Disable wifi network internet access

Installing and Using OpenWrt Network and Wireless Configuration
1

Hi to all,

I have several wifi networks at home openwrt. I need to disable the internet access to one of them, make it accessible and have access only from LAN, how to do that;

config wifi-iface 'wifinet4'
	option ssid 'CamLEDE'
	option encryption 'psk2'
	option device 'radio1'
	option mode 'ap'
	option network 'lan'
	option key xxx
2