Date: Wed, 18 Dec 2019 12:47:14 +0100 From: Axel Rau <Axel.Rau@chaos1.de> To: net@FreeBSD.ORG Subject: [RESOLVED] --was: Re: TCP 3-way-handshake fails Message-ID: <6BBBA26D-10CD-41AE-806E-818FC8E884DE@Chaos1.DE> In-Reply-To: <12A16AC0-651B-4CAC-814A-FD5A8FF68D2F@Chaos1.DE> References: <12A16AC0-651B-4CAC-814A-FD5A8FF68D2F@Chaos1.DE>
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--Apple-Mail=_4508E5B3-4F4C-4B7F-AB92-AEB5C38F15ED Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=utf-8 After router startup, its routingtable shows entries like this: 2a05:bec0:26:2::70 0c:c4:7a:ce:9e:90 UHLc 2a05:bec0:26:2::71 link#1 UHLc The 2nd one is an alias address for the 1st one (a jail). After ping6 from the router to this 2nd address, it looks as expected: fw1# ping6 2a05:bec0:26:2::71 2a05:bec0:26:2::70 0c:c4:7a:ce:9e:90 UHLc 2a05:bec0:26:2::71 0c:c4:7a:ce:9e:90 UHLc The reason for this misbehaviour was that I disabled auto linklocal (-auto_linklocal in rc.conf). Axel > Am 10.12.2019 um 11:40 schrieb Axel Rau <Axel.Rau@chaos1.de>: >=20 > Hi all >=20 > I have a fancy behaviour on a FreeBSD 12.1 box, with > some servers (e.g. rsyslogd, nginx) which happens with > some clients, with others not (both are in the same sub- > nets). Everything is dualstack. Disabling IPv6, stops > the problem. > The traffic is routed via 2 firewalls OpenBSD 6.6) > and a VPN. >=20 > I attach 2 textfiles (tcpdump) with an extracted flow: >=20 > gw1, the OpenBSD side > db3: the FreeBSD side >=20 > I also include an example, where the problem > does not happen: db3,ok.txt >=20 > Which details needs to be collected to insulate > the problem? >=20 > Any help is very welcome, > Axel >=20 > <gw1.32404.txt><db3.32404.txt><db3.ok.txt> > --- > PGP-Key: CDE74120 =E2=98=80 computing @ chaos claudius >=20 --- PGP-Key: CDE74120 =E2=98=80 computing @ chaos claudius --Apple-Mail=_4508E5B3-4F4C-4B7F-AB92-AEB5C38F15ED Content-Transfer-Encoding: 7bit Content-Disposition: attachment; filename=signature.asc Content-Type: application/pgp-signature; name=signature.asc Content-Description: Message signed with OpenPGP -----BEGIN PGP SIGNATURE----- Version: GnuPG/MacGPG2 v2.2 Comment: GPGTools - http://gpgtools.org iQIzBAEBCAAdFiEEl5evOTfnjZdhkBzKaPxTRM3nQSAFAl36EcIACgkQaPxTRM3n QSDlBw//S+PTrp4cHlzmCUv7Ov4EgiudUhZA43K14g7+EIeuZo21SNkzOwdMjCGG x5ueTwDRRgMaVRGQeckLKVHfiFiwj0vmjH5QPpZUgk7SGXShssXUGkVs+s0P6OZQ MLbdzfAi6KxocALaJ5mo2+r9QZK7h6ISqnIkwFpKqruTdERuhP5j4Q1oI28OYv22 Le0LQn1NLfh8Fu+fMPKGOygCxNi+4ogkEcvq7aX/41Zk4rKqEMxrusQr/F3l8Dds bZ4sdnXTiuHPAZtYSGAEQ4IPvCF110LmT93Ib74xkZC9G7AUxUnyFbSr8WA+Lvr/ KNJGL0zwxoSvbq8Pj2JxLPFan44W22WnTQzNXeHecSlssvIiubsih7OwPh1SrZwB IBfC355C18Fp6KeQxqxG5bNPgPAPNjvto6181AIju0Pj8gC4/xxIQ/Yg9+JKr6eL /ov75AaLsWj/g+glI/o3+nvSxChOvAS7kmdJZSJd+pzCwAl4gDaLHf9uaEMSH5rP CYePPFMTdHVbTW7yTvLWbscV6FzhkpVDuR/dS77vIAh7VAWwRziDpbpRVwqTyBYT XPwgbHm+IMJa3qybCw10H/y4H+5TkaBmt+HU2VakiejMTNduAQAx7ewGxJGQIofL KyJmmMV+N+tfV/JXcRdk0P9yPjrhijsNlMcYjodcvKie6XUis18= =wm9U -----END PGP SIGNATURE----- --Apple-Mail=_4508E5B3-4F4C-4B7F-AB92-AEB5C38F15ED--
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