I just bought a new WIZwiki-W7500P to evaluate it for a new design. I unpacked it and connected via USB to my laptop. Trough the serial port reports everything as it should, including its IP:
[DEBUG] CID / PNM : …
MAC ADDRESS : 00:08:DC:01:02:03
IP ADDRESS : 192.168.77.9
GW ADDRESS : 192.168.77.1
SN MASK: 255.255.255.0
0:Listen, TCP server loopback, port 
I connected the Ethernet port to my laptop, and set it to an IP in the same subnet (192.168.77.10). RJ45 Green light is solid and the Yellow is blinking, but the board doesn’t respond to Ping or anything else that I do. I even checked with Wireshark and the ARP packets are going out trough the interface but I get no response from the WIZNET board.
Has anyone had that problem before?