NDK UDP application send buffer size must be < 1472?

In Ethernet There is a Maximum Transmission Unit (MTU) =1500. So you can't send in one frame more data than MTU .
But in 1Gb ehternet there are a JUMBO frames  which can be greater  than 1500.

Hi Sergey Manuhin,

I know that Ethernet MTU is 1514.

In other TCP/IP protocol stack implementation(such as Linux, windows, lwip) , Application layer can send maximum 32768 bytes in one udp packet and IP layer do the fragmentation automatically.

so I think it is the limitation of NDK.

Jianguo

1.In linux or Windows big frame will be sent like some frames with length MTU. When you send big Ethernet buffer, your big buffer will be sent like several small packet.
NDK don't do it.
2. Try to see this function:
     setsockopt(socket, SOL_SOCKET, SO_SNDBUF, &buffer_size, sizeof(int) );

Hi sergey manuhin,

I've already tested the setsockopt and SO_SNDBUF, there is no use

Jianguo