Setup NFS on Red Hat 7.2 wasn't a problem; on RH 7.3,
I just cannot make it work. I've tried both nfs-utils-0.3.3
and nfs-utils-1.0.1.

When mount a volume of 192.168.1.2 to local 192.168.1.1,
(as a root) I got the following error:

# mount 192.168.1.2:/home /mnt/user
mount: RPC: Port mapper failure - RPC: Unable to receive

When mount a volume of 192.168.1.1 to local 192.168.1.2,
(also as a root) the operation hangs.

Other information :

# cat /etc/exports
/home 192.168.1.1(rw)

# mount 192.168.1.2:/home /mnt/user
mount: RPC: Port mapper failure - RPC: Unable to receive


# /etc/init.d/nfs restart
Stopping NFS mountd: [ OK ]
Stopping NFS daemon: [ OK ]
Stopping NFS services: [ OK ]
Stopping NFS quotas: [ OK ]
Starting NFS services: [ OK ]
Starting NFS quotas: [ OK ]
Starting NFS mountd: [ OK ]
Starting NFS daemon: [ OK ]

# ps -aux | grep nfs
root 7878 0.0 0.0 0 0 ? SW 23:18 0:00 [nfsd]
root 7879 0.0 0.0 0 0 ? SW 23:18 0:00 [nfsd]
root 7880 0.0 0.0 0 0 ? SW 23:18 0:00 [nfsd]
root 7881 0.0 0.0 0 0 ? SW 23:18 0:00 [nfsd]
root 7882 0.0 0.0 0 0 ? SW 23:18 0:00 [nfsd]
root 7883 0.0 0.0 0 0 ? SW 23:18 0:00 [nfsd]
root 7884 0.0 0.0 0 0 ? SW 23:18 0:00 [nfsd]
root 7885 0.0 0.0 0 0 ? SW 23:18 0:00 [nfsd]
root 7891 0.0 0.2 2240 636 pts/2 R 23:18 0:00 grep nfs

# ps -aux | grep rpc
rpc 736 0.0 0.2 1512 552 ? S 12:39 0:00 portmap
rpcuser 762 0.0 0.2 1556 568 ? S 12:39 0:00 rpc.statd
root 7868 0.0 0.1 1468 420 ? S 23:18 0:00 rpc.rquotad
root 7873 0.0 0.2 1548 616 ? S 23:18 0:00 rpc.mountd
root 7887 0.0 0.0 0 0 ? SW 23:18 0:00 [rpciod]


Please help..

Addition info - pstree report

# pstree
init-+-adsl-connect---pppd---pppoe
|-apmd
|-atd
|-bdflush
|-chinput
|-crond
|-cserver
|-eth0
|-eth1
|-gpm
|-kalarmd
|-kapmd
|-kdeinit-+-artsd
| |-kdeinit
| |-kdeinit---bash---pstree
| `-run-mozilla.sh---mozilla-bin---mozilla-bin---4*[mozilla-bin]
|-9*[kdeinit]
|-kdm-+-X
| `-kdm---startkde---kwrapper
|-keventd
|-khubd
|-klogd
|-korgac
|-ksoftirqd_CPU0
|-kswapd
|-kupdated
|-lockd---rpciod
|-mdrecoveryd
|-6*[mingetty]
|-8*[nfsd]
|-oafd
|-portmap
|-rpc.mountd
|-rpc.rquotad
|-rpc.statd
|-sshd
|-syslogd
|-tserver
|-xfs
`-xinetd

# rpcinfo -p
program vers proto port
100000 2 tcp 111 portmapper
100000 2 udp 111 portmapper
100024 1 udp 32768 status
100024 1 tcp 32768 status
391002 2 tcp 32769 sgi_fam
100011 1 udp 779 rquotad
100011 2 udp 779 rquotad
100011 1 tcp 782 rquotad
100011 2 tcp 782 rquotad
100005 1 udp 32769 mountd
100005 1 tcp 32770 mountd
100005 2 udp 32769 mountd
100005 2 tcp 32770 mountd
100005 3 udp 32769 mountd
100005 3 tcp 32770 mountd
100003 2 udp 2049 nfs
100003 3 udp 2049 nfs
100021 1 udp 32770 nlockmgr
100021 3 udp 32770 nlockmgr
100021 4 udp 32770 nlockmgr

Further testing indicates that maching 192.168.1.2 has
some problem.

Execute the following commands on 192.168.1.1,

# rpcinfo -p 192.168.1.2
rpcinfo: can't contact portmapper: RPC: Remote system error - Connection refused

# mount 192.168.1.2:/home /mnt/home
mount: RPC: Port mapper failure - RPC: Unable to receive

Execute the following commands on 192.168.1.2,
# rpcinfo -p 192.168.1.1
It correctly shows rpc services on 192.168.1.1

The rpc services on 192.168.1.2
# rpcinfo -p
program vers proto port
100000 2 tcp 111 portmapper
100000 2 udp 111 portmapper
100024 1 udp 1024 status
100024 1 tcp 1024 status
391002 2 tcp 1029 sgi_fam
100011 1 udp 668 rquotad
100011 2 udp 668 rquotad
100011 1 tcp 671 rquotad
100011 2 tcp 671 rquotad
100005 1 udp 1028 mountd
100005 1 tcp 1045 mountd
100005 2 udp 1028 mountd
100005 2 tcp 1045 mountd
100005 3 udp 1028 mountd
100005 3 tcp 1045 mountd
100003 2 udp 2049 nfs
100003 3 udp 2049 nfs
100021 1 udp 1029 nlockmgr
100021 3 udp 1029 nlockmgr
100021 4 udp 1029 nlockmgr

When reboot 192.168.1.1, the exported partition /home
has to go throught disk checking because it has been mounted
20+ times.

I found that it is firewall caused the problem on 192.168.1.2

# ipchains -L
REJECT tcp -y---- anywhere anywhere any -> nfs
REJECT udp -y---- anywhere anywhere any -> nfs

What should I do with it?

This problem has been solved by turning off firewall on that
system "/etc/init.d/ipchains stop".