DHCP Timed Out problem in simple socket server

The following can help you better understanding where the problem is.

Browse the Nios sw library and locate the file ipnet.c. It should be in:

<altera_directory>\nios2eds\components\altera_iniche\UCOSII\src\ip

Look for the pktdemux() function and place a breakpoint here.

Compile the whole project and bsp in debug mode and start a debug session.

Your code should hit the breakpoint whenever an ethernet packet is received.

At this point you can follow the execution and find out where it fails.

For a ping packet, the flow should lead to the entry: case ARPTP

If pktdemux is not reached at all, you have a problem at a lower level.

Are you using tse, isn't it? Then you can place a breakpoint in tse_mac_rcv()

(file ins_tse_mac.c) and check if execution at least gets here.

Another good method is using tse_mac_raw_send() to manually transmit a packet and check if it's actually transmitted, using any network analyzer program (i.e. WireShark)