MTU 1500 means that the network layer datagram size is 1500 max. For IP this is the IP datagram including IP header and transport (TCP/UDP) header and data. Fragmentation occurs at the IP level and only the IP header is duplicated (except offset, checksum etc) into each fragment. The TCP/UDP headers are merely the first part of the data as far as IP is concerned and are therefore left untouched. HTH Marc
Paul Dong So wrote: > > Hi All, > > Please shed a light on this as I am confused. > > Fragmentation for UDP/TCP: > * Only the first fragment contains the UDP or TCP header, not the > sequencial fragments? > > Fragementation for IP packets > * every fragmented packet will contains ip header? > > MTU 1500 bytes, doesn't it mean the data payload can not exceed 1500 > bytes or the whole packet size(payload+header) can not exceed 1500 > bytes? > > Thanks in advance > > Paul Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=60653&t=60643 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
