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- Newsgroups: comp.os.vms
- Path: sparky!uunet!decwrl!zazen!news
- From: stevens@vms.macc.wisc.edu (PAul STevens - MACC - 2-9618)
- Subject: Re: Vax to Ultrix delay over decnet
- Message-ID: <1992Jul22.170955.22876@macc.wisc.edu>
- Sender: news@macc.wisc.edu (USENET News System)
- Organization: University of Wisconsin Academic Computing Center
- Distribution: usa
- Date: 22 JUL 92 12:02:44
- Lines: 27
-
- In article <1992Jul20.145557.24659@av8r.uucp>, mrandall@av8r.uucp (Mark Randall) writes...
- > When we dlogin from ultrix to vms, all works well. Going the
- >other way, vms to ultrix (via SET HOST), we experience really long
- >delays when text is printed to the screen. Once logged in, I can type
- >normally and text will be displayed until it just STOPS for no
- >apparent reason! The pause occurs on average for 7-9 seconds, and then
- >the text resumes printing, as if nothing had happened. There is no
- >such pause going the other way.
- > This one's really got me baffled, folks. Anyone have an idea?
- >I don't even know which system has the problem, but it looks like a
- >quota is set too low somewhere...
- >
- > Mark
-
- I have found that this happens when an ethernet packet is lost. The
- decnet timeout value is 6 seconds. Can't be changed as far as I can
- tell. Telnet's timeout is generally a few tens of milliseconds.
- Decnet must have been manufactured in a clean-room with three nodes.
- It works rather poorly on busy, noisy networks. I have fought these
- problems for years and all I can ever get from DEC is advice to make
- the ethernet work better. IP protocols are much more robust. I have
- seen cases where over 80 percent of packets sere being lost (no---that
- is not normal, even here!) and telnet users had no complaints. VAX
- clusters simply crashed.
-
- PAul
- >
-