NFS: Problems connecting HP400t and SGI

[Philipp]

Hello,

We have got the problem that SGI and HP workstations don't like to work
together via NFS. Here is the problem:

We have a large network (university) with several SGI-workstations on the
backbone net.
Attached to it is a HP discless cluster (5 HP400t at one server) that
is connected to the backbone by a UNIX-PC (386 running Interactive Unix) that
is only acting as a router (no other tasks).

Connections from either the HP's or the SGI's to other hosts on the net (via
the router or not) are no problem, but access between SGI and HP (either
direction) don't work. The problem is mostly apparent on large files, when
a programm accessing it, halts with the message 'NFS server not responding'.
After a while the message 'NFS server OK' appears, but (on the next package ?)
we start again with 'not respondig'. 
Small files seem to be ok, most of the time.

Maybe others have had this problem before an can send suggestions on a fix.
Any help is welcome.

Here the data on the machines:
	HP: Serie 9000, HP400t, HP-UX 7.05 (7.03 is same problem), 16MB, 3x660MB SCSI
			disks on the server.
	SGI: W-4D210GTXB and W-4D25TG-I, IRIX 3.3.2, 16MB, 300MB local disk each

Network:
The backbone is a thick ethernet, while the cluster is on a thinwire.

     .
     . (lots of other machines)                                      . 
     .                                       .  ( 5 more HP's)
     |               +----------+            .
     +---------------|   SGI    |            |
   B |               +----------+            |     +---------------+
   a |                                       +-----|  HP Client    |
   c |               +----------+            |     +---------------+
   k +---------------|  SGI II  |            |
   b |               +----------+            |     +---------------+
   o |                                       +-----|   HP Server   | 
   n |               +----------+            |     +---------------+
   e +---------------| UNIX PC  |------------+
     |               +----------+
     .
     .

Philipp Slusallek                  Universitaet Tuebingen, WSI/GRIS
                          Auf der Morgenstelle 10-C9, D-7400 Tuebingen, FRG
Email: philipp at gris.informatik.uni-tuebingen.de         Phone: +49-7071-295462
--
Philipp Slusallek                  Universitaet Tuebingen, WSI/GRIS
                          Auf der Morgenstelle 10-C9, D-7400 Tuebingen, FRG
Email: philipp at gris.informatik.uni-tuebingen.de         Phone: +49-7071-295462