From owner-freebsd-net@freebsd.org Fri Feb 19 09:48:57 2021 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 35B1F542BBD for ; Fri, 19 Feb 2021 09:48:57 +0000 (UTC) (envelope-from michael.tuexen@lurchi.franken.de) Received: from mailman.nyi.freebsd.org (unknown [127.0.1.3]) by mx1.freebsd.org (Postfix) with ESMTP id 4DhmxN6XHwz3hf8 for ; Fri, 19 Feb 2021 09:48:56 +0000 (UTC) (envelope-from michael.tuexen@lurchi.franken.de) Received: by mailman.nyi.freebsd.org (Postfix) id DE491542B50; Fri, 19 Feb 2021 09:48:56 +0000 (UTC) Delivered-To: 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 DE10A5428EF for ; Fri, 19 Feb 2021 09:48:56 +0000 (UTC) (envelope-from michael.tuexen@lurchi.franken.de) Received: from drew.franken.de (drew.ipv6.franken.de [IPv6:2001:638:a02:a001:20e:cff:fe4a:feaa]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "*.franken.de", Issuer "Sectigo RSA Domain Validation Secure Server CA" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4DhmxN5Sxfz3hhL for ; Fri, 19 Feb 2021 09:48:56 +0000 (UTC) (envelope-from michael.tuexen@lurchi.franken.de) Received: from [IPv6:2a02:8109:1140:c3d:8067:d120:8a77:8bde] (unknown [IPv6:2a02:8109:1140:c3d:8067:d120:8a77:8bde]) (Authenticated sender: lurchi) by mail-n.franken.de (Postfix) with ESMTPSA id DC1607220CCE4; Fri, 19 Feb 2021 10:48:45 +0100 (CET) Content-Type: text/plain; charset=us-ascii Mime-Version: 1.0 (Mac OS X Mail 14.0 \(3654.60.0.2.21\)) Subject: Re: IPv6 Fragmentation From: Michael Tuexen In-Reply-To: Date: Fri, 19 Feb 2021 10:48:45 +0100 Cc: "net@freebsd.org" Content-Transfer-Encoding: quoted-printable Message-Id: <472A2B49-9BEC-4335-B6FB-AC4DAA0F0310@lurchi.franken.de> References: To: Doug Hardie X-Mailer: Apple Mail (2.3654.60.0.2.21) X-Spam-Status: No, score=-2.9 required=5.0 tests=ALL_TRUSTED,BAYES_00 autolearn=disabled version=3.4.1 X-Spam-Checker-Version: SpamAssassin 3.4.1 (2015-04-28) on mail-n.franken.de X-Rspamd-Queue-Id: 4DhmxN5Sxfz3hhL X-Spamd-Bar: ---- Authentication-Results: mx1.freebsd.org; none X-Spamd-Result: default: False [-4.00 / 15.00]; REPLY(-4.00)[] X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.34 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, 19 Feb 2021 09:48:57 -0000 > On 19. Feb 2021, at 03:29, Doug Hardie wrote: >=20 > I don't know if this is a feature or a bug. On FreeBSD 9, the = following ping worked: >=20 > ping6 -s 5000 -b 6000 fe80::213:72ff:fec3:180f%dc0 I don't have a dc0 interface, but using re0 at one side and bge at the = other, I get with FreeBSD CURRENT: tuexen@cirrus:~ % ping6 -s 5000 -b 6000 fe80::2e09:4dff:fe00:c00%re0 PING6(5048=3D40+8+5000 bytes) fe80::aaa1:59ff:fe0c:da92%re0 --> = fe80::2e09:4dff:fe00:c00%re0 5008 bytes from fe80::2e09:4dff:fe00:c00%re0, icmp_seq=3D0 hlim=3D255 = time=3D0.393 ms 5008 bytes from fe80::2e09:4dff:fe00:c00%re0, icmp_seq=3D1 hlim=3D255 = time=3D0.419 ms 5008 bytes from fe80::2e09:4dff:fe00:c00%re0, icmp_seq=3D2 hlim=3D255 = time=3D0.354 ms 5008 bytes from fe80::2e09:4dff:fe00:c00%re0, icmp_seq=3D3 hlim=3D255 = time=3D0.446 ms 5008 bytes from fe80::2e09:4dff:fe00:c00%re0, icmp_seq=3D4 hlim=3D255 = time=3D0.421 ms 5008 bytes from fe80::2e09:4dff:fe00:c00%re0, icmp_seq=3D5 hlim=3D255 = time=3D0.372 ms ^C --- fe80::2e09:4dff:fe00:c00%re0 ping6 statistics --- 6 packets transmitted, 6 packets received, 0.0% packet loss round-trip min/avg/max/std-dev =3D 0.354/0.401/0.446/0.031 ms Best regards Michael >=20 > It had to be stopped, but it returned the number of ping responses = received along with statistics. >=20 > With FreeBSD 12.2 and 13.0-BETA2, it returns 100% packet loss. = tcpdump shows that it properly fragments the data, sends it, the other = end receives it and sends back the ACKs. The ACKs are received, but = somehow ping doesn't find out that the packets were received. >=20 > Without the -s and -b arguments, it works and you get 100% packets = received. >=20 > -- Doug >=20 > _______________________________________________ > freebsd-net@freebsd.org mailing list > https://lists.freebsd.org/mailman/listinfo/freebsd-net > To unsubscribe, send any mail to "freebsd-net-unsubscribe@freebsd.org"