This article is from the SSH - Secure Shell FAQ, by Thomas Koenig Thomas.Koenig@ciw.uni-karlsruhe.de with numerous contributions by others.
There is a general working solution for RPC-based services, such as
NIS. You can download it from ftp://ftp.tu-
chemnitz.de/pub/Local/informatik/sec_rpc/. NIS, in particular, is
working.
In principle, this could also be adapted for NFS; this has not been
done yet.
Services which are based purely on UDP, such as DNS, have not been
secured with ssh yet, although it is possible in principle.
 
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