From owner-freebsd-net@freebsd.org Fri Jun 22 17:44:18 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 B5BFA1022522 for ; Fri, 22 Jun 2018 17:44:18 +0000 (UTC) (envelope-from bu7cher@yandex.ru) Received: from forward106j.mail.yandex.net (forward106j.mail.yandex.net [IPv6:2a02:6b8:0:801:2::109]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "forwards.mail.yandex.net", Issuer "Yandex CA" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 26ABB79354 for ; Fri, 22 Jun 2018 17:44:17 +0000 (UTC) (envelope-from bu7cher@yandex.ru) Received: from mxback7g.mail.yandex.net (mxback7g.mail.yandex.net [IPv6:2a02:6b8:0:1472:2741:0:8b7:168]) by forward106j.mail.yandex.net (Yandex) with ESMTP id B5A031806936; Fri, 22 Jun 2018 20:44:14 +0300 (MSK) Received: from smtp3o.mail.yandex.net (smtp3o.mail.yandex.net [2a02:6b8:0:1a2d::27]) by mxback7g.mail.yandex.net (nwsmtp/Yandex) with ESMTP id 5xeSIfUpZJ-iEmeYRIJ; Fri, 22 Jun 2018 20:44:14 +0300 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yandex.ru; s=mail; t=1529689454; bh=qeu0zve0u8o54CgTq/3Jio+cEq0ccTCwsu6tKt1FiIY=; h=Subject:To:References:From:Message-ID:Date:In-Reply-To; b=KCQcn1MVj/FeQKfLd6wO857p1KuvZwQXHoG90RmM7GYt5CIwefMo2NsbBgS/I9wVt PvPNAGoDWPrRPiZqlC8DKkxwmfOKxBAkDPw+K6BRF5RHOozceMPkJ4kX9a4jyP0MOp xcVBTBo4B0RMY+gd06Kq49YPg761VdVCpqR7gZAU= Received: by smtp3o.mail.yandex.net (nwsmtp/Yandex) with ESMTPSA id 6LbzqOyeT7-iDGqFDR2; Fri, 22 Jun 2018 20:44:13 +0300 (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (Client certificate not present) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yandex.ru; s=mail; t=1529689453; bh=qeu0zve0u8o54CgTq/3Jio+cEq0ccTCwsu6tKt1FiIY=; h=Subject:To:References:From:Message-ID:Date:In-Reply-To; b=SL+ODxG0O6Ulorj7bIej0virfBPztwx5aF9brQUcDgC/xJlzuQhIjC6DOo37uYuLU rHl3xgWnQSv6SSdV7+FI02972hK/v/WEyOP/PSdYLqVbUl6QmVfuiWq01HNkKxJUIP ynayPzBb6YffO9kLBsh4VcF8bH5foZU934DoY/I0= Authentication-Results: smtp3o.mail.yandex.net; dkim=pass header.i=@yandex.ru Subject: Re: [PATCH]: The 6to4 stf0 interface flapping in/out of tentative in FreeBSD 11 To: freebsd-net@freebsd.org, Viktor Dukhovni References: <20171106042248.GL3322@mournblade.imrryr.org> <20180622163812.GA17559@mournblade.imrryr.org> From: "Andrey V. Elsukov" Openpgp: id=E6591E1B41DA1516F0C9BC0001C5EA0410C8A17A Autocrypt: addr=bu7cher@yandex.ru; prefer-encrypt=mutual; keydata= xsBNBEwBF1kBCADB9sXFhBEUy8qQ4X63Y8eBatYMHGEFWN9ypS5lI3RE6qQW2EYbxNk7qUC5 21YIIS1mMFVBEfvR7J9uc7yaYgFCEb6Sce1RSO4ULN2mRKGHP3/Sl0ijZEjWHV91hY1YTHEF ZW/0GYinDf56sYpDDehaBF5wkWIo1+QK5nmj3vl0DIDCMNd7QEiWpyLVwECgLX2eOAXByT8B bCqVhJGcG6iFP7/B9Ll6uX5gb8thM9LM+ibwErDBVDGiOgvfxqidab7fdkh893IBCXa82H9N CNwnEtcgzh+BSKK5BgvPohFMgRwjti37TSxwLu63QejRGbZWSz3OK3jMOoF63tCgn7FvABEB AAHNIkFuZHJleSBWLiBFbHN1a292IDxhZUBmcmVlYnNkLm9yZz7CwHsEEwECACUCGwMGCwkI BwMCBhUIAgkKCwQWAgMBAh4BAheABQJMB/ruAhkBAAoJEAHF6gQQyKF6MLwH/3Ri/TZl9uo0 SepYWXOnxL6EaDVXDA+dLb1eLKC4PRBBjX29ttQ0KaWapiE6y5/AfzOPmRtHLrHYHjd/aiHX GMLHcYRXD+5GvdkK8iMALrZ28X0JXyuuZa8rAxWIWmCbYHNSBy2unqWgTI04Erodk90IALgM 9JeHN9sFqTM6zalrMnTzlcmel4kcjT3lyYw3vOKgoYLtsLhKZSbJoVVVlvRlGBpHFJI5AoYJ SyfXoN0rcX6k9X7Isp2K50YjqxV4v78xluh1puhwZyC0p8IShPrmrp9Oy9JkMX90o6UAXdGU KfdExJuGJfUZOFBTtNIMNIAKfMTjhpRhxONIr0emxxDOwE0ETAEXWQEIAJ2p6l9LBoqdH/0J PEFDY2t2gTvAuzz+8zs3R03dFuHcNbOwjvWCG0aOmVpAzkRa8egn5JB4sZaFUtKPYJEQ1Iu+ LUBwgvtXf4vWpzC67zs2dDuiW4LamH5p6xkTD61aHR7mCB3bg2TUjrDWn2Jt44cvoYxj3dz4 S49U1rc9ZPgD5axCNv45j72tggWlZvpefThP7xT1OlNTUqye2gAwQravXpZkl5JG4eOqJVIU X316iE3qso0iXRUtO7OseBf0PiVmk+wCahdreHOeOxK5jMhYkPKVn7z1sZiB7W2H2TojbmcK HZC22sz7Z/H36Lhg1+/RCnGzdEcjGc8oFHXHCxUAEQEAAcLAXwQYAQIACQUCTAEXWQIbDAAK CRABxeoEEMihegkYCAC3ivGYNe2taNm/4Nx5GPdzuaAJGKWksV+w9mo7dQvU+NmI2az5w8vw 98OmX7G0OV9snxMW+6cyNqBrVFTu33VVNzz9pnqNCHxGvj5dL5ltP160JV2zw2bUwJBYsgYQ WfyJJIM7l3gv5ZS3DGqaGIm9gOK1ANxfrR5PgPzvI9VxDhlr2juEVMZYAqPLEJe+SSxbwLoz BcFCNdDAyXcaAzXsx/E02YWm1hIWNRxanAe7Vlg7OL+gvLpdtrYCMg28PNqKNyrQ87LQ49O9 50IIZDOtNFeR0FGucjcLPdS9PiEqCoH7/waJxWp6ydJ+g4OYRBYNM0EmMgy1N85JJrV1mi5i Message-ID: <8fe71247-a9a4-e3cb-3e4a-03852307f080@yandex.ru> Date: Fri, 22 Jun 2018 20:41:10 +0300 User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:52.0) Gecko/20100101 Thunderbird/52.8.0 MIME-Version: 1.0 In-Reply-To: <20180622163812.GA17559@mournblade.imrryr.org> Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="a6m4mp8fd6l2BsvcaD7ytmIWQ4jB6CRRj" X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.26 Precedence: list List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 22 Jun 2018 17:44:19 -0000 This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --a6m4mp8fd6l2BsvcaD7ytmIWQ4jB6CRRj Content-Type: multipart/mixed; boundary="eXoUMBQP722Ii9Cog335T5jgeXwnCNlt3"; protected-headers="v1" From: "Andrey V. Elsukov" To: freebsd-net@freebsd.org, Viktor Dukhovni Message-ID: <8fe71247-a9a4-e3cb-3e4a-03852307f080@yandex.ru> Subject: Re: [PATCH]: The 6to4 stf0 interface flapping in/out of tentative in FreeBSD 11 References: <20171106042248.GL3322@mournblade.imrryr.org> <20180622163812.GA17559@mournblade.imrryr.org> In-Reply-To: <20180622163812.GA17559@mournblade.imrryr.org> --eXoUMBQP722Ii9Cog335T5jgeXwnCNlt3 Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: quoted-printable On 22.06.2018 19:38, Viktor Dukhovni wrote: > I just upgraded to 11.1-p10, forgetting I had patched my kernel, > and the stf0 interface flapping was back, with IPv6 connectivity > disappearing every other second or so (interface shows as "tentative" > and outgoing connections fail with "can't assign requested address"). >=20 > Appied the same patch and rebooted, and the problem is gone. Here's > the patch again: >=20 > Index: sys/net/if_stf.c > --- sys/net/if_stf.c (revision 333375) > +++ sys/net/if_stf.c (working copy) > @@ -722,6 +722,7 @@ > } > =20 > ifp->if_flags |=3D IFF_UP; > + ifp->if_drv_flags |=3D IFF_DRV_RUNNING; > break; > =20 > case SIOCADDMULTI: >=20 Hi, Your change looks reasonable due to IPv6 DAD procedure does check for presence of IFF_DRV_RUNNING flag. But actually it seems the right solution should be disabling DAD for if_stf(4) interface. IPv6 DAD requires that given interface should be multicast capable, but for if_stf(4) it is not true. Will it help if you use `ifconfig stf0 inet6 no_dad` before assigning IPv6 address? --=20 WBR, Andrey V. Elsukov --eXoUMBQP722Ii9Cog335T5jgeXwnCNlt3-- --a6m4mp8fd6l2BsvcaD7ytmIWQ4jB6CRRj Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ iQEzBAEBCAAdFiEE5lkeG0HaFRbwybwAAcXqBBDIoXoFAlstNLYACgkQAcXqBBDI oXqB/wf/R4Be3fttFm/bbCnQcS2ERuredVi2L5WW+zjoOsWCiYfRNYmJx5kdtZsh DFrZm/W77S2vbwgc8rrkOx5Pdikv/MIu81vTcZyjZwKxRNMOhbTxWmZ2aSoLE4J7 +Wlb/0WKBenC61BNq93qgXNafK6ZBeB3w7IAypFyzF5lV44+GHdvzmDZVMxd4wMc Uh6GbgvtXoxV4wxzSKoXeUPeLGF85LlTvQB+GnYTUqe5VUI6COdRa3R6a0hD43gF Y977xwmqnEOXY1e69iaa8Iqi9Ek/Mw1wb2qiu9pRd2jicDt7JrMqSS6NNWZt65XY Gf7Ss5qB9YCLUvbnEs/M3TyUKQ2OxQ== =OPL8 -----END PGP SIGNATURE----- --a6m4mp8fd6l2BsvcaD7ytmIWQ4jB6CRRj--