You need to do that only once though, the OSD (Arizona fw) saves the details of your successful NFS and SMB mounts for future use.
You can mount NFS via telnet by the usual linux command. However this network connection is lost on reboot. If you're using Torfu, try:
http://forums.neurostechnology.com/smf/index.php?topic=7918.0and this can be modified to suit Arizona quite easily (read on to page 2).
You can also edit the OSD's network share file manually (Arizona only), it's to be found in /mnt/tmpfs/mount_CF-card/data/network.ini, whose syntax is:
[NFSSERVER]
NewConnectionName=NFSSERVER
ServerHostName=servername
ServerIPAddr=192.168.1.2
ServerShareFolder=sharedfolder
Type=1 //1=SMB, I think 0=NFS
UserName=user
UserPassword=pass
Hope this helps!
-G