On Wed, 14 Apr 1999, Alan Cox wrote:
> > ifconfig shows everybody up and not dropping packets. Most boxes talk
> > to each other and swap packets at a rate of 0.1 - 0.2 ms. The box
> > having trouble has a round trip time of 9ms (more or less) due to it's
> > distance from all of the other machines on the network.
>
> 9ms ?? just how many repeaters do you have on that segment
Hi Alan - it is about 6 hops from my desk to the remote server.
This is New York City and we are about 10km from the remote box
that is having a bad day...
What happens is that we have a leased line that goes through the
local `Teleport'. So I can monitor what's happening on the two
ends but not the middle (although it's near time to pay someone
there to look into this.)
> > 3) YET, if I telnet into MACHINE A from any remote box (unix or windoze)
> > from any location (1 klick away or 10) then MACHINE A chokes. Even
> > PINE hangs until I kill the rlogin...
>
> If you ping machine A from the outside what does it look like from another
> machine on the network. Do you see the pings, do you see replies going out
> and being lost ?
That is the hard part. I have sniffit running as we speak:
# sniffit -P icmp -b -s [ IP of disgruntled box ]
On another box I have ping running with -s 200
(using Tim Fletcher's idea of cranking up the packet size to 200b)
This increases the round trip to 13.9 ms but sniffit sees the packets
coming and going without mishap and ping reports no packets lost.
> This is the sort of bug that generates patients Im afraid. You want to look
> at what is going on from another machine on the lan.
Since my first post the round trip has degraded from 9 ms to 10.1 (avg).
So I made a dummy server running linux (slack)/perl/postgres and fired it
up on the remote network. I telnetted to it from my home console (again,
about 10k away) and the same problem occurs. At least I'm consistent. :-(
Today, queries that return about 87 tuples are occasionally echoed back
but *long* after the query finishes on the remote box (say 5 minutes!)
Tommorrow I change hubs...that is about the last piece of equipment I
can swap out...
Anyway - thanks to you and Tim Fletcher for the help,
Tom
----
North Richmond Community Mental Health Center
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Thomas Good Information Systems Coordinator
E-Mail: tomg@ { admin | q8 } .nrnet.org
Phone: 718-354-5528
Fax: 718-354-5056
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