From owner-freebsd-net@freebsd.org Sun Sep 30 03:04:37 2018 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 0E05D10B2DEE for ; Sun, 30 Sep 2018 03:04:37 +0000 (UTC) (envelope-from asomers@gmail.com) Received: from mail-lf1-f41.google.com (mail-lf1-f41.google.com [209.85.167.41]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority G3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 8A48D71643 for ; Sun, 30 Sep 2018 03:04:36 +0000 (UTC) (envelope-from asomers@gmail.com) Received: by mail-lf1-f41.google.com with SMTP id v17-v6so7538320lfe.3 for ; Sat, 29 Sep 2018 20:04:36 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=oumSSh8rUO1xDJ0wW5ekF9uOzNQxCNdgdt1A4EIcvPQ=; b=YVu651IGam3glRTH1mwtUDwpG+j+4vBpEyqwfxuVyW4GeChH1uIyDk2C9+LGGyou5H SfAQjsYNN5WR4KkYYnbPwJU8A3+D4gjv7o9NXaINKrmfrnFTsHJTUja8iRj1rohoOtwF tI97W/9FeDmUtQQgvdLL/Jh1koo7PR4OlkIvMT6tNOu9giI7Gy/leS8N6nsRg4VEXRTs 95eZJoDHJThN9VipyjCPP4SsUIlHHnvaEIlJYPd+FeqqKhHsJ7UsypLNSxqK/olhd03I IXJmJ242Z9vJED5IvxEB4WypbqqV7puSZgnMLd/NzyRhfZDOH2MoiD+0T8cbOQNPT8G8 GcQA== X-Gm-Message-State: ABuFfoi8d/WCPxuNN5Kqp24SzdoN4GvwoNHTjRFREUS1B7Q+N07CVgyK MjdwzQCEUPXnfvTg1IcJL18JWtawK12IaG6FgUY= X-Google-Smtp-Source: ACcGV62VCVeq2lrk2svT2W6tQlMm7Rm+wbZNspKK2S4iXuXHNMLVRNEeixDJCnyN4OfgSLx/VOq4DHUBOwstUjHqf9s= X-Received: by 2002:a19:5e5d:: with SMTP id z29-v6mr2326830lfi.110.1538276282170; Sat, 29 Sep 2018 19:58:02 -0700 (PDT) MIME-Version: 1.0 References: <20180930022007.GA2041@admin.sibptus.ru> In-Reply-To: <20180930022007.GA2041@admin.sibptus.ru> From: Alan Somers Date: Sat, 29 Sep 2018 20:57:17 -0600 Message-ID: Subject: Re: why rtsold ? To: vas@mpeks.tomsk.su Cc: FreeBSD Net Content-Type: text/plain; charset="UTF-8" X-Content-Filtered-By: Mailman/MimeDel 2.1.27 X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.27 Precedence: list List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 30 Sep 2018 03:04:37 -0000 On Sat, Sep 29, 2018 at 8:20 PM Victor Sudakov wrote: > Dear Colleagues, > > When running FreeBSD as an IPv6 host im SLAAC mode, is > "rtsold_enable=YES" really necessary? I did not enable rtsold and IPv6 > still works fine only with > > fconfig_re0="" > ifconfig_re0_ipv6="inet6 accept_rtadv" > > What would be the point of enabling rtsold then? > > -- > Victor Sudakov, VAS4-RIPE, VAS47-RIPN > 2:5005/49@fidonet http://vas.tomsk.ru/ > The router may send a router advertisement whenever it wants. That's why your machine seems to work even without rtsold. However, SLAAC addresses expire after a certain amount of time. rtsold will ask the router for a new advertisement before your address expires. You aren't guaranteed to have problems if you don't run rtsold, but you aren't guaranteed not to have problems if you don't. Best to let it run. -Alan