Hi! On 15:12 Tue 26 Jan , Oliver Graute wrote:
Some UDP packets send via the loopback interface are dropped in the kernel on the receive side when using sendto with the MSG_MORE flag. Every drop increases the InCsumErrors in /proc/self/net/snmp. Some example code to reproduce it is appended below.
In the code we tracked it down to this code section. ( Even a little further but its unclear to me wy the csum() is wrong in the bad case)
I think it is unlikely that the error is on the receiving side. I recommend to capture the data that is being sent with a sniffer and see if there is anything wrong. You may also want to try disabling hardware acceleration on your network devices, because the checksum is sometimes done in hardware. -Michi -- programing a layer 3+4 network protocol for mesh networks see http://michaelblizek.twilightparadox.com