From mboxrd@z Thu Jan 1 00:00:00 1970 From: Rafal Jaworowski Date: Wed, 29 Aug 2007 09:37:36 +0200 Subject: [U-Boot-Users] Multicast TFTP problems In-Reply-To: <46CD94A5.8070606@qstreams.com> References: <46CD5641.7060306@semihalf.com> <46CD94A5.8070606@qstreams.com> Message-ID: <46D52240.1030209@semihalf.com> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de Ben Warren wrote: [...] > TFTP packets are structured as follows: > > | Eth header (14 bytes) | IP header (20 bytes) | UDP header (8 bytes) | > TFTP message | Eth FCS (4 bytes) | > > You can see that the total overhead is 46 bytes. If your network port's > maximum MTU size is 1500 bytes (the default), the math works out for a > maximum TFTP PDU size of 1454 bytes. > > However... the Ethernet header/trailer is not supposed to be included in > the MTU. I suspect we have a terminology problem here. Let me dig a bit > further to find out what's going on. > Hi Ben, Did you manage to look at this any further? kind regards, Rafal