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Set IP_BIND_ADDRESS_NO_PORT on outbound tcp sockets by crrodriguez · Pull Request #668 · NLnetLabs/unbound · GitHub
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Set IP_BIND_ADDRESS_NO_PORT on outbound tcp sockets #668
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When bound to a local address the kernel does not know if the socket will listen() or connect() and must reserve a port inmediately after bind() effectively limiting the random port range to ~32k. when IP_BIND_ADDRESS_NO_PORT is set, the kernel delays source port allocation until the time the complete 4-tuple is known allowing a much larger number of combinations
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Thanks for this! I relocated and made the code more portable. |
ok, I noticed the code already needs c99 so i didnt bothered with the c89 version. |
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When bound to a local address the kernel does not know if the socket
will listen() or connect() and must reserve a port inmediately after
bind() effectively limiting the random port range to ~32k.
when IP_BIND_ADDRESS_NO_PORT is set, the kernel delays source port
allocation until the time the complete 4-tuple is known allowing
a much larger number of combinations