Help! Could not send telegram (UDP, LWIP)

Hello,

My system C6743 + TLK110, RMII mode.

I've got link with TLK110, but I have trouble with UDP communication.

I don't use BIOS but use LWIP which is included in Start Ware. No system.

I can't send or receive UDP.

I changed very few.

This LWIP never answered at ARP request form connected PC.

Somebody help me. where do I start?

I can see the RXD0, RXD1, CRS signal from TLK110, at every time Connected PC sent anything.

but I can only see TXEN, TXD0, TXD1 at the lwIPInit(...) function running. after one tx interrupt occur, no more TXEX, TXD0, TXD1 signal generated.

Help, please.