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- Xref: sparky comp.mail.headers:413 comp.mail.misc:4208
- Newsgroups: comp.mail.headers,comp.mail.misc
- Path: sparky!uunet!spool.mu.edu!torn!newshub.ccs.yorku.ca!yorku.ca!davecb
- From: davecb@nexus.yorku.ca (David Collier-Brown)
- Subject: Re: Return and read receipts (was Re: Return-Receipt-To & forwarding...)
- Message-ID: <davecb.725999782@yorku.ca>
- Sender: news@newshub.ccs.yorku.ca (USENET News System)
- Organization: York University
- References: <1992Dec29.181814.4105@chance.gts.org> <1992Dec31.003223.22169@blilly.UUCP> <davecb.725911218@yorku.ca> <1993Jan2.042941.2066@blilly.UUCP>
- Date: Sat, 2 Jan 1993 18:36:22 GMT
- Lines: 48
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- |In article <davecb.725911218@yorku.ca>,
- | posted to comp.mail.headers,comp.mail.misc,
- | davecb@nexus.yorku.ca (David Collier-Brown) wrote:
- |>
- |> This assumes store-and forward, something which is getting
- |>less and less poplular at time passes, and was never part of
- |>the RFC world anyway.
-
- bruce@blilly.UUCP (Bruce Lilly) writes:
- |As network topologies and sizes change, it is sometimes enlightening to review
- |one's assumptions. To take another mail-related example, it used to be the
- |case that a moderate number of "hops" (say two dozen) could be considered to
- |be an indication of a mail loop. [...]
-
- Ah, good, some actual facts to discuss.
-
- Yes, I've noticed that I've had to increase the threshold for
- loop-detection because of sites as far away as New Zealand and Georgia
- (in the former USR, not the U.S.), and tht does indicate more
- store-and-forward connections on the periphery of the Internet, thus
- supporting your position.
-
- At the same time, I've been noticing a commensurate fall in the number
- of hops to very distant sites (eg, Finland, Australia).
-
- I interpret this as a ``two wave'' effect, with connectivity being
- achieved initially via UUCP and other private-net store-and-forward
- protocols, then upgrading to IP, giving ``direct'' connectivity. I
- see exactly that in the local Toronto area, with the proposal and
- implementation of an IP Metropolitan Area Network...
-
- I speculate that this is a universal phenomenon, and expect to be able
- to turn down my hop-counter once the major discontinuous nets ether
- join the Internet or otherwise reduce their tendancy to do
- store-and-forward transport. From comments by the victims of some of
- the European networks, the Internet is gaining rapidly on the PTTs.
- Certainly Canada's experience has been that x.400 and ISO
- (conection-oriented) networking is less deliverable to real customers
- than IP.
-
- --dave (thanks for the light amoungst the heat) c-b
- --
- David Collier-Brown, | davecb@CCS.YorkU.CA | lethe!dave
- 72 Abitibi Ave., |
- Willowdale, Ontario, | York Postmaster and
- CANADA. 416-223-8968 | occasional sendfail(8) consultant.
-