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charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: netapp.com X-MS-Exchange-CrossTenant-Network-Message-Id: 50a64510-c4c6-486e-34a2-08d69979a46d X-MS-Exchange-CrossTenant-originalarrivaltime: 23 Feb 2019 10:28:24.6975 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 4b0911a0-929b-4715-944b-c03745165b3a X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-Transport-CrossTenantHeadersStamped: SN4PR0601MB3598 X-Rspamd-Queue-Id: CCF7C84D39 X-Spamd-Bar: ------ Authentication-Results: mx1.freebsd.org X-Spamd-Result: default: False [-6.97 / 15.00]; NEURAL_HAM_MEDIUM(-1.00)[-1.000,0]; NEURAL_HAM_LONG(-1.00)[-1.000,0]; REPLY(-4.00)[]; NEURAL_HAM_SHORT(-0.97)[-0.966,0] X-BeenThere: freebsd-transport@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Discussions of transport level network protocols in FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 23 Feb 2019 10:28:28 -0000 Bin grad am flughafen und hab leider nur HEAD bei mir (und ein iso von 10, = wo ich grad versuch, das mit scapy zu checken). Falls du schnell einen packetdrill gegen BSD11 ohne D18960 machen kannst, u= nd es da noch DSACKs raussendet, w=E4re das toll! Ich f=FCrchte aber, das das schon l=E4ngere Zeit kaputt ist - da wir nun do= ch noch nicht D18960 drinnen haben, wie ich irrt=FCmlich dachte. -----Original Message----- From: Michael Tuexen =20 Sent: Samstag, 23. Februar 2019 11:25 To: Scheffenegger, Richard Cc: freebsd-transport@freebsd.org Subject: Re: DSACK NetApp Security WARNING: This is an external email. Do not click links or o= pen attachments unless you recognize the sender and know the content is saf= e. > On 23. Feb 2019, at 10:29, Scheffenegger, Richard wrote: > > Hi, > > A colleague pointed me to the stack (HEAD) no longer emitting DSACK optio= ns a few days ago... > > I was under the impression, that older versions of FreeBSD would send out= DSACKs for spurious duplicate packets. > > But when I try this script against HEAD, regular cumulative ACKs without = DSACK blocks are showing up. > > Currently bandwidth starved - but was that a conscious decision? Or was m= e observing DSACKs never a thing? I would say if it is working in stable/11, but not in stable/12 and head, i= t is a regression. Best regards Michael > > Thanks a lot, > Richard >