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Linux TCP So_reuseport: Usage and Implementation
O_REUSEPORT socket option. By Krishna Kumar HAProxy and NGINX are some of the few applications that use the TCP SO_REUSEPORT socket option of the Linux networking stack.
This option, initially introduced in 4.4 BSD, is used to implement high-performance servers that help better utilize today's large multicore systems. Source IP address and port: these are usually set by the kernel when the application calls connect() without a prior invocation to bind(). His other interests are playing chess, struggling to learn to use apps, and occasionally bringing stray puppies home much to his wife's consternation.
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