Core:3.6.25.0)) with ESMTPSA (cipher=AES256-GCM-SHA384) id C7/67-36753-AAD8A0D5; Wed, 19 Jun 2019 15:31:54 -0400 MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Message-ID: <23818.36263.312034.714296@jerusalem.litteratus.org> Date: Wed, 19 Jun 2019 15:31:51 -0400 From: Robert Huff To: "Rodney W. Grimes" Cc: "Ronald F. Guilmette" , freebsd-net , FreeBSD Questions Mailing List Subject: Re: Eliminating IPv6 (?) In-Reply-To: <201906191615.x5JGFFt7018890@gndrsh.dnsmgr.net> References: <24170.1560891451@segfault.tristatelogic.com> <201906191615.x5JGFFt7018890@gndrsh.dnsmgr.net> X-Mailer: VM 8.2.0b under 26.2 (amd64-portbld-freebsd13.0) X-Rspamd-Queue-Id: 77D5F770BD X-Spamd-Bar: ------- Authentication-Results: mx1.freebsd.org; dkim=pass header.d=rcn.com header.s=20180516 header.b=MVRKKR3z; dmarc=pass (policy=none) header.from=rcn.com; spf=pass (mx1.freebsd.org: domain of roberthuff@rcn.com designates 69.168.97.78 as permitted sender) smtp.mailfrom=roberthuff@rcn.com X-Spamd-Result: default: False [-7.86 / 15.00]; ARC_NA(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; R_DKIM_ALLOW(-0.20)[rcn.com:s=20180516]; RCVD_IN_DNSWL_LOW(-0.10)[78.97.168.69.list.dnswl.org : 127.0.5.1]; FROM_HAS_DN(0.00)[]; RCPT_COUNT_THREE(0.00)[4]; R_SPF_ALLOW(-0.20)[+ip4:69.168.97.0/24]; NEURAL_HAM_LONG(-1.00)[-1.000,0]; MIME_GOOD(-0.10)[text/plain]; NEURAL_HAM_MEDIUM(-1.00)[-1.000,0]; DWL_DNSWL_LOW(-1.00)[rcn.com.dwl.dnswl.org : 127.0.5.1]; TO_MATCH_ENVRCPT_SOME(0.00)[]; TO_DN_ALL(0.00)[]; DKIM_TRACE(0.00)[rcn.com:+]; DMARC_POLICY_ALLOW(-0.50)[rcn.com,none]; MX_GOOD(-0.01)[cached: mx.rcn.com]; NEURAL_HAM_SHORT(-0.98)[-0.982,0]; FROM_EQ_ENVFROM(0.00)[]; MIME_TRACE(0.00)[0:+]; IP_SCORE(-2.77)[ip: (-9.30), ipnet: 69.168.97.0/24(-4.58), asn: 36271(0.09), country: US(-0.06)]; ASN(0.00)[asn:36271, ipnet:69.168.97.0/24, country:US]; RCVD_COUNT_TWO(0.00)[2]; RCVD_TLS_ALL(0.00)[]; SUBJECT_HAS_QUESTION(0.00)[] 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 19:32:02 -0000 Rodney W. Grimes writes: > > And god only knows how much will break once I've done that. 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 also agree here, running a WITHOUT_IPV6 userland is both very > painful to get built AND has issues that one does not need to face, > like I showed in another thread about netstat -6. Wider question: Say I'm running a system with both IPv4 and IPv6 enabled. Stuff Happens(tm) and I want to completely disable IPv6 for some indefinite but temporary period - not chamge any configuration settings or firewall rules, but just have the code finish processing current packets (or not) and then ignore further traffic. There will be consequences; I'm prepared to accept them. Is there a single master switch - a sysctl, perhaps, or something in /etc/rc.d - that lets me do that? Respectfully, Robert Huff