![]() Witness: # netstat -p tcpĪfter a few seconds the very same command yields zilch: # netstat -p tcp ![]() And in an effort to save power, the Air drops any unused connections after 5 seconds. To hardwire one to a network, a USBEthernet transceiver must be added on. However, the MacBook Air has no built-in ethernet. Proto Recv-Q Send-Q Local Address Foreign Address (state) On desktops, TCP connections are maintained, even in a “CLOSE_WAIT” state: (IP addresses changed to protect the guilty) # netstat -p tcp You can rely on en0 existing and the connection being stable. ![]() ![]() Obtaining the IP address on a desktop Mac with built-in ethernet ports is relatively straightforward.
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