Virt-install cannot mount nfs directory

Hi all,
I'm trying to use ovms but I cannot create any virtual machine.
I successfully installed OVMS; I disabled iptables to avoid network problems.
I created a dvd from Oracle Unbreakable EL 5.0 cds on a different machine.
The dvd image is shared by a linux CentOS box. The ISO image is inside /opt/tmp_os_isos/50 so I did
service nfs start
mkdir /mnt/dvd50
chmod a+rwx /mnt/dvd50
mount -o ro,loop /opt/tmp_os_isos/50/Enterprise-R5-GA-Server-i386-dvd.iso /mnt/dvd50/
exportfs *:/mnt/dvd50
and on the ovms server I did:
[root@ovms ~]# virt-install
What is the name of your virtual machine? giallo2
How much RAM should be allocated (in megabytes)? 512
What would you like to use as the disk (path)? /virtpcs/dischi/giallo
How large would you like the disk (/virtpcs/dischi/giallo2) to be (in gigabytes)? 30
Would you like to enable graphics support? (yes or no) no
What is the install location? nfs:10.10.10.242:/mnt/dvd50
And I always end up with the error
That directory could not be mounted from the server.
If I try to run
[root@ovms ~]# mount.nfs 10.10.10.242:/mnt/dvd50 /mnt/50
it works!
I also tried to build adifferent dvd iso, or to uso a OEL 4.4 dvd iso (taken from an original working oracle dvd) but I always end up with the same error
Where am I wrong?
thanks, andrea

I realized this problem was somehow related with the ovms installation: the pc I installed ovms on has two network card; when I installed ovms I configured eth0 via DHCP (eth0 is linked to the office network and to internet) and I configured eth1 with a static IP (eth 1 is connected to a "private" network made by 2 more pc).
I also choosed to manage ovnms via eth1 (the network card witch has a statis ip), and everything regardind ovms has always been done via eth1.
Now I reinstalled ovms and I choosed to manage it via eth0 (si I put a static ip address on eth0) and everything seems working: I'm just installing OEL5.0 via nfs without any problem (I hope... :-) )
andrea

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    293G 40G 58G 42% /zonedev/dbspfox1/biblio/P622/preprod/data
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