Subject: Re: Serious NFS problem...
To: Brian C. Grayson <bgrayson@marvin.ece.utexas.edu>
From: Mason Loring Bliss <mason@acheron.middleboro.ma.us>
List: current-users
Date: 10/08/1998 08:45:11
On Fri, Sep 18, 1998 at 01:17:44AM -0500, Brian C. Grayson wrote:

> As one step in debugging it, you might try running tcpdump and
> seeing whether the client even sends the requests to the
> server.

Here's what I'm seeing go by via tcpdump. I don't see any of it as being
apropos to the problem, but... who knows? As for netstat output, I again
don't see anything relevant. :/

23:38:37.663847 styx.login > acheron.1019: P 369:710(341) ack 1 win 17520 <nop,nop,timestamp 56958 374> [tos 0x10]
23:38:37.861179 acheron.1019 > styx.login: . ack 710 win 17520 <nop,nop,timestamp 385 56958> [tos 0x10]
23:38:38.596114 styx.login > acheron.1019: P 710:810(100) ack 1 win 17520 <nop,nop,timestamp 56960 374> [tos 0x10]
23:38:38.661313 acheron.1019 > styx.login: . ack 810 win 17520 <nop,nop,timestamp 387 56960> [tos 0x10]
23:38:38.663296 styx.login > acheron.1019: P 810:1152(342) ack 1 win 17520 <nop,nop,timestamp 56960 374> [tos 0x10]
23:38:38.861331 acheron.1019 > styx.login: . ack 1152 win 17520 <nop,nop,timestamp 387 56960> [tos 0x10]
23:38:39.362789 acheron.who > 10.255.255.255.who: udp 300
23:38:39.612971 styx.login > acheron.1019: P 1152:1252(100) ack 1 win 17520 <nop,nop,timestamp 56962 374> [tos 0x10]

> Or if the server is sending replies that the client is
> dropping???

I'm not sure...

I'm trying out a couple ideas now, to try to get more information.

[...]

Okay. I'm still basically clueless.

One thing to note is that the same behaviour happens in both directions,
between the 1.3.2 box and the -current box. Other things to note: The cards
haven't changed, and when both were running 1.3.2, NFS worked fine. Yet
another thing to note is that when I was playing with Red Hat GNU/Linux on
what was and is again my -current box, I was able to use NFS between here
and the 1.3.2 box without any problems. (It was Red Hat 5.1, FWIW.)

Ideas will be appreciated.

Later...

PS: Manuel mentioned changing block sizes, as I remember... How can I do
this? Also, what has changed with our NFS code between 1.3.2 and now? I'd
love to use NFS to do some backup work. I used to use it for that before
the code broke... :/

-- 
Mason Loring Bliss..mason@acheron.middleboro.ma.us..acheron.dyn.ml.org/mason
"In the drowsy dark cave of the mind dreams build their nest with fragments
  dropped from day's caravan."--Rabindranath Tagore..awake ? sleep : dream;