Are you forcing full-duplex in all machines?
Other thing could be the disk usage at that time, install the package
sysstat in order to monitor the disks on the server using iostat.
Just my 2 cents :)
2011/3/29 kevin <lists at cybercolloids.net>
> I have a small network in an office. A Debian server supplying /home
> directories to a small group of Ubuntu clients using NFS4. Typically
> there will be about 1/2 dozen people using the network, authentication
> is via NIS and the server also acts as a gateway to the wider world.
> Networking is 100Mb ethernet distributed around the office by a couple
> of switches.
>> This all works fine and is generally quite responsive but occasionally
> it seems to go into super-slow mode. For example: yesterday someone
> tried to open a large (24mb) pdf on the network and it took several
> minutes to open.
>> I have checked routing tables, DNS and mounting NFS shares async.
>> Any thoughts on why this might occasionally happen - seems a bit random.
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