IKE with RSA and Digital Signatures

[SV]

Hello friends   I am trying to play around in the lab with Cisco IPSec. Have been using the Cisco press book "Enhanced IP Services" book by Donald Lee. So far I have found it to be an excellent book. I am trying to work on IKE with RSA and Digital signatures. I tried downloading a Certificate Server from Netscape. I have never worked with any CA and am frantically trying to get cisco IKE/IPsec to interact with the CA. Dont know where I am going wrong. Will someone who has worked on such a scenario please help me. Any help will be appreciated.   Thanks   SV