I don't have experience with ethernet packets bigger than1514 bytes, but
I think the main limitations are:
- netif->mtu (you have to set this when initializing the netif)
- TCP_MSS (as you already have discovered)
- IP fragmentation: either turn it off (define IP_FRAG to 0) or set
IP_FRAG_MAX_MTU higher than its default (1500)
there may be more though...
Simon
Gary Olson wrote:
Hi,
I am working with Xilinx EDK and LWIP I think it is version 1.2. I
am able to use the uecho test to send UDP packets less that length
1460 bytes or so.
But when I try to increase the UDP Packet length to 2000 it fails.
My desire is to at least be able to send packets that are
2500 bytes in length. This is because I am trying to send a whole
packet of data with the length of one packet to be about 2020 bytes
maximum.
I tried increasing the TCP_MSS value from 1460 to 3000 (in the lwip
software settings). This did not make it work however.
Does anyone know what I can do to send larger packets using LWIP.
Thank You,
Gary Olson
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