DRb - know clients identity

How can I know the clients identity from the server, I mean I want to
log in server side that the object was modified by the computer having
ip…
Am using DRb, and playing with the first example in :
http://segment7.net/projects/ruby/drb/introduction.html

Let me Google “drb client ip address” for you.

First hit:
http://www.ruby-forum.com/topic/2756411