I have set up everything as you suggested. Thanks a lot!!! If this can help to somebody other:
The last question: are the First issued IP and Last issued IP set-up ok like this on main router (see below)?
Main router settings:
Wirelless:Channel: 1
SSID: Network 1
Transition mode: Mixed
LANIP Address: 192.168.1.1
Subnet mask: 255.255.255.0
First issued IP address: 192.168.1.100
Last issued IP address: 192.168.1.253
Default gateway: 192.168.1.1
DHCP Server: On
DAP-1360 settings:
Wireless:Mode: Access Pint:
SSID: Network 2
Channel: 11
LAN:LAN Connection: Static IP (disable DHCP)
IP Address: 192.168.1.50
Subnet mask: 255.255.255.0
Gateway Address 192.168.1.1
Thanks a lot for your help!!!