From owner-freebsd-questions@FreeBSD.ORG Mon Apr 19 10:17:18 2004 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id A938C16A4CE for ; Mon, 19 Apr 2004 10:17:18 -0700 (PDT) Received: from smtpout.mac.com (A17-250-248-44.apple.com [17.250.248.44]) by mx1.FreeBSD.org (Postfix) with ESMTP id 8B85343D49 for ; Mon, 19 Apr 2004 10:17:18 -0700 (PDT) (envelope-from cswiger@mac.com) Received: from mac.com (smtpin01-en2 [10.13.10.146]) by smtpout.mac.com (8.12.6/MantshX 2.0) with ESMTP id i3JHGxXi028311; Mon, 19 Apr 2004 10:17:00 -0700 (PDT) Received: from [10.1.1.193] (nfw2.codefab.com [199.103.21.225] (may be forged)) (authenticated bits=0)i3JHGwJp014904; Mon, 19 Apr 2004 10:16:59 -0700 (PDT) In-Reply-To: <4082FCD0.7090600@daleco.biz> References: <407BFD3D.6030206@daleco.biz> <20040418193704.GA50421@ux1sjc1.calicat.org> <4082FCD0.7090600@daleco.biz> Mime-Version: 1.0 (Apple Message framework v613) Content-Type: text/plain; charset=US-ASCII; format=flowed Message-Id: <5A7A80A4-9225-11D8-9D0B-003065ABFD92@mac.com> Content-Transfer-Encoding: 7bit From: Charles Swiger Date: Mon, 19 Apr 2004 13:16:53 -0400 To: "Kevin D. Kinsey, DaleCo, S.P." X-Mailer: Apple Mail (2.613) cc: FreeBSD Questions list' Subject: Re: Interpreting ping response? (the POD lives??) X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 19 Apr 2004 17:17:18 -0000 On Apr 18, 2004, at 6:10 PM, Kevin D. Kinsey, DaleCo, S.P. wrote: > A further question, if I may ... from a FBSD box at 192.168.0.2, > I can ping 192.168.0.2 up to { -s 65507 }. Windows XP at *.*.*.10 > responds as long as { -s < 25153 } ... if Ethernet Maximum is 1500, > and that's the reason for the error why doesn't FreeBSD, or > even Windows, elicit a similar response? Nah, maybe that's a bad > question ... they aren't the same OS ... :-( > > So, MTU is an OS feature/stat rather than general Ethernet? You can send ICMP or UDP packets larger than the local MTU because the IP layer includes support for fragmenting datagrams if they are too big. This capability works remarkably well but can be expensive in terms of system resources to break apart and reassemble fragments. MTU is a parameter of a network transport layer, it has nothing to do with the OS... -- -Chuck