The default IP@ of the LAN ports of a LEDE device is 192.168.1.1 if the addresses of the devices in the network you connect to the WAN port are 192.168.1.X (X=any number) you need to change the IP@ of the LAN interfaces your LEDE router to 192.168.2.1 or to something that isn’t 192.168.1.X
# uci set network.lan.ipaddr=’new-ip-address‘
# uci commit && service network restart
UCI (Unified Configuration Interface) – Technical Reference