Ipfilter Question

Dear All,

I want to allow only one connection for each ip address at the same time
using ipf. While exist an one connection from ip adress (for ex:
a.b.c.d) , if the same ip address (a.b.c.d) requests second connection
to my server, I want to drop second one. Because; in my scenario, there
should be only one connection exist from same ip address at the same time.

Is it possible or not?

Best Regards,