Starting with SW 1.10, LK4 uses DHCP to obtain an IP address by default. Please remember that it will try to obtain the address from the DHCP server until it succeeds. This means that if there is no DHCP server in the network, LK4 will be unreachable.
Up to and including SW 1.08, LK4 uses the static IP address 192.168.1.100 by default.