This is coming from someone that has not used optware, but has read up on it here in the forums and the wiki, so bzhou or someone else who may have more experience might chime in.
First, I was incorrect earlier in telling you where to store the exports file you created, so type this (where-ever)
mv /etc/exports /opt/etc/exports
Second, I checked here http://www.nslu2-linux.org/wiki/Optware/Nfs-utils
and the package you installed is a kernel-mode NFS daemon, which requires a kernel that supports NFS. The stock buffalo kernel does not support that, it seems.
You can read more about it here: viewtopic.php?p=88066#p88066
In the last post by Ramuk, he talks about unfs3 which is a userland NFS daemon, that may be the safer bet rather than trying to replace your kernel (albeit a bit slower).
I would suggest posting there for additional help installing unfs3, as this thread is massive, I'm not familiar with it, and don't have the ability to try installing it in my debian server to tell you what to do (hint: google setup unfs3), but report back if you have issues.
Hi. Right - making progress - thanks once again.
I've now uninstalled NFS-UTILS as you suggested and have installed UNFS3
My biggest challenge currently is getting the exports file edited.
vi is a real nightmare, and I can't seem to get my changes to the Exports file to save. Is there a really easy way to get some generic text in there? I don't particularly care about security, I just want my media streamer to be able to see the NFS server on the LinkStation. I keep getting "too many symbolic links" when I try and paste in the generic first line from your examples posted earlier.
Until I get the Exports file resolved, unfs3 won't start
Anyhelp anyone can give on a really simple Exports file, with some advice about how best to get the text into the file would be really appreciated. I'm not dumb, but I just can't get vi to work