From owner-freebsd-doc@freebsd.org Mon Dec 3 17:29:55 2018 Return-Path: Delivered-To: freebsd-doc@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 D7E76132D68E for ; Mon, 3 Dec 2018 17:29:54 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from mailman.ysv.freebsd.org (mailman.ysv.freebsd.org [IPv6:2001:1900:2254:206a::50:5]) by mx1.freebsd.org (Postfix) with ESMTP id 4F26C8B7DE for ; Mon, 3 Dec 2018 17:29:54 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: by mailman.ysv.freebsd.org (Postfix) id 12A8D132D68C; Mon, 3 Dec 2018 17:29:54 +0000 (UTC) Delivered-To: doc@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 E4567132D68B for ; Mon, 3 Dec 2018 17:29:53 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from mxrelay.ysv.freebsd.org (mxrelay.ysv.freebsd.org [IPv6:2001:1900:2254:206a::19:3]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) (Client CN "mxrelay.ysv.freebsd.org", Issuer "Let's Encrypt Authority X3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 8344D8B7DC for ; Mon, 3 Dec 2018 17:29:53 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org (kenobi.freebsd.org [IPv6:2001:1900:2254:206a::16:76]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mxrelay.ysv.freebsd.org (Postfix) with ESMTPS id 9E2CA16A9C for ; Mon, 3 Dec 2018 17:29:52 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org ([127.0.1.118]) by kenobi.freebsd.org (8.15.2/8.15.2) with ESMTP id wB3HTqVP062631 for ; Mon, 3 Dec 2018 17:29:52 GMT (envelope-from bugzilla-noreply@freebsd.org) Received: (from www@localhost) by kenobi.freebsd.org (8.15.2/8.15.2/Submit) id wB3HTqFD062630 for doc@FreeBSD.org; Mon, 3 Dec 2018 17:29:52 GMT (envelope-from bugzilla-noreply@freebsd.org) X-Authentication-Warning: kenobi.freebsd.org: www set sender to bugzilla-noreply@freebsd.org using -f From: bugzilla-noreply@freebsd.org To: doc@FreeBSD.org Subject: [Bug 233754] Router Advertisement configuration and prefixlen Date: Mon, 03 Dec 2018 17:29:52 +0000 X-Bugzilla-Reason: AssignedTo X-Bugzilla-Type: new X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: Documentation X-Bugzilla-Component: Documentation X-Bugzilla-Version: Latest X-Bugzilla-Keywords: X-Bugzilla-Severity: Affects Only Me X-Bugzilla-Who: lapo@lapo.it X-Bugzilla-Status: New X-Bugzilla-Resolution: X-Bugzilla-Priority: --- X-Bugzilla-Assigned-To: doc@FreeBSD.org X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: bug_id short_desc product version rep_platform op_sys bug_status bug_severity priority component assigned_to reporter Message-ID: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: https://bugs.freebsd.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 X-Rspamd-Queue-Id: 4F26C8B7DE X-Spamd-Result: default: False [0.51 / 15.00]; local_wl_from(0.00)[freebsd.org]; NEURAL_HAM_MEDIUM(-0.04)[-0.035,0]; NEURAL_SPAM_LONG(0.01)[0.010,0]; ASN(0.00)[asn:10310, ipnet:2001:1900:2254::/48, country:US]; NEURAL_SPAM_SHORT(0.54)[0.536,0] X-Rspamd-Server: mx1.freebsd.org X-BeenThere: freebsd-doc@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Documentation project List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 03 Dec 2018 17:29:55 -0000 https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D233754 Bug ID: 233754 Summary: Router Advertisement configuration and prefixlen Product: Documentation Version: Latest Hardware: Any OS: Any Status: New Severity: Affects Only Me Priority: --- Component: Documentation Assignee: doc@FreeBSD.org Reporter: lapo@lapo.it Hi, while trying to debug a SLAAC configuration problem of mine, I noticed something strange in the documentation: https://www.freebsd.org/doc/handbook/network-ipv6.html chapter 31.9.4 states: Next, create the configuration file, /etc/rtadvd.conf as seen in this example: [=E2=80=A6] For a dedicated /64 subnet, nothing else needs to be changed. Otherwise, change the prefixlen# to the correct value. while `man rtadvd.conf` states: As described in rtadvd(8), you do not have to set this configuration f= ile up at all, unless you need some special configurations. You may even omit the file as a whole. In such cases, the rtadvd daemon will automatically configure itself using default values specified in the specification. and indeed, I checked with Wireshark and it is broadcasting the correct pre= fix length (in my case, /80) with no need to have created that file. Then my problem is that prefixlen =E2=89=A0 64 cannot be used by accept_rta= dv or, at least, it is what I understand from RTFS nd6_rts.c line 1495, which reads: if (ifidlen + pr->ndpr_plen !=3D 128) (and ifidlen is always 64, as returned by in6_if2idlen()) I'm not sure what's the best solution for the Handbook, but I'd probably re= move the `rtadv.conf` example altogether, as it gives no advantage and only the = risk of writing it wrong; also, as far as `rtadvd` goes, any prefix length is fi= ne, but then any FreeBSD client won't accept it anyways, so I'm not so sure suggesting what to do "when prefixlen is different" is very useful=E2=80=A6= a warning about the lack of SLAAC for any other prefixlen could be useful, for people= who don't know it already. --=20 You are receiving this mail because: You are the assignee for the bug.=