Yes Gerry is right there is no clean client for Linux.  Just to to be 
clear though if you are an existing Netware 5.1 customer with upgrade 
protection you are entitled to Native File Access pack for free.  Here 
is the snip taken from http://www.novell.com/products/nfa/pricing.html

"Current NetWare 5.1 customers with upgrade protection/maintenance, will 
receive Novell Native File Access Pack free of charge through the normal 
upgrade process. For customers not paying upgrade protection on NetWare 
5.1, Novell Native File Access Pack will cost $299 per server."

If your just looking for secure authentication then you should be taking 
Gerry's advice and working to get secure LDAP up and running.  Here are 
couple of  TID's that should get you in the right direction in setting 
this up.  

How to configure LDAP for SSL (Secure) Connections
http://support.novell.com/cgi-bin/search/searchtid.cgi?/10023209.htm

The Novell LDAP Frequently Asked Questions (FAQ) Might also be of help
http://support.novell.com/cgi-bin/search/searchtid.cgi?/10062287.htm

Good luck

-Keith

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