From AIX/6000 Network Services, NFS, NIS, DNS Student Notebook taken 4/26/95.

NFS Daemons

Activity     |   Client    |   Server
-------------+-------------+------------     When mountd starts on the server,
Mount        |  RPC    <------> portmap      it "registers" with portmap as being  
             |             |    mountd       available.  When a client mounts an
-------------+-------------+------------     NFS file system, it asks portmap, who
open/read    |  biod   <------> nfsd         returns mountd's socket (host,port#).
close/write  |             |
-------------+-------------|------------
fcntl()      |  statd  <------> statd
             |  lockd  <------> lockd
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/etc/exports contains the files available for export, but it's not read by the
       mountd daemon.  rc.nfs runs exportfs -a, which copies /etc/exports to
       /etc/xtab, which is what mountd reads.

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To avoid these cryptic error messages, when mount -r rhino:/dfs /rhino_dfs 

nfsmnthelp: 1831-019 rhino: System call error number -1.

mount: 1831-008 giving up on:
rhino:/dfs
System call error number -1.

ensure rhino can reverse-resolve the machine you're coming from.

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You (evidently) cannot specify a wildcard for smitty's "HOSTS allowed root access"
field (which translates into the chnfsexp command's -r option).  I tried using *,
but it didn't work as expected.  Instead, I had to list all the clients, which
gets translated into this in the /etc/exports file.

/dfs -root=bear:buffalo:jasmine:elk:gecko:ghost:giraffe:jasper:lizard:minkie:patimg1:patimg2:penguin:phoebe:polecat:reindeer:skunk:walrus:zingo:grumpy:adam:jenny:melanie:agam:vinu:jacob:mark:kristine:afs1:loon
/dfsrw -root=bear:buffalo:jasmine:elk:gecko:ghost:giraffe:jasper:lizard:minkie:patimg1:patimg2:penguin:phoebe:polecat:reindeer:skunk:walrus:zingo:grumpy:adam:jenny:melanie:agam:vinu:jacob:mark:kristine:afs1:loon

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The NFS daemons can/do listen in either the UDP or TCP protocols.  Typically,
they listen in both.  To see what daemons are listening in on what protocols and
ports, try rpcinfo -p.

Program     Program
Name        Number   Versions  Protocols   Port   Comments
=======     =======  ========  =========  ======  ====================
portmapper   100000    2-4     UDP & TCP     111  Fixed
rstatd       100001    1-3     UDP & TCP   32769  Variable
pcnfsd       150001    1-2     UDP         32773  Variable
nfs          100001    1-3     UDP & TCP   32769  Variable
             100001    1-3     UDP & TCP   32769  Variable
             100001    1-3     UDP & TCP   32769  Variable
             100001    1-3     UDP & TCP   32769  Variable
             100001    1-3     UDP & TCP   32769  Variable

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Other NFS commands and their related daemons are rup/rstatd, rusers/rusersd,
       rwall/rwalld, spray/sprayd, on/rexd, and showmount/mountd.

All of those daemons can be found in /etc/inetd.conf.

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NIS Daemons
                 |   Client     |    Server
-----------------+--------------+--------------
login            |  ypbind   <-----> ypserv         yp = Yellow Pages
name resolution  |              | 
                 |              |
change password  |  yppasswd <-----> yppasswdd

yppasswd isn't a daemon, really.  It's just a substitute for the passwd command.

/etc/passwd has "escape" sequence in it of "+::0:0:::" to say from now on, use
the NIS server to validate this userid.
/etc/group also has a similar escape sequence of "+:".

Other NIS commands are ypwhich, ypset, ypinit, ypmatch, ypcat, makedbm, yppoll,
     domainname, yppush, and ypxfr.