Date: Wed, 19 Jul 2017 16:35:45 +0300 From: "Andrey V. Elsukov" <bu7cher@yandex.ru> To: "Muenz, Michael" <m.muenz@spam-fetish.org>, freebsd-net@freebsd.org Subject: Re: NAT before IPSEC - reply packets stuck at enc0 Message-ID: <15e6eb38-ef0c-7bfd-5f2c-d2acc8ea1af4@yandex.ru> In-Reply-To: <1279753e-9ad1-2c02-304e-5001e2bbc82f@spam-fetish.org> References: <459d59f7-2895-8aed-d547-be46a0fbb918@spam-fetish.org> <a082662c-145e-0132-18ef-083adaa59c33@yandex.ru> <1c0de616-91ff-a6f9-d946-f098bc1a709f@spam-fetish.org> <911903d1-f353-d5d6-d400-d86150f88136@yandex.ru> <2d607e1a-a2c0-0f85-1530-c478962a76cd@spam-fetish.org> <3344e189-cdf0-a2c9-3a2a-645460866f2d@yandex.ru> <1279753e-9ad1-2c02-304e-5001e2bbc82f@spam-fetish.org>
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This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --I16qIIKMIn6oDPRImqGQAU6hsSKg1O7GG Content-Type: multipart/mixed; boundary="3ivEsMHnttj1hfKnEv9fdj6FVl0EeGhsk"; protected-headers="v1" From: "Andrey V. Elsukov" <bu7cher@yandex.ru> To: "Muenz, Michael" <m.muenz@spam-fetish.org>, freebsd-net@freebsd.org Message-ID: <15e6eb38-ef0c-7bfd-5f2c-d2acc8ea1af4@yandex.ru> Subject: Re: NAT before IPSEC - reply packets stuck at enc0 References: <459d59f7-2895-8aed-d547-be46a0fbb918@spam-fetish.org> <a082662c-145e-0132-18ef-083adaa59c33@yandex.ru> <1c0de616-91ff-a6f9-d946-f098bc1a709f@spam-fetish.org> <911903d1-f353-d5d6-d400-d86150f88136@yandex.ru> <2d607e1a-a2c0-0f85-1530-c478962a76cd@spam-fetish.org> <3344e189-cdf0-a2c9-3a2a-645460866f2d@yandex.ru> <1279753e-9ad1-2c02-304e-5001e2bbc82f@spam-fetish.org> In-Reply-To: <1279753e-9ad1-2c02-304e-5001e2bbc82f@spam-fetish.org> --3ivEsMHnttj1hfKnEv9fdj6FVl0EeGhsk Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: quoted-printable On 19.07.2017 15:46, Muenz, Michael wrote: > Am 19.07.2017 um 14:22 schrieb Andrey V. Elsukov: >> >> Different NAT instances will not work for the same flow, because they >> have different state tables. Packets in both direction should pass >> trough the same NAT instance. >> >> What you see in tcpdump on the enc0 interface? >> > Ok, also tried with one nat instance, same result: >=20 > ipfw nat 1 config ip 10.26.1.1 log reverse > ipfw add 179 nat 1 log all from 10.26.2.0/24 to 10.24.66.0/24 > ipfw add 179 nat 1 log all from 10.24.66.0/24 to 10.26.1.1 in recv enc0= >=20 > LAN Interface: > 14:40:32.441506 IP 10.26.2.11 > 10.24.66.25: ICMP echo request, id > 45314, seq 256, length 8 > 14:40:33.441565 IP 10.26.2.11 > 10.24.66.25: ICMP echo request, id > 45314, seq 512, length 8 > 14:40:34.441635 IP 10.26.2.11 > 10.24.66.25: ICMP echo request, id > 45314, seq 768, length 8 >=20 > enc0 interface > 14:40:32.441553 (authentic,confidential): SPI 0x8fe95b44: IP 10.26.1.1 = > > 10.24.66.25: ICMP echo request, id 64122, seq 256, length 8 > 14:40:32.449671 (authentic,confidential): SPI 0xcbc867ea: IP 10.24.66.2= 5 >> 10.26.1.1: ICMP echo reply, id 64122, seq 256, length 8 > 14:40:33.441613 (authentic,confidential): SPI 0x8fe95b44: IP 10.26.1.1 = > > 10.24.66.25: ICMP echo request, id 64122, seq 512, length 8 > 14:40:33.450623 (authentic,confidential): SPI 0xcbc867ea: IP 10.24.66.2= 5 >> 10.26.1.1: ICMP echo reply, id 64122, seq 512, length 8 > 14:40:34.441683 (authentic,confidential): SPI 0x8fe95b44: IP 10.26.1.1 = > > 10.24.66.25: ICMP echo request, id 64122, seq 768, length 8 > 14:40:34.449786 (authentic,confidential): SPI 0xcbc867ea: IP 10.24.66.2= 5 >> 10.26.1.1: ICMP echo reply, id 64122, seq 768, length 8 Check what you will see if you set net.enc.in.ipsec_bpf_mask=3D3. You should see the reply two times, the second one should be with translated address. --=20 WBR, Andrey V. Elsukov --3ivEsMHnttj1hfKnEv9fdj6FVl0EeGhsk-- --I16qIIKMIn6oDPRImqGQAU6hsSKg1O7GG 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/ iQEzBAEBCAAdFiEE5lkeG0HaFRbwybwAAcXqBBDIoXoFAllvYDEACgkQAcXqBBDI oXq+tQf7Bw28qDdUnrSGqEo1aJqyXh66v3jUj1KIQRneeDRKNlouMK+p4eNTdqQy QjmXZekRiHKEVoyBIuvXFIBakN8XmGjAy591zPRciu+cnyAtub9B4u7+NFUUkEWE LS+szgnebxqrhcjRwuxVznFykDmcXUo4/BNFc32jPAad5twyUOAZ3fe/rrMpzhkf tPhU1KdhUZF6biSefFmtch8OdvzLiXGQxZZbLDMbxCk6tmYsIrX+YpxPxr5jOUjl NymB80oM2rj4TZTM9kEf8YAwoU1kZwGrAjm+HDYyfNI3Ic9u+fN3dGFBCr7nn+Yg KtzrlxGpBg/9gK4qfT3bYvnbwQuaMQ== =cXo5 -----END PGP SIGNATURE----- --I16qIIKMIn6oDPRImqGQAU6hsSKg1O7GG--
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