Subject: Re: Serious NFS problem...
To: Brian C. Grayson <>
From: Mason Loring Bliss <>
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 > 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.


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
"In the drowsy dark cave of the mind dreams build their nest with fragments
  dropped from day's caravan."--Rabindranath Tagore..awake ? sleep : dream;