The descriptions you have given leave too many possibilities. Ethernet is very complex. There are a zillion potential issues between the driver, the lwIP configuration, options, and potential RTOS. Not much anyone can do for you without a lot more details on what your setup is and some debugging data.
For example, do you have a console/uart setup to output DEBUG strings? You really need that. Without that you are blind. lwIP has a lot of stats and debug info that will help you figure out what is going on inside lwIP. You will need to get fully aquainted with the debug facilities of lwIP. You mentioned before setting your pbuf size to 256 bytes. What is the size of your driver/DMA/MAC buffers? They should probably be set the same to 256 bytes. Depending on how the driver is writtem, it may or may not support mixed sizes and full fragmentation. Just the driver alone is a really big Black Box full of potential headaches. Troubleshooting skills here are a really big plus. Getting lwIP up and running is not trivial. You have to start at the bottom and build your way up from there. I found it hard to get very far on this kind of code until I developed enough understanding of what makes Ethernet tic from top to bottom. There is a learning curve. You may be on this longer than you expected. I sure have been. Hope this helps. Chris.
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