Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!samsung!dali.cs.montana.edu!uakari.primate.wisc.edu!zaphod.mps.ohio-state.edu!rpi!uupsi!sunic!nuug!ifi!jon From: jon@ifi.uio.no (Jon Oelnes) Newsgroups: comp.protocols.iso Subject: Route Recording in ISO 8473 Message-ID: Date: 11 Oct 90 10:55:09 GMT Sender: jon@ifi.uio.no (Jon Oelnes) Organization: Dept. of Informatics, University in Oslo, Norway Lines: 20 Nntp-Posting-Host: gode.ifi.uio.no Originator: jon@gode.ifi.uio.no In the ISO connection-less network protocol (ISO8473) one function is Route Recording. I have only an old copy (DIS version) at hand, and my question is if the following text is still valid, and if my interpretation is correct: "When Complete Route Recording is selected, PDU reassembly at _intermediate systems_ is performed only when the Derived PDUs that are reassembled all took the same route; otherwise the PDU is discarded, .." Now, reassembly is normally performed in the final _end system_, not in the ISes. My interpretation of the text is that no restriction is posed on reassembly in the _end systems_. An ES may perfectly well reassemble fragments which have followed different routes. Also, the point of discarding (in an IS) fragments which followed different routes, is only valid if the IS really does reassembly. If it just passes the fragments on, no error occures. Comments, anyone - by E-mail if this is not considered to be of general interest. Thanks in advance. Jon Oelnes, Norwegian Computing Center, Oslo E-mail: Jon.Olnes@nr.no or jon@ifi.uio.no