Unexpected TCP Client Self-Connection Phenomenon Explained
By
Bogdanp
The bagel they save for the regulars. Don't skim, savour.
Summary
The article describes an unexpected but technically valid behavior where a TCP client can connect to itself under specific conditions. The author shares a Bourne shell code snippet demonstrating this phenomenon, where repeated attempts to connect to a local port eventually succeed, echoing back input.
Key quotes
· 2 pulledThis is so cool and unexpected, but then nothing out of spec, that I had to reblog it.
You'll constantly receive message 'Connection refused', but at one point the connection will be established and whatever you type, will be echoed back.
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