Date: Tue, 18 Jul 2017 11:54:11 -0700 From: hiren panchasara <hiren@strugglingcoder.info> To: KVK Singh <krishnavijay@mnnit.ac.in> Cc: freebsd-net@freebsd.org Subject: Re: TCP Zero Window Advertisement. Message-ID: <20170718185411.GA48940@strugglingcoder.info> In-Reply-To: <CA%2BdH1tBpiTbrbWrS2BXnPb5a8_amHkPyst1GCfawdKOrTpp-kw@mail.gmail.com> References: <CA%2BdH1tBpiTbrbWrS2BXnPb5a8_amHkPyst1GCfawdKOrTpp-kw@mail.gmail.com>
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--17pEHd4RhPHOinZp Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On 07/18/17 at 11:28P, KVK Singh wrote: > Hi, >=20 > By going through the Zero Window advertisement concept What I found is th= at > if sender has transmitted packet 2,3,4,5,6,7 i.e packet from 2-7 total 6 > packets in flight then By chance if sender received a Zero Window > Advertisement (ZWA) for segment 4 then it does not enters in probe > mode/ persistent > state. However if it receive ZWA for 7 i.e last packet in flight then it > enters in Probe mode/ persistent state and it starts probing for window > update. Can you please site/explain how you got to this conclusion? Did you find FreeBSD or any other implementation doing this? >=20 > Is that the behavior is correct Because as going through the paper and RFC > I find that any segment can be acked with ZWA and sender will enter in > persist mode once it receive the ZWA. I thought this is how its supposed to work. I may be mis-remembering. Cheers, Hiren --17pEHd4RhPHOinZp Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 iQF8BAABCgBmBQJZbllQXxSAAAAAAC4AKGlzc3Vlci1mcHJAbm90YXRpb25zLm9w ZW5wZ3AuZmlmdGhob3JzZW1hbi5uZXRBNEUyMEZBMUQ4Nzg4RjNGMTdFNjZGMDI4 QjkyNTBFMTU2M0VERkU1AAoJEIuSUOFWPt/lDtAH/AgLxIS4qsc7SPx5mjYM5IF3 Os6dfgUqg4dCNbrLvszEXY4NRC2wz0kPSaYMOWvbPswMLQh2S7Wkj3Ozo41ytAod /96goGFEFhOyj0VF3z9DVBQjt7qXgQguRLEQ0XHvjmfn6LCs9lDs0XuFCddkYoUI Nluldn1M7Pa8XQjj/h473j90LKF7rXfZgM3rm2fkh5NVxofbudxpPMqPdGMz17z6 6OX0Yb124qphg+rk9iHEPSQP6J9II1S0q3Vmc3VqM4KBoIw5r7YB4hfeThpgkrjD wqoqt6NiULz9o0fWfQUboPsPt9v6Ml6b1EXmW9VQRJdzn/shBBcLkwVoRfKGlwM= =xgiw -----END PGP SIGNATURE----- --17pEHd4RhPHOinZp--
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