If the NIM connection is acting funny:

server: startsrc -s nimesis
rm /etc/niminfo
(options for adding clients)
lsnim -q define -t standalone
smitty nim_mkmac

smitty nim (configure)
or
niminit -a name=drviop02 -a master=nad0019aixd10

Fastpath to client installer:
smitty nim_client_inst