Path: utzoo!attcan!uunet!lll-winken!lll-tis!ames!elroy!jpl-devvax!mike From: mike@jpl-devvax.JPL.NASA.GOV (Mike Tankenson) Newsgroups: comp.sys.proteon Subject: TCP & UDP over PRONET80 Message-ID: <3756@jpl-devvax.JPL.NASA.GOV> Date: 14 Dec 88 22:23:45 GMT Reply-To: mike@jpl-devvax.JPL.NASA.GOV (Mike Tankenson) Organization: Jet Propulsion Laboratory, Pasadena, CA. Lines: 37 References: I'm a new reader to this group, so please excuse me if this subject has been beaten to death. We're in the process of putting together a PRONET80 ring, running TCP/IP. The application involves several megabits of blocked telmetry data running between a Gould (and perhaps a Sun or Masscomp). We're trying to determine whether TCP or UDP would be more appropriate as the transport protocol. We have lots of experience with TCP/IP over Ethernet, but zilch when it comes to Token Ring. Question 1: How is UDP over Token Ring different than UDP over Ethernet? Here we're interested in collisions, checksum errors, slow receivers, retransmissions (built into the driver?). I know collisions are eliminated with Token Ring -- I'm interested in basic UDP behavior. Question 2: Given our Ethernet experience, we've found that back to back UDP packets will invariably overrun a receiver, causing loss of packets. Does this (or can this) happen on PRONET80? Probability? Question 3: If the answers to 1 and 2 above are positive (ie. UDP is much more reliable over Token Ring than Ethernet), then do you think UDP would be a suitable protocol to use for a high speed application such as ours? If anybody has archived any discussions on this topic, I'd be very grateful for a copy (via email). I'd take pointers to any magazine articles on the subject too. Thanks. PS: I have spoken to Proteon on this, and they basically said that UDP is slightly more reliable on Token Ring (no collisions, etc), but that there is still NO GUARANTEE that UDP packets will ever get delivered. Am I off base here? --mike -- Mike Tankenson Telos/Jet Propulsion Laboratory/NASA 4800 Oak Grove Drive, Pasadena, CA. 91109 Mail Stop: 301-260a Phone: (818) 354-1439 ARPA: mike@jpl-devvax.JPL.NASA.GOV UUCP: seismo!cit-vax!jpl-devvax!mike