nfs mount problems

server
grenada / # cat /etc/exports |grep -v '#'
/var/www 192.168.0.0/24(rw)
grenada / #

client
dads / # mount -t nfs 192.168.0.1:/var/www /mnt/GRENADA
mounts it
but
dads apache2 # mount -t nfs grenada:/var/www /mnt/GRENADA
mount: grenada:/var/www failed, reason given by server: Permission denied
dads apache2 #

even though
dads apache2 # ping grenada
PING grenada.home.nw(192.168.0.1) 56(84) bytes of data.
64 bytes from vexim (192.168.0.1): icmp_seq=1 ttl=64 time=0.506 ms
64 bytes from vexim (192.168.0.1): icmp_seq=2 ttl=64 time=0.494 ms
64 bytes from vexim (192.168.0.1): icmp_seq=3 ttl=64 time=0.484 ms

--- grenada.home.nw ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2002ms
rtt min/avg/max/mdev = 0.484/0.494/0.506/0.027 ms
dads apache2 #

if the server /etc/exports is

grenada / # cat /etc/exports |grep -v '#'
/tmp 192.168.0.0/24(rw)
/home 192.168.0.0/24(rw)
grenada / #

home mounts but tmp doesnt
why doesnt DNS lookup work within nfs ?
why cant I mount the /tmp directory ?

One possibility:

Are the user.group ids equal. Unless you have NIS or some
authentication service in place, the user and group _numbers_ must be
the same on both machines.

Hey,

What is the actual output of exportfs? Also, not that this fixes the
problem, or by the looks of it would, have you tried to relax your nfs
permissions to * temporarily? (or even 192.*)

Also curious, what OS versions are you running?

OS =gentoo ( both machines)

server

grenada ~ # cat /etc/passwd |grep paul
paul:x:1009:100::/home/paul:/bin/bash
grenada ~ # cat /etc/passwd |grep root
root:x:0:0:root:/root:/bin/bash
operator:x:11:0perator:/root:/bin/bash

grenada ~ # exportfs -ra
exportfs: /etc/exports [9]: No 'sync' or 'async' option specified for export
"*:/tmp".
Assuming default behaviour ('sync').
NOTE: this default has changed from previous versions
exportfs: /etc/exports [11]: No 'sync' or 'async' option specified for
export "*:/home".
Assuming default behaviour ('sync').
NOTE: this default has changed from previous versions
grenada ~ # exportfs
/home <world>
/tmp <world>
grenada ~ #

client
# cat /etc/passwd |grep paul
paul:x:1009:100aul:/home/paul:/bin/bash
# cat /etc/passwd |grep root
root:x:0:0:root:/root:/bin/bash
operator:x:11:0perator:/root:/bin/bash
#

and then

dads zope-2.7.7 # mount -t nfs 192.168.0.1:/home /mnt/GRENADA
dads zope-2.7.7 # umoount /mnt/GRENADA/
bash: umoount: command not found
dads zope-2.7.7 # umount /mnt/GRENADA/
dads zope-2.7.7 # mount -t nfs 192.168.0.1:/home /mnt/GRENADA
dads zope-2.7.7 # umount /mnt/GRENADA/
dads zope-2.7.7 # mount -t nfs 192.168.0.1:/tmp /mnt/GRENADA
mount: 192.168.0.1:/tmp failed, reason given by server: Permission denied
dads zope-2.7.7 # mount -t nfs grenada:/home /mnt/GRENADA
mount: grenada:/home failed, reason given by server: Permission denied
dads zope-2.7.7 #

I still cant work out what gong on

The reply orders are a little messy...

Have a look in /var/log if you haven't aready and check for some better
indication on the server as to why it is rejecting access to the
clients. So you can mount /home, but then you try /tmp and after that
/home stops working? There has got to be something in the logs...

By any chance are you running your own DNS server?