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Purpose:
to receive UDP unicast packets sent to a single port in two different processes.
System: Linux, Language: C
I am able to bind two sockets in two different processes to the same port using SO_REUSEADDR. But, as expected, the packets are received in only one(the one bound later).
Is it possible to receive packets in both the processes? If not, how is tcpdump able to read but not consume packets.
Why unicast? This is exactly what multicast is for.
To answer you second question –
tcpdumpgets a copy of each packet it listens to via something calledbpf, and that has to be explicitly supported by the network card driver.