From owner-freebsd-net@freebsd.org Sun Dec 15 10:46:48 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 613891E93AB for ; Sun, 15 Dec 2019 10:46:48 +0000 (UTC) (envelope-from bu7cher@yandex.ru) Received: from forward106j.mail.yandex.net (forward106j.mail.yandex.net [5.45.198.249]) (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 47bLgV6B3Jz4Ps0 for ; Sun, 15 Dec 2019 10:46:46 +0000 (UTC) (envelope-from bu7cher@yandex.ru) Received: from mxback1o.mail.yandex.net (mxback1o.mail.yandex.net [IPv6:2a02:6b8:0:1a2d::1b]) by forward106j.mail.yandex.net (Yandex) with ESMTP id 0FEA111A11F6; Sun, 15 Dec 2019 13:46:44 +0300 (MSK) Received: from sas1-e00c2743cdb8.qloud-c.yandex.net (sas1-e00c2743cdb8.qloud-c.yandex.net [2a02:6b8:c14:3a22:0:640:e00c:2743]) by mxback1o.mail.yandex.net (mxback/Yandex) with ESMTP id 16YkFkw7wM-khGqmado; Sun, 15 Dec 2019 13:46:44 +0300 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yandex.ru; s=mail; t=1576406804; bh=tJ5dYjaok1egZhhyoTzrWVQRz9vxmgOC8QV9f2GDz6E=; h=In-Reply-To:From:Date:References:To:Subject:Message-ID; b=Jdu4iOZ8pLG6Xc3Hq2yRWtmQifgOAKfGlmt21i+MItLC8w4vLhi5ak/AMS566pUi6 3QzPiJ1sc062SFy+Ocs4kVEY9dSFs96qPvDIPocNHYP+ny4ngXzcEcbBpW5hpigWfl aVHukLYT0cDzshRY2uzaIbdlZCPZ1Ak0Lq7xKY9U= Received: by sas1-e00c2743cdb8.qloud-c.yandex.net (smtp/Yandex) with ESMTPSA id nOrIX08COC-khTGKbrH; Sun, 15 Dec 2019 13:46:43 +0300 (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) (Client certificate not present) Subject: Re: NAT64 return traffic vanishes after successful de-alias To: "John W. O'Brien" , FreeBSD Networking References: <9f3ee846-1357-0b73-cc0f-e001ea74b15c@saltant.com> From: "Andrey V. Elsukov" Openpgp: id=E6591E1B41DA1516F0C9BC0001C5EA0410C8A17A Autocrypt: addr=bu7cher@yandex.ru; prefer-encrypt=mutual; keydata= mQENBEwBF1kBCADB9sXFhBEUy8qQ4X63Y8eBatYMHGEFWN9ypS5lI3RE6qQW2EYbxNk7qUC5 21YIIS1mMFVBEfvR7J9uc7yaYgFCEb6Sce1RSO4ULN2mRKGHP3/Sl0ijZEjWHV91hY1YTHEF ZW/0GYinDf56sYpDDehaBF5wkWIo1+QK5nmj3vl0DIDCMNd7QEiWpyLVwECgLX2eOAXByT8B bCqVhJGcG6iFP7/B9Ll6uX5gb8thM9LM+ibwErDBVDGiOgvfxqidab7fdkh893IBCXa82H9N CNwnEtcgzh+BSKK5BgvPohFMgRwjti37TSxwLu63QejRGbZWSz3OK3jMOoF63tCgn7FvABEB AAG0JUFuZHJleSBWLiBFbHN1a292IDxidTdjaGVyQHlhbmRleC5ydT6JATgEEwECACIFAkwB F1kCGwMGCwkIBwMCBhUIAgkKCwQWAgMBAh4BAheAAAoJEAHF6gQQyKF6qmYIAI6ekfm1VA4T vqankI1ISE6ku4jV7UlpIQlEbE7/8n3Zd6teJ+pGOQhN5qk8QE7utdPdbktAzi+x7LIJVzUw 4TywZLXGrkP7VKYkfg6oyCGyzITghefQeJtr2TN4hYCkzPWpylkue8MtmqfZv/6royqwTbN+ +E09FQNvTgRUYJYTeQ1qOsxNRycwvw3dr2rOfuxShbzaHBB1pBIjGrMg8fC5pd65ACH5zuFV A0CoTNGMDrEZSfBkTW604UUHFFXeCoC3dwDZRKOWJ3GmMXns65Ai5YkA63BSHEE1Qle3VBhd cG1w0CB5FBV3pB27UVnf0jEbysrDqW4qN7XMRFSWNAy5AQ0ETAEXWQEIAJ2p6l9LBoqdH/0J PEFDY2t2gTvAuzz+8zs3R03dFuHcNbOwjvWCG0aOmVpAzkRa8egn5JB4sZaFUtKPYJEQ1Iu+ LUBwgvtXf4vWpzC67zs2dDuiW4LamH5p6xkTD61aHR7mCB3bg2TUjrDWn2Jt44cvoYxj3dz4 S49U1rc9ZPgD5axCNv45j72tggWlZvpefThP7xT1OlNTUqye2gAwQravXpZkl5JG4eOqJVIU X316iE3qso0iXRUtO7OseBf0PiVmk+wCahdreHOeOxK5jMhYkPKVn7z1sZiB7W2H2TojbmcK HZC22sz7Z/H36Lhg1+/RCnGzdEcjGc8oFHXHCxUAEQEAAYkBHwQYAQIACQUCTAEXWQIbDAAK CRABxeoEEMihegkYCAC3ivGYNe2taNm/4Nx5GPdzuaAJGKWksV+w9mo7dQvU+NmI2az5w8vw 98OmX7G0OV9snxMW+6cyNqBrVFTu33VVNzz9pnqNCHxGvj5dL5ltP160JV2zw2bUwJBYsgYQ WfyJJIM7l3gv5ZS3DGqaGIm9gOK1ANxfrR5PgPzvI9VxDhlr2juEVMZYAqPLEJe+SSxbwLoz BcFCNdDAyXcaAzXsx/E02YWm1hIWNRxanAe7Vlg7OL+gvLpdtrYCMg28PNqKNyrQ87LQ49O9 50IIZDOtNFeR0FGucjcLPdS9PiEqCoH7/waJxWp6ydJ+g4OYRBYNM0EmMgy1N85JJrV1mi5i Message-ID: <52463470-973e-aa5f-73f5-dd9ba39edf79@yandex.ru> Date: Sun, 15 Dec 2019 13:44:04 +0300 User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0 MIME-Version: 1.0 In-Reply-To: <9f3ee846-1357-0b73-cc0f-e001ea74b15c@saltant.com> Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="tTIAUWYK7MpBr2IY9LJbgeylmbfFE50kq" X-Rspamd-Queue-Id: 47bLgV6B3Jz4Ps0 X-Spamd-Bar: ------ Authentication-Results: mx1.freebsd.org; dkim=pass header.d=yandex.ru header.s=mail header.b=Jdu4iOZ8; dmarc=pass (policy=none) header.from=yandex.ru; spf=pass (mx1.freebsd.org: domain of bu7cher@yandex.ru designates 5.45.198.249 as permitted sender) smtp.mailfrom=bu7cher@yandex.ru X-Spamd-Result: default: False [-6.20 / 15.00]; R_SPF_ALLOW(-0.20)[+ip4:5.45.192.0/19]; FREEMAIL_FROM(0.00)[yandex.ru]; HAS_ATTACHMENT(0.00)[]; RCVD_COUNT_THREE(0.00)[3]; TO_DN_ALL(0.00)[]; DKIM_TRACE(0.00)[yandex.ru:+]; RCPT_COUNT_TWO(0.00)[2]; DMARC_POLICY_ALLOW(-0.50)[yandex.ru,none]; SIGNED_PGP(-2.00)[]; FROM_EQ_ENVFROM(0.00)[]; IP_SCORE(0.00)[ip: (-9.67), ipnet: 5.45.192.0/18(-4.80), asn: 13238(-3.78), country: RU(0.01)]; RCVD_TLS_LAST(0.00)[]; RCVD_IN_DNSWL_LOW(-0.10)[249.198.45.5.list.dnswl.org : 127.0.5.1]; ASN(0.00)[asn:13238, ipnet:5.45.192.0/18, country:RU]; MID_RHS_MATCH_FROM(0.00)[]; ARC_NA(0.00)[]; NEURAL_HAM_MEDIUM(-1.00)[-1.000,0]; R_DKIM_ALLOW(-0.20)[yandex.ru:s=mail]; FROM_HAS_DN(0.00)[]; FREEMAIL_ENVFROM(0.00)[yandex.ru]; NEURAL_HAM_LONG(-1.00)[-1.000,0]; MIME_GOOD(-0.20)[multipart/signed,multipart/mixed,text/plain]; MIME_TRACE(0.00)[0:+,1:+,2:+,3:~]; IP_SCORE_FREEMAIL(0.00)[]; DWL_DNSWL_LOW(-1.00)[yandex.ru.dwl.dnswl.org : 127.0.5.1]; TO_MATCH_ENVRCPT_SOME(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: Sun, 15 Dec 2019 10:46:48 -0000 This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --tTIAUWYK7MpBr2IY9LJbgeylmbfFE50kq Content-Type: multipart/mixed; boundary="lEm04Vdv3ByYslfGqv7gTEtUbBadc1Fqq"; protected-headers="v1" From: "Andrey V. Elsukov" To: "John W. O'Brien" , FreeBSD Networking Message-ID: <52463470-973e-aa5f-73f5-dd9ba39edf79@yandex.ru> Subject: Re: NAT64 return traffic vanishes after successful de-alias References: <9f3ee846-1357-0b73-cc0f-e001ea74b15c@saltant.com> In-Reply-To: <9f3ee846-1357-0b73-cc0f-e001ea74b15c@saltant.com> --lEm04Vdv3ByYslfGqv7gTEtUbBadc1Fqq Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: quoted-printable On 14.12.2019 22:54, John W. O'Brien wrote: > Hello FreeBSD Networking, >=20 > As the subject summarizes, I have a mostly-working NAT64 rig, but retur= n > traffic is disappearing, and I haven't been able to figure out why. I > observe the post-translation (4-to-6) packets via ipfwlog0, but a simpl= e > ipfw counter rule ipfw matches nothing. I suspect you have disabled IPv6 on the interface, where IPv4 address is configured. Check that IFDISABLED flag is not set on the IPv4 side interface. When NAT64 does translation, by default it reschedules a packet again on the same interface, but from another address family, so if you have disabled IPv6, a packet will be just dropped by ip6_input. You can enable IPv6 by the following command: # ifconfig igb0 inet6 -ifdisabled --=20 WBR, Andrey V. 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