To find the LAN IP address, open a shell and run:
/sbin/ifconfig
Look for the inet addr in the output, which will look like below:
eth0 Link encap:Ethernet HWaddr 00:22:19:84:9B:E8
inet addr:192.168.1.89 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: fe80::222:19ff:fe84:9be8/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:8380921 errors:0 dropped:0 overruns:0 frame:0
TX packets:8360250 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:806377947 (769.0 MiB) TX bytes:752649055 (717.7 MiB)
Interrupt:169 Memory:f8000000-f8012100