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TCP keep alive works by re-sending the previous ack, even though no more data has been received. There is normally no response for ack packets with no data, but for keep-alives servers respond by also re-sending the previous ack. github.com/wireshark/wireshark

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This is the Mastodon server used by @h2g2bob. Most posts are public, take a look around. Why not take a look at dbatley.com for other interesting stuff.