LwIP + FreeRTOS + Zynq zc702 - erroneous data byte offset when sending UDP from Zynq

Hello,
I'm sending UDP successfully from my zc702 board to a PC. However if I send UDP datagrams larger than the Ethernet MTU, thus requiring lwIP to fragment my UDP datagram into multiple Ethernet frames, I get a mysterious data offset in received data seen in Wireshark. The offset is either 8,16,24,32,40,48, or 56 bytes (8 byte increments). The offset changes whenver I change code - even unrelated code in other FreeRTOS threads, but the offset is always one of those numbers. For now as a hack I'm adding the required offset to the data payload pointer I pass to the lwip_sendto() function, which works until I change any code, then I have to use a different offset.
I've increased stack and heap size but no effect. Again, it only happens when I send > Ethernet MTU (around 1500) bytes.
Has anyone seen this behaviour?
Thanks,
Randy

This reply is coming extremely late, so this is for the benefit of anyone else who is having a problem with IP fragmentation. I was able to fix this by modifying the pbuf.c file in the lwip140_v1_06_a source code. Just remove the call to the LWIP_MEM_ALIGN macro on line 379 -- delete the call but leave the rest of the line alone. It was starting each new fragment at a 64-byte aligned location. This caused the second fragment to start at the wrong location which then caused all of the other fragments to start at the wrong location. I think what they meant to do was to align the first fragment but leave the rest alone.

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