From owner-freebsd-net@freebsd.org Wed Jul 31 12:46:31 2019 Return-Path: Delivered-To: freebsd-net@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id 6A89DBDABC for ; Wed, 31 Jul 2019 12:46:31 +0000 (UTC) (envelope-from hausen@punkt.de) Received: from kagate.punkt.de (kagate.punkt.de [217.29.33.131]) (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 45zCpn2nC0z3J3q for ; Wed, 31 Jul 2019 12:46:25 +0000 (UTC) (envelope-from hausen@punkt.de) Received: from hugo10.ka.punkt.de (hugo10.ka.punkt.de [217.29.44.10]) by gate2.intern.punkt.de with ESMTP id x6VCkGme008547; Wed, 31 Jul 2019 14:46:16 +0200 (CEST) Received: from [217.29.44.222] ([217.29.44.222]) by hugo10.ka.punkt.de (8.14.2/8.14.2) with ESMTP id x6VCkEWH092585; Wed, 31 Jul 2019 14:46:15 +0200 (CEST) (envelope-from hausen@punkt.de) Content-Type: text/plain; charset=us-ascii Mime-Version: 1.0 (Mac OS X Mail 12.4 \(3445.104.11\)) Subject: Re: Preferring internal IPv6 source address over gif tunnel IP? From: "Patrick M. Hausen" In-Reply-To: <20190731120705.GC24255@straasha.imrryr.org> Date: Wed, 31 Jul 2019 14:46:14 +0200 Cc: freebsd-net@freebsd.org Content-Transfer-Encoding: quoted-printable Message-Id: References: <20190731120705.GC24255@straasha.imrryr.org> To: Viktor Dukhovni X-Mailer: Apple Mail (2.3445.104.11) X-Rspamd-Queue-Id: 45zCpn2nC0z3J3q X-Spamd-Bar: / Authentication-Results: mx1.freebsd.org; dkim=none; dmarc=none; spf=pass (mx1.freebsd.org: domain of hausen@punkt.de designates 217.29.33.131 as permitted sender) smtp.mailfrom=hausen@punkt.de X-Spamd-Result: default: False [0.06 / 15.00]; ARC_NA(0.00)[]; FROM_HAS_DN(0.00)[]; TO_DN_SOME(0.00)[]; R_SPF_ALLOW(-0.20)[+ip4:217.29.32.0/20]; MV_CASE(0.50)[]; MIME_GOOD(-0.10)[text/plain]; MIME_TRACE(0.00)[0:+]; DMARC_NA(0.00)[punkt.de]; RCVD_COUNT_THREE(0.00)[3]; TO_MATCH_ENVRCPT_SOME(0.00)[]; MX_GOOD(-0.01)[mailin.pluspunkthosting.de,mailin.pluspunkthosting.de]; RCPT_COUNT_TWO(0.00)[2]; RCVD_IN_DNSWL_NONE(0.00)[131.33.29.217.list.dnswl.org : 127.0.10.0]; NEURAL_HAM_SHORT(-0.90)[-0.897,0]; RCVD_TLS_LAST(0.00)[]; FROM_EQ_ENVFROM(0.00)[]; R_DKIM_NA(0.00)[]; SUBJECT_ENDS_QUESTION(1.00)[]; ASN(0.00)[asn:16188, ipnet:217.29.32.0/20, country:DE]; MID_RHS_MATCH_FROM(0.00)[]; IP_SCORE(-0.23)[ip: (-0.22), ipnet: 217.29.32.0/20(-0.52), asn: 16188(-0.42), country: DE(-0.01)] 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, 31 Jul 2019 12:46:31 -0000 Hi! > Am 31.07.2019 um 14:07 schrieb Viktor Dukhovni : > Since a bunch of my traffic is SMTP, I need reverse resolution for > outgoing IPv6, which means that I need the outgoing sources address > to be ::1, not ::2, even though the > routing table lists "gif0" as the interface with the default route. >=20 > Is it possible to configure my system to use the internal /64 address > as the default source address of outgoing IPv6 packets? That is probably pretty easy depending on your preferred mail server. Make your mail server listen to ::1 only instead of :: It will then automatically accept connections on that address and use it for outbound, too, because it does not have a choice. Add IP4c and loopback of course. E.g. for Sendmail: = https://www.computing.net/answers/linux/sendmail-bind-to-ip-address/31045.= html HTH, Patrick --=20 punkt.de GmbH Internet - Dienstleistungen - Beratung Kaiserallee 13a Tel.: 0721 9109-0 Fax: -100 76133 Karlsruhe info@punkt.de http://punkt.de AG Mannheim 108285 Gf: Juergen Egeling