Date: Mon, 1 Nov 2021 14:44:50 +0300 From: "Andrey V. Elsukov" <bu7cher@yandex.ru> To: Peter <pmc@citylink.dinoex.sub.org>, freebsd-stable@freebsd.org Subject: Re: IPv6 inflight fragmentation Message-ID: <4053ee14-de6a-7f20-1d15-bb6ddb3c4d66@yandex.ru> In-Reply-To: <YX3%2BWa0xSKeZWGLz@gate.intra.daemon.contact> References: <YX3%2BWa0xSKeZWGLz@gate.intra.daemon.contact>
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This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --jvIb5ndFvgvZnNep3W0cG3chYCX0hFt1S Content-Type: multipart/mixed; boundary="ggR69GAB6t79jZHKAXhuslwZglMYR3Wcd"; protected-headers="v1" From: "Andrey V. Elsukov" <bu7cher@yandex.ru> To: Peter <pmc@citylink.dinoex.sub.org>, freebsd-stable@freebsd.org Message-ID: <4053ee14-de6a-7f20-1d15-bb6ddb3c4d66@yandex.ru> Subject: Re: IPv6 inflight fragmentation References: <YX3+Wa0xSKeZWGLz@gate.intra.daemon.contact> In-Reply-To: <YX3+Wa0xSKeZWGLz@gate.intra.daemon.contact> --ggR69GAB6t79jZHKAXhuslwZglMYR3Wcd Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: quoted-printable 31.10.2021 05:24, Peter =D0=BF=D0=B8=D1=88=D0=B5=D1=82: > From what I understood, inflight fragmentation (on an intermediate rout= er) > is not practical with IPv6. But it happens: > And it doesn't seem like these packets would be answered at all. >=20 > This happens when there is a dummynet pipe/queue rule (or a divert > rule) in the outbound rules to an interface that must reduce the MTU. > As soon as we skip over that dummynet (or divert), we get these ICMPv6 > messages at the other end, and the fragmentation ceases: Hi, divert rule does implicit IP fragments reassembling before passing a packet to application. I don't think dummynet is affected by this. --=20 WBR, Andrey V. Elsukov --ggR69GAB6t79jZHKAXhuslwZglMYR3Wcd-- --jvIb5ndFvgvZnNep3W0cG3chYCX0hFt1S Content-Type: application/pgp-signature; name="OpenPGP_signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="OpenPGP_signature" -----BEGIN PGP SIGNATURE----- wsB5BAABCAAjFiEE5lkeG0HaFRbwybwAAcXqBBDIoXoFAmF/0zMFAwAAAAAACgkQAcXqBBDIoXqt DQf7B/sV9F5vUbjH/lIg2oefRw28uoaJhhEyPiL2W/u6sDKskVTTlwWbYu8ff7Oh0KpLxykVaO38 gHsqXAFbEDvJ32dR8jThvLQj/Z60/UFx9CH90tn9+HWChBHUNCLwjYiJ9uokvNCh6/F8eu9ZKBXy hSCM1suqNe8BVzGNc7GJTrixnPHx12CTab+rFNJylKGlJzHO44ZymrA0s0IZGbM1zOUpOmT3FVKG Fxhwcn4Te9AV1EiMDvu4NDIz9QFpp6SNM9TQnm5L9mAOlX5PX4hIrcUqETjE1PoagnRbW6MMM5uc +yq5yi5P3yfM5OY7D58XKGTYK2ebBn43moD38x46Sw== =SLpi -----END PGP SIGNATURE----- --jvIb5ndFvgvZnNep3W0cG3chYCX0hFt1S--
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