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I am developing a protocol over UDP to be used in a local network, there will be only a switch (cisco, 3com, etc) between source and destination, both Linux systems, same MTU.
How often should I expect udp packets to be duplicated (obviously not by me but by the switch or maybe the server) at the destination in this case? I need this to know if to implement a duplication check in my code or not.
Switches will send packets to all interfaces when using broadcasts or under extreme conditions (full MAC Address Table). This can lead to duplication if there is a loop between two or more switches and if the Spanning Tree Protocol is not used. So the answer is rarely.