You are the best !
I have delete free DNS service.
Add the 2 rules you give me.
And tataam : It’s pretty fine now !
They use nbscan program to find trough port 53 system behind Zeroshell.
nbscan -f -p 53 192.168.2.0/24 by example.
Before change it, all systems was able to be see by this utilitie.
After change, nothing displayed.
And captive portable still running fine !
Thanks for your help.