HELP! Accessing NFS shares from Windows

[stevewabc]

I have a server with NFS and NIS and so forth all configured and working properly. I wish to be able to access the NFS shares on the server from several Windows XP boxes with Services for Unix loaded. I need to be able to secure the files so that the business data remains confidential.

I have managed to get WinXP/SFU to see the server and the NFS shares. I can map a drive within Windows to the shares, and even do read/write. However, I must make the shared directories chmod 0777 in order to make this work. What's the best approach to doing this while using the *nix permissions to keep things secure? My intent is to force a username/password login at least for each directory accessed, and perhaps even more granular if possible. Currently, all I get is a username/password challenge when I map the drive.

Thanks in advance for any words of wisdom (except dumping Windows, unfortunately that's not an option...)