Hi!
Thank you for your reply.
I've cleaned up the configuration and tryed what you suggested me, but it doesnt work.
Right now, the complete setup is this one, maybe with all the parameters it's easier
/interface bridge
add admin-mac=*** auto-mac=no name=bridge
/interface wireless
set [ find default-name=wlan1 ] band=2ghz-b/g/n channel-width=20/40mhz-XX country="us 2.4 5.8" disabled=no distance=indoors frequency=auto frequency-mode=manual-txpower installation=indoor mode=ap-bridge ssid=*** wireless-protocol=802.11
/interface pwr-line
set [ find default-name=pwr-line1 ] disabled=yes
/interface list
add comment=defconf name=WAN
add comment=defconf name=LAN
/interface wireless security-profiles
set [ find default=yes ] authentication-types=wpa2-psk eap-methods="" mode=dynamic-keys supplicant-identity=MikroTik wpa2-pre-shared-key=***
/ip pool
add name=default-dhcp ranges=192.168.1.180-192.168.1.250
/ip dhcp-server
add add-arp=yes address-pool=default-dhcp disabled=no interface=bridge name=defconf
/interface bridge port
add bridge=bridge interface=ether2
add bridge=bridge interface=ether3
add bridge=bridge interface=ether4
add bridge=bridge interface=pwr-line1
add bridge=bridge interface=wlan1
/ip neighbor discovery-settings
set discover-interface-list=LAN
/interface list member
add interface=bridge list=LAN
add interface=ether1 list=WAN
/ip address
add address=192.168.1.1/24 interface=bridge network=192.168.1.0
add address=*** interface=ether1 network=***
add address=10.1.20.100/24 interface=ether1 network=10.1.20.0
/ip dhcp-client
add comment=defconf disabled=no interface=ether1
/ip dhcp-server network
add address=192.168.1.0/24 comment=defconf domain=lan.local gateway=192.168.1.1
/ip dns
set allow-remote-requests=yes servers=8.8.8.8,208.67.222.222,8.8.4.4,208.67.220.220
/ip dns static
add address=192.168.1.1 comment=defconf name=router.local.lan
/ip firewall nat
add action=masquerade chain=srcnat ipsec-policy=out,none out-interface-list=WAN
add action=src-nat chain=srcnat dst-address=10.1.20.1 to-addresses=10.1.20.100
/ip firewall service-port
set ftp disabled=yes
set tftp disabled=yes
set irc disabled=yes
set h323 disabled=yes
set pptp disabled=yes
set udplite disabled=yes
set dccp disabled=yes
set sctp disabled=yes
/ip route
add distance=1 gateway=*** pref-src=*** scope=10
/ip service
set telnet disabled=yes
set ftp disabled=yes
set ssh disabled=yes
set www-ssl disabled=no
set api disabled=yes
set api-ssl disabled=yes
/system clock
set time-zone-name=Europe/Rome
/tool mac-server
set allowed-interface-list=LAN
/tool mac-server mac-winbox
set allowed-interface-list=LAN
Thank you!