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You are probably thinking about when IPX was tunnelled over TCP/IP. Which unsurprisingly didn't last long.
– andygavin
Commented Jul 17, 2012 at 17:25
1

tools.ietf.org/html/rfc1791
– GDR
Commented Jul 18, 2012 at 16:04
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And as well, there was TCP over TokenRing, TCP over X25, even if they have fallend out of use; TCP over parallel ports or serial links are still used. Now there's also TCP over USB, TCP over Bluetooth, TCP over HDMI or DisplayPort, TCP over management bus channels used by some firmwares, and even TCP over SCSI! TCP is very versatile!
– verdy_p
Commented Aug 8, 2022 at 20:04

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