Intercom Between two networks

Installing and Using OpenWrt Network and Wireless Configuration
3

It didn't work! I add this parts into my firewall:

config zone
	option name 'LAN2_LAN'
	option input 'ACCEPT'
	option forward 'ACCEPT'
	option network 'LAN2_LAN WGLOCAL'
	option output 'ACCEPT'

config forwarding
	option dest 'lan'
	option src 'LAN2_LAN'

config forwarding
	option dest 'LAN2_LAN'
	option src 'lan'

Should I add an static route or something like that? because it is two separate network that want to communicate each other.(As you said before in another of my topics here)