I m sorry I didn t see your reply.
I don t have internet, I d like have a wifi network where i can connect with multiple devices (so i used dhcp server) and be able to ping and use my static device (the top client you can see in my first diagram, with static ip 192.168.1.42). Idk why configuration i set (in my first post) works in 7* version and not in 6*.
I just have a constraint, to not set the gateway in the dhcp server, so when i m connected to wifi with my smartphone, i can use my mobile data to have internet (http://forum.mikrotik.com/t/no-internet-flag-on-mikrotik/158463/6)