Thanks for the answers. I managed to get Openview 6.1 on solaris 8, with the encryption capabilities. So, I have a Director 2.2.2 and a sensor 2.5 communicating via IPsec in regard to alerts.
I realize the documentation recommends disabling IPsec for any remote configuration changes. Of course I tried it once and lost communication with the sensor. Are there any further patches/releases for allowing management via IPsec, or possibly a new release in the future?