From owner-freebsd-net@FreeBSD.ORG Tue Mar 1 09:37:28 2011 Return-Path: Delivered-To: freebsd-net@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 17F73106564A for ; Tue, 1 Mar 2011 09:37:28 +0000 (UTC) (envelope-from saurav.dasgupta@aricent.com) Received: from jaguar.aricent.com (jaguar.aricent.com [180.151.2.24]) by mx1.freebsd.org (Postfix) with ESMTP id 3FAF88FC0A for ; Tue, 1 Mar 2011 09:37:26 +0000 (UTC) Received: from jaguar.aricent.com (localhost [127.0.0.1]) by postfix.imss71 (Postfix) with ESMTP id 316FF36B94 for ; Tue, 1 Mar 2011 14:46:22 +0530 (IST) Received: from GUREXHT02.ASIAN.AD.ARICENT.COM (gurexht02.asian.ad.aricent.com [10.203.171.138]) by jaguar.aricent.com (Postfix) with ESMTP id 1BA9036B8F for ; Tue, 1 Mar 2011 14:46:22 +0530 (IST) Received: from GUREXMB02.ASIAN.AD.ARICENT.COM ([10.203.171.130]) by GUREXHT02.ASIAN.AD.ARICENT.COM ([10.203.171.138]) with mapi; Tue, 1 Mar 2011 14:49:30 +0530 From: Saurav Dasgupta To: "freebsd-net@freebsd.org" Date: Tue, 1 Mar 2011 14:49:29 +0530 Thread-Topic: TCP Buffer window size is not getting updated Thread-Index: AcvX8cSnhmodRmqaQNSfKKP34paFPQ== Message-ID: <6072DA4A344C23459096E69EB3F4570D020B03B5BD@GUREXMB02.ASIAN.AD.ARICENT.COM> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: acceptlanguage: en-US MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable X-Content-Filtered-By: Mailman/MimeDel 2.1.5 Subject: TCP Buffer window size is not getting updated X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 01 Mar 2011 09:37:28 -0000 Hi, We are facing the issue with TCP connection buffer size. TCP session is up. By default the rx buffer window size is 64k.Traffic flow= is fine. When the buffer size is increased while connection is up, rx buff= er window size is updated automatically with the new value. But if we decrease the buffer size below the default value i.e. 64k, window= size is not getting updated. To get it updated, we need to prune the conne= ction and setup with the new value(which is lesser than the default window = size). Is this a expected behavior in FreeBSD IP stack. Currently we are using Fre= eBSD v7.2. Thanks and Regards, Saurav ________________________________ "DISCLAIMER: This message is proprietary to Aricent and is intended solely = for the use of the individual to whom it is addressed. It may contain privi= leged or confidential information and should not be circulated or used for = any purpose other than for what it is intended. If you have received this m= essage in error, please notify the originator immediately. If you are not t= he intended recipient, you are notified that you are strictly prohibited fr= om using, copying, altering, or disclosing the contents of this message. Ar= icent accepts no responsibility for loss or damage arising from the use of = the information transmitted by this email including damage from virus."