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I have made a little research on the topic and the problems lies in the network devices.

Layer 2 switches simply cannot do ip fragmentation and obviously they cannot send icmp errors because of...

Yes, the datagram size is 2020 bytes, because I'm just sending random datagrams of 2020 bytes for now.

The Path MTU discovery should work as advertised. When I send a datagram, the first device...

I have posted the code. From the code you can see I'm setting the DF bit to 1 on purpose, because I want the network say me what the minimum MTU is.

This way I can dynamically choose the best...

#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <string.h>

// la...

Hi, I'm developing a tftp client and server and I want to dynamically select the
udp payload size to boost transfer performance.

I have tested it with two linux machines ( one has a gigabit...