From owner-freebsd-questions@FreeBSD.ORG Thu May 24 19:10:56 2007 Return-Path: X-Original-To: freebsd-questions@freebsd.org Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id 3856916A468 for ; Thu, 24 May 2007 19:10:56 +0000 (UTC) (envelope-from af300wsm@gmail.com) Received: from py-out-1112.google.com (py-out-1112.google.com [64.233.166.177]) by mx1.freebsd.org (Postfix) with ESMTP id EE7FB13C457 for ; Thu, 24 May 2007 19:10:55 +0000 (UTC) (envelope-from af300wsm@gmail.com) Received: by py-out-1112.google.com with SMTP id a29so1040341pyi for ; Thu, 24 May 2007 12:10:55 -0700 (PDT) DKIM-Signature: a=rsa-sha1; c=relaxed/relaxed; d=gmail.com; s=beta; h=domainkey-signature:received:received:message-id:date:from:to:subject:mime-version:content-type:content-transfer-encoding:content-disposition; b=IcWzkbbJy+xYwY7gCC77YuQ30nmzGbL2oj8MAil3E9hXVuH4oksh9AdF03ZntiWUoD/w6SRNBI3yoIi5iak+rTD2IGdDbbh0tLwrldu3OqYI/0NvQ7dGaVF2EAmTDPzzmf6tSAXmitJOLbP94UL4NFk1WlDboAlczx+Bg/K/PXY= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=beta; h=received:message-id:date:from:to:subject:mime-version:content-type:content-transfer-encoding:content-disposition; b=fSzgGNjgIwbJFYMcxBSukOJzFKDBxRoSqxnhKEgUAvQLeU9pzRrK4kpu+4YvqblMrqtyKObNIavFDvBmEISZwIcCsqHNPWy2LyaJjp6yKmWhSANn0VWBrSN0WlfYyImK8WXQFigxIMCJ28cnlm/Em+r4rXu7TfNJIGmT+gqvpWY= Received: by 10.35.18.4 with SMTP id v4mr2819301pyi.1180033855319; Thu, 24 May 2007 12:10:55 -0700 (PDT) Received: by 10.35.36.17 with HTTP; Thu, 24 May 2007 12:10:55 -0700 (PDT) Message-ID: <340a29540705241210qa6895bem9d4aa1a5d2dd05a0@mail.gmail.com> Date: Thu, 24 May 2007 13:10:55 -0600 From: "Andrew Falanga" To: freebsd-questions MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Content-Disposition: inline Subject: How does FreeBSD handle tcp checksum offloading X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 24 May 2007 19:10:56 -0000 Hi, I'm curious as to how FreeBSD handles checksum offloading for TCP packets. Is this on by default? It seems that it's only relevant for specific drivers rather than something that's just assumed. How can I determine if this is supported for the hardware I'm running? Is it common for tcp checksum offloading to be in the fxp driver? Can one turn it off (though, it honestly sounds like no one would wish to do so)? Andy