From owner-freebsd-questions@FreeBSD.ORG Tue Feb 9 20:59:38 2010 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 77F2A1065670 for ; Tue, 9 Feb 2010 20:59:38 +0000 (UTC) (envelope-from nlandys@gmail.com) Received: from qw-out-2122.google.com (qw-out-2122.google.com [74.125.92.25]) by mx1.freebsd.org (Postfix) with ESMTP id 324828FC21 for ; Tue, 9 Feb 2010 20:59:37 +0000 (UTC) Received: by qw-out-2122.google.com with SMTP id 5so1053406qwd.7 for ; Tue, 09 Feb 2010 12:59:37 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:in-reply-to:references :date:message-id:subject:from:to:cc:content-type; bh=7oWK6VDoXtfVDSbEy1528s29R1gzP3OWhCQ92W4/LsU=; b=ZuUqhnWPiKclrhiNucpzHWvc1SwsRr+PRe+YRy7W2E/nY8QRzQRDA8RS20mUPc5alw MCzb197NaakkY5LvAkVM/vQ23aqkpc7tpWP+tv3Ef0+C+R2YRoKCCkKbL+ZS0gshHgq3 t20ilxaxhCKFzxdwhgK7dA/L9QigastoJ9VsY= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type; b=XQVfy14dERU75xDbn3MIIWVja6Mi+H65oGkOVECQ+q2iosd72aX1sJb3DBfL6k/28Y lizSRfnhIzlAoUKgchHsmP2coTR/3PEKBdbmzSyukoBx1E+TsSxIfFtSlDL4pcYS7m89 b5YF5ClbMSy3QVKu0qCsDDsLKDGgy8d00D8XQ= MIME-Version: 1.0 Received: by 10.229.13.20 with SMTP id z20mr1386304qcz.83.1265749177374; Tue, 09 Feb 2010 12:59:37 -0800 (PST) In-Reply-To: <021E6C4C-4EDD-4683-B2F0-0F2FCAE18FFF@mac.com> References: <560f92641002091241h65d4fb70sa7daafca885a2b1d@mail.gmail.com> <021E6C4C-4EDD-4683-B2F0-0F2FCAE18FFF@mac.com> Date: Tue, 9 Feb 2010 12:59:36 -0800 Message-ID: <560f92641002091259q4f4c0e3aq4c4b4696895c1f73@mail.gmail.com> From: Nerius Landys To: Chuck Swiger Content-Type: text/plain; charset=ISO-8859-1 Cc: FreeBSD Mailing List Subject: Re: Max UDP packet size + Java: weirdness 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: Tue, 09 Feb 2010 20:59:38 -0000 > You've encountered: > > % sysctl net.inet.udp.maxdgram > net.inet.udp.maxdgram: 9216 > > However, increasing it will guarantee that you will exceed even normal jumbo frame size and thus depend upon IP fragmentation / reassembly for the traffic. I don't consider that to be a good idea, but it might be OK for local traffic.... Wow thanks. So it normally fits in 1 IP packet? (What about the MTU being like 1500 or something?) What's wrong with fragmentation? Any links to explain this? This isn't local traffic by the way, I will be sending stuff between a data center in San Diego and a data center in Chicago.