Apache SSHD - IP filtering/selector?

[Daniel Henrique Alves Lima]

   Hi.

   A newbie question:
   Is it possible to write an UserAuth that will refuse connections 
based on the client IP? Is it possible to prevent connection from a 
range of IPs in any other way? How?
   I have a dynamic range of IPs and I want to simply allow or deny 
connections coming from those IPs. How should I proceed?

   Thanks in advance.

        Best regards,

            Daniel.