UDP Server Socket Buffer Overflow

Question

I am writing a C++ application on Linux. My application has a UDP server which sends data to clients on some events. The UDP server also receives some feedback/acknowledgement

Answer 1

You can see the maximum allowed buffer size:

sysctl net.core.rmem_max

You can set the maximum buffer size you can use by:

sysctl -w net.core.rmem_max=8388608

You can also set the buffer size at run-time (not exceeding the max above) by using setsockopt and changing SO_RCVBUF. You can see the buffer level by looking at /proc/net/udp.

The buffer is used to store the UDP header and application data, rest belong to lower levels.